21

Obiettivo:Creazione di una vista un'immagine drawable & stradale in Android

Creare un imageview che è disegnabile stradale,

Ciò significa che quando si preme un pulsante per il, è disegnabile,

o quando si spegne, che è zoomabile.

* Si noti disegni dovrebbero diminuire allinearsi con la imageview

================================ ===============================

Recentemente ho scritto una visualizzazione dell'immagine drawable personalizzato come questo:

public class DrawView extends ImageView { 

     private int color = Color.BLACK; 
     private float width = 4f; 
     private List<Holder> holderList = new ArrayList<Holder>(); 

     private class Holder {  
      Path path; 
      Paint paint; 

      Holder(int color, float width) { 
       path = new Path(); 
       paint = new Paint(); 
       paint.setAntiAlias(true); 
       paint.setStrokeWidth(width); 
       paint.setColor(color); 
       paint.setStyle(Paint.Style.STROKE); 
       paint.setStrokeJoin(Paint.Join.ROUND); 
       paint.setStrokeCap(Paint.Cap.ROUND); 
      } 
     } 

     public DrawView(Context context) { 
      super(context); 
      init(); 
     } 

     public DrawView(Context context, AttributeSet attrs) { 
      super(context, attrs); 
      init(); 
     } 

     public DrawView(Context context, AttributeSet attrs, int defStyle) { 
      super(context, attrs, defStyle); 
      init(); 
     } 

     private void init() { 
      holderList.add(new Holder(color, width)); 
     } 

     @Override 
     protected void onDraw(Canvas canvas) { 
      super.onDraw(canvas); 
      for (Holder holder : holderList) { 
       canvas.drawPath(holder.path, holder.paint); 
      } 
     } 

     @Override 
     public boolean onTouchEvent(MotionEvent event) { 
      float eventX = event.getX(); 
      float eventY = event.getY(); 

      switch (event.getAction()) { 
       case MotionEvent.ACTION_DOWN: 
        holderList.add(new Holder(color,width)); 
        holderList.get(holderList.size() - 1).path.moveTo(eventX, eventY); 
        return true; 
       case MotionEvent.ACTION_MOVE: 
        holderList.get(holderList.size() - 1).path.lineTo(eventX, eventY); 
        break; 
       case MotionEvent.ACTION_UP: 
        break; 
       default: 
        return false; 
      } 

      invalidate(); 
      return true; 
     } 

     public void resetPaths() { 
      for (Holder holder : holderList) { 
       holder.path.reset(); 
      } 
      invalidate(); 
     } 

     public void setBrushColor(int color) { 
      this.color = color; 
     } 

     public void setWidth(float width) { 
      this.width = width; 
     } 
    } 

E l'XML è:

<com.example.tool.DrawView 
    android:id="@+id/draw" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:adjustViewBounds="true" /> 

il prob lem is, come renderlo zoomabile anche a? si noti che i disegni devono essere allineati con la visualizzazione di immagini durante lo zoom.

Tentativo di utilizzare una libreria di immagini personalizzate ma senza fortuna.

ad es. Quando uso PhotoView che può essere zoom, ma i disegni non allinearsi, e il livello di zoom ritorna dopo aver attivare/disattivare lo zoom https://github.com/chrisbanes/PhotoView

Inoltre, trovare qualche altra libreria del genere, ma non montare il caso visualizzazione personalizzata https://github.com/matabii/scale-imageview-android

enter image description here

Update1: demo

consigliato di fare riferimento a questa applicazione, la funzione di disegno è in realtà lo stesso di quello che ho Sto lottando per raggiungere, ma non riesco a capire come farlo fare

https://play.google.com/store/apps/details?id=com.zentertain.photoeditor&hl=en

Grazie

Update2: Da Sandeep Maram Fonte

Grazie mille Sandeep Maram, dopo testando il codice, tutto funziona bene, l'unica cosa che rimane è che i disegni non sono allineati con la vista zoom. Si prega di dare un'occhiata alla schermata

Prima: enter image description here

Dopo:

enter image description here

Il cerchio non è scalare su/giù quando lo zoom, sarebbe davvero bello se sistemare le cose. anche questo non importa se l'immagine si sovrappone al pulsante.

+1

come zoom applicare per la vista, mostrami il codice? –

+1

è facile: non utilizzare un ** personalizzato ImageView **, utilizzare un ** personalizzato Drawable **, quindi passare Drawable a 'ImageView.setImageDrawable()' – pskink

+0

aggiornato, grazie – user3538235

risposta

5

risposta aggiornato con zoom attivare/disattivare e drawableview

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context=".MainActivity" > 
<Button 
    android:id="@+id/enable_zoom" 
    android:layout_height="wrap_content" 
    android:layout_width="wrap_content" 
    android:text="disable zoom"/> 

<com.rbt.zoomdraw.CustomImageView 
    android:id="@+id/zoom_iv" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:src="@drawable/ic_launcher" 
    android:layout_below="@+id/enable_zoom" /> 

<com.rbt.zoomdraw.DrawableView 
    android:id="@+id/drawble_view" 
    android:layout_width="wrap_content" 
    android:layout_height="match_parent" 
    android:layout_alignBottom="@+id/zoom_iv" 
    android:layout_alignTop="@+id/zoom_iv" /> 

MainActivity.java

public class MainActivity extends Activity implements OnClickListener { 

private Button enableZoomBtn; 
private DrawableView drawbleView; 
private CustomImageView touchImageView; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    drawbleView = (DrawableView) findViewById(R.id.drawble_view); 
    enableZoomBtn = (Button) findViewById(R.id.enable_zoom); 
    touchImageView = (CustomImageView) findViewById(R.id.zoom_iv); 
    enableZoomBtn.setOnClickListener(this); 
    drawbleView.setDrawingEnabled(false); 
} 
@Override 
public void onClick(View v) { 
    int id = v.getId(); 
    switch (id) { 
    case R.id.enable_zoom: 
     if(enableZoomBtn.getText().equals("disable zoom")){ 
      touchImageView.setZoomEnable(false); 
      drawbleView.setDrawingEnabled(true); 
      enableZoomBtn.setText("enable zoom"); 
     } else{ 
      touchImageView.setZoomEnable(true); 
      drawbleView.setDrawingEnabled(false); 
      enableZoomBtn.setText("disable zoom"); 
     } 
     break; 

    default: 
     break; 
    } 
    } 
} 

DrawableView.java

public class DrawableView extends View { 
public int width; 
public int height; 
private boolean isEditable; 
private Path drawPath; 
private Paint drawPaint; 
private Paint canvasPaint; 
private Canvas drawCanvas; 
private Bitmap canvasBitmap; 
private int paintColor = Color.RED; 
public DrawableView(Context context) { 
    super(context); 
} 
public DrawableView(Context context, AttributeSet attrs) { 
    super(context, attrs); 
    this.canvasPaint = new Paint(Paint.DITHER_FLAG); 
    setupDrawing(); 
} 
public DrawableView(Context context, AttributeSet attrs, int defStyleAttr) { 
    super(context, attrs, defStyleAttr); 
} 
@Override 
protected void onSizeChanged(int w, int h, int oldw, int oldh) { 
    super.onSizeChanged(w, h, oldw, oldh); 
    this.height = h; 
    this.width = w; 
    canvasBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); 
    drawCanvas = new Canvas(canvasBitmap); 
} 
private void setupDrawing() { 
    drawPath = new Path(); 
    drawPaint = new Paint(); 
    drawPaint.setColor(paintColor); 
    drawPaint.setAntiAlias(true); 
    drawPaint.setDither(true); 
    drawPaint.setStyle(Paint.Style.STROKE); 
    drawPaint.setStrokeJoin(Paint.Join.ROUND); 
    drawPaint.setStrokeCap(Paint.Cap.ROUND); 
    drawPaint.setStrokeWidth(10); 
} 
public void setDrawingEnabled(boolean isEditable){ 
    this.isEditable = isEditable; 
} 
@Override 
protected void onDraw(Canvas canvas) { 
    super.onDraw(canvas); 
    canvas.drawBitmap(canvasBitmap, 0, 0, canvasPaint); 
    canvas.drawPath(drawPath, drawPaint); 
} 

@Override 
public boolean onTouchEvent(MotionEvent event) { 
    if(isEditable){ 
     float touchX = event.getX(); 
     float touchY = event.getY(); 
     switch (event.getAction()) { 
     case MotionEvent.ACTION_DOWN: 
      drawPath.moveTo(touchX, touchY); 
      break; 
     case MotionEvent.ACTION_MOVE: 
      drawPath.lineTo(touchX, touchY); 
      break; 
     case MotionEvent.ACTION_UP: 
      drawPath.lineTo(touchX, touchY); 
      drawCanvas.drawPath(drawPath, drawPaint); 
      drawPath = new Path(); 
      break; 
     default: 
      return false; 
     } 
    } else{ 
     return false; 
    } 
    invalidate(); 
    return true; 
    } 
} 

CustomImageView

public class CustomImageView extends ImageView { 
Matrix matrix; 
// We can be in one of these 3 states 
static final int NONE = 0; 
static final int DRAG = 1; 
static final int ZOOM = 2; 
int mode = NONE; 
private boolean zoomEnable= true; 
// Remember some things for zooming 
PointF last = new PointF(); 
PointF start = new PointF(); 
float minScale = 1f; 
float maxScale = 5f; 
float[] m; 

int viewWidth, viewHeight; 
static final int CLICK = 3; 
float saveScale = 1f; 
protected float origWidth, origHeight; 
int oldMeasuredWidth, oldMeasuredHeight; 
ScaleGestureDetector mScaleDetector; 
Context context; 
public CustomImageView(Context context) { 
    super(context); 
    sharedConstructing(context); 
} 
public void setZoomEnable(boolean status){ 
    zoomEnable = status; 
} 
public CustomImageView(Context context, AttributeSet attrs) { 
    super(context, attrs); 
    sharedConstructing(context); 
} 

private void sharedConstructing(Context context) { 
    super.setClickable(true); 
    this.context = context; 
    mScaleDetector = new ScaleGestureDetector(context, new ScaleListener()); 
    matrix = new Matrix(); 
    m = new float[9]; 
    setImageMatrix(matrix); 
    setScaleType(ScaleType.MATRIX); 

    setOnTouchListener(new OnTouchListener() { 
     @Override 
     public boolean onTouch(View v, MotionEvent event) { 
      if(zoomEnable){ 
       mScaleDetector.onTouchEvent(event); 
       PointF curr = new PointF(event.getX(), event.getY()); 

       switch (event.getAction()) { 
       case MotionEvent.ACTION_DOWN: 
        last.set(curr); 
        start.set(last); 
        mode = DRAG; 
        break; 

       case MotionEvent.ACTION_MOVE: 
        if (mode == DRAG) { 
         float deltaX = curr.x - last.x; 
         float deltaY = curr.y - last.y; 
         float fixTransX = getFixDragTrans(deltaX, viewWidth, 
           origWidth * saveScale); 
         float fixTransY = getFixDragTrans(deltaY, viewHeight, 
           origHeight * saveScale); 
         matrix.postTranslate(fixTransX, fixTransY); 
         fixTrans(); 
         last.set(curr.x, curr.y); 
        } 
        break; 

       case MotionEvent.ACTION_UP: 
        mode = NONE; 
        int xDiff = (int) Math.abs(curr.x - start.x); 
        int yDiff = (int) Math.abs(curr.y - start.y); 
        if (xDiff < CLICK && yDiff < CLICK) 
         performClick(); 
        break; 

       case MotionEvent.ACTION_POINTER_UP: 
        mode = NONE; 
        break; 
       } 

       setImageMatrix(matrix); 
       invalidate(); 
       return true; // indicate event was handled 

      } else{ 
       return false; 
      } 
     } 

    }); 
} 

public void setMaxZoom(float x) { 
    maxScale = x; 
} 

private class ScaleListener extends 
ScaleGestureDetector.SimpleOnScaleGestureListener { 
    @Override 
    public boolean onScaleBegin(ScaleGestureDetector detector) { 
     mode = ZOOM; 
     return true; 
    } 

    @Override 
    public boolean onScale(ScaleGestureDetector detector) { 
     float mScaleFactor = detector.getScaleFactor(); 
     float origScale = saveScale; 
     saveScale *= mScaleFactor; 
     if (saveScale > maxScale) { 
      saveScale = maxScale; 
      mScaleFactor = maxScale/origScale; 
     } else if (saveScale < minScale) { 
      saveScale = minScale; 
      mScaleFactor = minScale/origScale; 
     } 

     if (origWidth * saveScale <= viewWidth 
       || origHeight * saveScale <= viewHeight) 
      matrix.postScale(mScaleFactor, mScaleFactor, viewWidth/2, 
        viewHeight/2); 
     else 
      matrix.postScale(mScaleFactor, mScaleFactor, 
        detector.getFocusX(), detector.getFocusY()); 

     fixTrans(); 
     return true; 
    } 
} 

void fixTrans() { 
    matrix.getValues(m); 
    float transX = m[Matrix.MTRANS_X]; 
    float transY = m[Matrix.MTRANS_Y]; 

    float fixTransX = getFixTrans(transX, viewWidth, origWidth * saveScale); 
    float fixTransY = getFixTrans(transY, viewHeight, origHeight 
      * saveScale); 

    if (fixTransX != 0 || fixTransY != 0) 
     matrix.postTranslate(fixTransX, fixTransY); 
} 

float getFixTrans(float trans, float viewSize, float contentSize) { 
    float minTrans, maxTrans; 

    if (contentSize <= viewSize) { 
     minTrans = 0; 
     maxTrans = viewSize - contentSize; 
    } else { 
     minTrans = viewSize - contentSize; 
     maxTrans = 0; 
    } 

    if (trans < minTrans) 
     return -trans + minTrans; 
    if (trans > maxTrans) 
     return -trans + maxTrans; 
    return 0; 
} 

float getFixDragTrans(float delta, float viewSize, float contentSize) { 
    if (contentSize <= viewSize) { 
     return 0; 
    } 
    return delta; 
} 

@Override 
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
    super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
    viewWidth = MeasureSpec.getSize(widthMeasureSpec); 
    viewHeight = MeasureSpec.getSize(heightMeasureSpec); 

    // 
    // Rescales image on rotation 
    // 
    if (oldMeasuredHeight == viewWidth && oldMeasuredHeight == viewHeight 
      || viewWidth == 0 || viewHeight == 0) 
     return; 
    oldMeasuredHeight = viewHeight; 
    oldMeasuredWidth = viewWidth; 

    if (saveScale == 1) { 
     // Fit to screen. 
     float scale; 

     Drawable drawable = getDrawable(); 
     if (drawable == null || drawable.getIntrinsicWidth() == 0 
       || drawable.getIntrinsicHeight() == 0) 
      return; 
     int bmWidth = drawable.getIntrinsicWidth(); 
     int bmHeight = drawable.getIntrinsicHeight(); 

     Log.d("bmSize", "bmWidth: " + bmWidth + " bmHeight : " + bmHeight); 

     float scaleX = (float) viewWidth/(float) bmWidth; 
     float scaleY = (float) viewHeight/(float) bmHeight; 
     scale = Math.min(scaleX, scaleY); 
     matrix.setScale(scale, scale); 

     // Center the image 
     float redundantYSpace = (float) viewHeight 
       - (scale * (float) bmHeight); 
     float redundantXSpace = (float) viewWidth 
       - (scale * (float) bmWidth); 
     redundantYSpace /= (float) 2; 
     redundantXSpace /= (float) 2; 

     matrix.postTranslate(redundantXSpace, redundantYSpace); 

     origWidth = viewWidth - 2 * redundantXSpace; 
     origHeight = viewHeight - 2 * redundantYSpace; 
     setImageMatrix(matrix); 
    } 
    fixTrans(); 
    } 
} 

spero che lavorerà per voi.

+0

ti dispiacerebbe spiegare brevemente come usarlo? sembra non funzionare per disabilitare/abilitare lo zoom. e per attingere tutto ciò che devo fare è usare il mio codice implementato? Grazie per l'aiuto. – user3538235

+0

Il mio suggerimento è di prendere un'altra classe personalizzata che estende la vista. Esegui operazioni disegnabili su questa vista. Metti questa vista come allineato e allineato alla vista dell'immagine che è zoomabile. Penso che sia un allenamento per te. – sandeepmaaram

+0

Provato usando la vista e sembra per lo zoom. Ciò significa che ci sono due livelli, uno per disegnare e uno per lo zoom? ti dispiacerebbe avere qualche codice puseduo per la spiegazione? Grazie mille – user3538235

2

Non ho una soluzione completa. Tuttavia posso consigliarti di dare un'occhiata a PhotoView che ha l'implementazione dello zoom e il mio custom CanvasView che ho usato in uno dei vecchi progetti. Permette di disegnare usando lo strumento "penna" e digita il testo su di esso. La funzione di testo non è necessaria per te e probabilmente era troppo specifica per quella parte in modo da poterla saltare. Forse ti aiuterà. Supporta la rotazione dello schermo che porta a nuove dimensioni disegnabili e in questo caso sia il testo che le curve vengono ridimensionati.

public class CanvasView extends View { 

    // ----------------------------------------------------------------------- 
    // 
    // Constants 
    // 
    // ----------------------------------------------------------------------- 
    @SuppressWarnings("unused") 
    private static final String TAG = CanvasView.class.getSimpleName(); 

    private static final String EXTRA_SUPER_STATE = "EXTRA_SUPER_STATE"; 
    private static final String EXTRA_COLOR = "EXTRA_COLOR"; 
    private static final String EXTRA_ACTION = "EXTRA_ACTION"; 
    private static final String EXTRA_MODIFICATIONS = "EXTRA_MODIFICATIONS"; 
    private static final String EXTRA_CURRENT_MODIFICATION = "EXTRA_CURRENT_MODIFICATION"; 

    // ----------------------------------------------------------------------- 
    // 
    // Enums 
    // 
    // ----------------------------------------------------------------------- 
    public static enum ACTION { 
     PEN, TEXT 
    }; 

    // ----------------------------------------------------------------------- 
    // 
    // Fields 
    // 
    // ----------------------------------------------------------------------- 
    private ArrayList<DrawableItem> mItems; 
    private ACTION mAction; 
    private int mColor; 
    private float mDensityScale; 

    private DrawableItem mCurrentItem; 

    private EditText mEditText; 

    // ----------------------------------------------------------------------- 
    // 
    // Constructor 
    // 
    // ----------------------------------------------------------------------- 
    public CanvasView(Context context, AttributeSet attrs) { 
     super(context, attrs); 
     mItems = new ArrayList<CanvasView.DrawableItem>(); 
     mAction = ACTION.PEN; 
     mDensityScale = getResources().getDisplayMetrics().density; 
    } 

    // ----------------------------------------------------------------------- 
    // 
    // Setters 
    // 
    // ----------------------------------------------------------------------- 
    public void setAction(ACTION action) { 
     if (mCurrentItem != null) 
      saveCurrentModification(); 
     mAction = action; 
     invalidate(); 
    } 

    public void setColor(int color) { 
     mColor = color; 
     hideKeyboard(); 
    } 

    public void saveCurrentModification() { 
     if (mCurrentItem instanceof Curve || !((Text) mCurrentItem).isEmpty()) 
      mItems.add(mCurrentItem); 

     mCurrentItem = null; 
    } 

    // ----------------------------------------------------------------------- 
    // 
    // Methods 
    // 
    // ----------------------------------------------------------------------- 
    @Override 
    protected void onDraw(Canvas canvas) { 
     super.onDraw(canvas); 
     for (DrawableItem item : mItems) 
      item.draw(canvas, getMeasuredWidth(), getMeasuredHeight()); 
     if (mCurrentItem != null) 
      mCurrentItem.draw(canvas, getMeasuredWidth(), getMeasuredHeight()); 
    } 

    @Override 
    public boolean onTouchEvent(MotionEvent event) { 
     switch (mAction) { 
     case PEN: 
      onTouchPen(event); 
      break; 
     case TEXT: 
      onTouchText(event); 
      break; 
     default: 
      break; 
     } 
     return true; 

    } 

    private void onTouchPen(MotionEvent event) { 
     switch (event.getActionMasked()) { 
     case MotionEvent.ACTION_DOWN: 
      mCurrentItem = new Curve(mColor); 
      break; 
     case MotionEvent.ACTION_MOVE: 
      Curve currentItem = (Curve) mCurrentItem; 
      currentItem.addPoint(event.getX(), event.getY()); 
      break; 
     case MotionEvent.ACTION_UP: 
     case MotionEvent.ACTION_CANCEL: 
      saveCurrentModification(); 
      break; 
     default: 
     } 
     invalidate(); 
    } 

    private void onTouchText(MotionEvent event) { 
     switch (event.getActionMasked()) { 
     case MotionEvent.ACTION_DOWN: { 
      if (mCurrentItem != null) 
       saveCurrentModification(); 
      mCurrentItem = new Text(new PointF(event.getX(), event.getY()), 
        mDensityScale); 
      showKeyboard(); 
     } 
      break; 
     default: 
     } 
    } 

    private void showKeyboard() { 
     mEditText.setVisibility(View.VISIBLE); 
     mEditText.setText(""); 
     mEditText.requestFocus(); 
     InputMethodManager inputMethodManager = (InputMethodManager) getContext() 
       .getSystemService(Context.INPUT_METHOD_SERVICE); 
     inputMethodManager.showSoftInput(mEditText, 
       InputMethodManager.SHOW_IMPLICIT); 
    } 

    private void hideKeyboard() { 
     mEditText.setVisibility(View.INVISIBLE); 
     InputMethodManager imm = (InputMethodManager) getContext() 
       .getSystemService(Context.INPUT_METHOD_SERVICE); 
     imm.hideSoftInputFromWindow(mEditText.getWindowToken(), 0); 
    } 

    @Override 
    protected Parcelable onSaveInstanceState() { 
     Bundle bundle = new Bundle(); 
     bundle.putParcelable(EXTRA_SUPER_STATE, super.onSaveInstanceState()); 
     bundle.putInt(EXTRA_COLOR, mColor); 
     bundle.putSerializable(EXTRA_ACTION, mAction); 
     bundle.putParcelableArrayList(EXTRA_MODIFICATIONS, mItems); 
     return bundle; 
    } 

    @Override 
    protected void onRestoreInstanceState(Parcelable state) { 
     if (state instanceof Bundle) { 
      Bundle bundle = (Bundle) state; 
      setColor(bundle.getInt(EXTRA_COLOR)); 
      setAction((ACTION) bundle.getSerializable(EXTRA_ACTION)); 
      mItems = bundle.getParcelableArrayList(EXTRA_MODIFICATIONS); 
      super.onRestoreInstanceState(bundle 
        .getParcelable(EXTRA_SUPER_STATE)); 
      return; 
     } else 
      super.onRestoreInstanceState(state); 
    } 

    public OnEditorActionListener getEditorActionListener() { 
     return mEditorActionListener; 
    } 

    public TextWatcher getTextWatcher() { 
     return mTextWatcher; 
    } 

    public void setTextProvider(EditText editText) { 
     mEditText = editText; 
     mEditText.setOnEditorActionListener(getEditorActionListener()); 
     mEditText.addTextChangedListener(mTextWatcher); 
    } 

    public void clearSession() { 
     mItems.clear(); 
     mCurrentItem = null; 
     hideKeyboard(); 
     invalidate(); 
    } 

    // ----------------------------------------------------------------------- 
    // 
    // Listeners 
    // 
    // ----------------------------------------------------------------------- 
    private OnEditorActionListener mEditorActionListener = new OnEditorActionListener() { 
     public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { 
      if (actionId == EditorInfo.IME_ACTION_DONE) { 
       saveCurrentModification(); 
       hideKeyboard(); 
      } 
      return false; 
     } 
    }; 

    private TextWatcher mTextWatcher = new TextWatcher() { 

     @Override 
     public void onTextChanged(CharSequence s, int start, int before, 
       int count) { 
     } 

     @Override 
     public void beforeTextChanged(CharSequence s, int start, int count, 
       int after) { 
     } 

     @Override 
     public void afterTextChanged(Editable s) { 
      if (mCurrentItem instanceof Text) { 
       ((Text) mCurrentItem).setText(s.toString()); 
       invalidate(); 
      } 
     } 
    }; 

    // ----------------------------------------------------------------------- 
    // 
    // Inner classes 
    // 
    // ----------------------------------------------------------------------- 
    public static interface OnStartTextInputListener { 
     public void onTextInputStarted(CanvasView view); 
    } 

    private static interface DrawableItem extends Parcelable { 
     public void draw(Canvas canvas, float viewWidth, float viewHeight); 
    } 

    private static class Curve implements DrawableItem { 
     // ----------------------------------------------------------------------- 
     // 
     // Fields 
     // 
     // ----------------------------------------------------------------------- 
     private ArrayList<PointF> mPoints; 
     private int mColor; 
     private Paint mPaint; 

     // ----------------------------------------------------------------------- 
     // 
     // Constructor 
     // 
     // ----------------------------------------------------------------------- 
     public Curve(int color) { 
      mPoints = new ArrayList<PointF>(); 
      mColor = color; 
      mPaint = new Paint(); 
      mPaint.setColor(mColor); 
      mPaint.setStrokeWidth(2); 
     } 

     private Curve(Parcel parcel) { 
      mColor = parcel.readInt(); 
      parcel.readList(mPoints, PointF.class.getClassLoader()); 
     } 

     // ----------------------------------------------------------------------- 
     // 
     // Methods 
     // 
     // ----------------------------------------------------------------------- 
     @Override 
     public void draw(Canvas canvas, float viewWidth, float viewHeight) { 
      for (int i = 1; i < mPoints.size(); ++i) { 
       PointF prev = mPoints.get(i - 1); 
       PointF current = mPoints.get(i); 
       canvas.drawLine(prev.x/viewWidth * canvas.getWidth(), prev.y 
         /viewHeight * canvas.getHeight(), current.x 
         /viewWidth * canvas.getWidth(), current.y/viewHeight 
         * canvas.getHeight(), mPaint); 
      } 
     } 

     public void addPoint(float x, float y) { 
      mPoints.add(new PointF(x, y)); 
     } 

     @Override 
     public int describeContents() { 
      return 0; 
     } 

     @Override 
     public void writeToParcel(Parcel dest, int flags) { 
      dest.writeInt(mColor); 
      dest.writeList(mPoints); 
     } 

     // ----------------------------------------------------------------------- 
     // 
     // Inner classes 
     // 
     // ----------------------------------------------------------------------- 
     public static final Parcelable.Creator<Curve> CREATOR = new Parcelable.Creator<Curve>() { 
      public Curve createFromParcel(Parcel in) { 
       return new Curve(in); 
      } 

      public Curve[] newArray(int size) { 
       return new Curve[size]; 
      } 
     }; 
    } 

    private static class Text implements DrawableItem { 
     // ----------------------------------------------------------------------- 
     // 
     // Constatns 
     // 
     // ----------------------------------------------------------------------- 
     private static final int FONT_SIZE = 14; 
     private static final int PADDING = 4; 
     private static final int BORDER_WIDTH = 2; 
     private static final int BORDER_COLOR = Color.rgb(0, 0, 0); 
     private static final int BOX_COLOR = Color.rgb(255, 255, 255); 
     private static final int FONT_COLOR = Color.rgb(0, 0, 0); 

     // ----------------------------------------------------------------------- 
     // 
     // Fields 
     // 
     // ----------------------------------------------------------------------- 
     private Paint mBoxPaint; 
     private Paint mBorderPaint; 
     private Paint mTextPaint; 

     private float mDensityScale; 

     private PointF mPoint; 
     private String mTextString = ""; 

     // ----------------------------------------------------------------------- 
     // 
     // Constructor 
     // 
     // ----------------------------------------------------------------------- 
     public Text(PointF point, float densityScale) { 
      mPoint = point; 
      mDensityScale = densityScale; 

      mBoxPaint = new Paint(); 
      mBoxPaint.setStyle(Style.FILL); 
      mBoxPaint.setColor(BOX_COLOR); 

      mBorderPaint = new Paint(); 
      mBorderPaint.setStyle(Style.STROKE); 
      mBorderPaint.setColor(BORDER_COLOR); 
      mBorderPaint.setStrokeWidth(getBorderWidth()); 

      mTextPaint = new Paint(); 
      mTextPaint.setTextSize(getFontSize()); 
      mTextPaint.setAntiAlias(true); 
      mTextPaint.setTextAlign(Paint.Align.LEFT); 
      mTextPaint.setColor(FONT_COLOR); 
     } 

     // ----------------------------------------------------------------------- 
     // 
     // Methods 
     // 
     // ----------------------------------------------------------------------- 
     public void setText(String text) { 
      mTextString = text; 
     } 

     public boolean isEmpty() { 
      return Utils.isEmpty(mTextString); 
     } 

     @Override 
     public int describeContents() { 
      return 0; 
     } 

     @Override 
     public void writeToParcel(Parcel dest, int flags) { 
     } 

     private float getFontSize() { 
      return FONT_SIZE * mDensityScale; 
     } 

     private float getPadding() { 
      return PADDING * mDensityScale; 
     } 

     private float getBorderWidth() { 
      return BORDER_WIDTH * mDensityScale; 
     } 

     private float getStringWidth(String string) { 
      Rect bounds = new Rect(); 
      mTextPaint.getTextBounds(string, 0, string.length(), bounds); 
      return bounds.width(); 
     } 

     @Override 
     public void draw(Canvas canvas, float viewWidth, float viewHeight) { 
      ArrayList<String> labelList = new ArrayList<String>(); 

      String[] lines = mTextString.split(" "); 
      String prevLine = ""; 
      float textHeight = (2 * getBorderWidth() + 2 * getPadding()) 
        /viewHeight * canvas.getHeight(); 
      float textWidth = 0; 
      for (int i = 0; i < lines.length; ++i) { 
       String string = lines[i]; 
       String newline = prevLine.concat(" " + string).trim(); 

       float prevLineWidth = (getStringWidth(prevLine) + 2 
         * getBorderWidth() + 2 * getPadding()) 
         /viewWidth * canvas.getWidth(); 
       float newLineWidth = (getStringWidth(newline) + 2 
         * getBorderWidth() + 2 * getPadding()) 
         /viewWidth * canvas.getWidth(); 
       float availableWidth = canvas.getWidth() - mPoint.x/viewWidth 
         * canvas.getWidth() + 1; 

       if (newLineWidth > availableWidth) { 
        if (!Utils.isEmpty(prevLine)) { 
         labelList.add(prevLine); 
         textHeight += (getFontSize() + getPadding()) 
           /viewHeight * canvas.getHeight(); 
         if (prevLineWidth >= textWidth) 
          textWidth = prevLineWidth; 
        } 
        prevLine = string; 
        if (i == lines.length - 1) { 
         prevLineWidth = (getStringWidth(prevLine) + 2 
           * getBorderWidth() + 2 * getPadding()) 
           /viewWidth * canvas.getWidth(); 
         labelList.add(prevLine); 
         if (prevLineWidth > textWidth) 
          textWidth = prevLineWidth; 
         textHeight += getFontSize()/viewHeight 
           * canvas.getHeight(); 
        } 
       } else if (i == lines.length - 1) { 
        labelList.add(newline); 
        if (newLineWidth > textWidth) 
         textWidth = newLineWidth; 
        textHeight += getFontSize()/viewHeight 
          * canvas.getHeight(); 
       } else { 
        prevLine = newline; 
       } 

      } 

      textHeight = Math.min(textHeight, canvas.getHeight() - mPoint.y 
        /viewHeight * canvas.getHeight()); 
      textWidth = Math.min(textWidth, canvas.getWidth() - mPoint.x 
        /viewWidth * canvas.getWidth()); 
      if (isEmpty()) { 
       textWidth = (getPadding() * 2 + getBorderWidth() * 2) 
         /viewWidth * canvas.getWidth(); 
      } 
      canvas.drawRect(mPoint.x/viewWidth * canvas.getWidth(), mPoint.y 
        /viewHeight * canvas.getHeight(), mPoint.x/viewWidth 
        * canvas.getWidth() + textWidth, mPoint.y/viewHeight 
        * canvas.getHeight() + textHeight, mBoxPaint); 
      mBorderPaint.setStrokeWidth(getBorderWidth()/viewWidth 
        * canvas.getWidth()); 
      canvas.drawRect(mPoint.x/viewWidth * canvas.getWidth(), mPoint.y 
        /viewHeight * canvas.getHeight(), mPoint.x/viewWidth 
        * canvas.getWidth() + textWidth, mPoint.y/viewHeight 
        * canvas.getHeight() + textHeight, mBorderPaint); 
      mBorderPaint.setStrokeWidth(getBorderWidth()); 
      float offset = (getBorderWidth() + getPadding() + getFontSize()) 
        /viewWidth * canvas.getWidth(); 
      mTextPaint.setTextSize(getFontSize()/viewHeight 
        * canvas.getHeight()); 
      for (String string : labelList) { 
       canvas.drawText(string, (mPoint.x + getBorderWidth()) 
         /viewWidth * canvas.getWidth(), mPoint.y/viewHeight 
         * canvas.getHeight() + offset, mTextPaint); 
       offset += (getFontSize() + getPadding())/viewHeight 
         * canvas.getHeight(); 
      } 
      mTextPaint.setTextSize(getFontSize()); 
     } 
    } 
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