Fase: 1 Crea classe WebView personalizzata. Questa classe sovrascriverà la barra di azione nativa alla lunga pressione sul testo della vista web. Inoltre gestisce il caso di selezione per diverse versioni di Android (testato in 4.0 in poi) Questo codice prende il testo selezionato utilizzando javascript.
public class CustomWebView extends WebView {
private Context context;
// override all other constructor to avoid crash
public CustomWebView(Context context) {
super(context);
this.context = context;
WebSettings webviewSettings = getSettings();
webviewSettings.setJavaScriptEnabled(true);
// add JavaScript interface for copy
addJavascriptInterface(new WebAppInterface(context), "JSInterface");
}
// setting custom action bar
private ActionMode mActionMode;
private ActionMode.Callback mSelectActionModeCallback;
private GestureDetector mDetector;
// this will over ride the default action bar on long press
@Override
public ActionMode startActionMode(Callback callback) {
ViewParent parent = getParent();
if (parent == null) {
return null;
}
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
String name = callback.getClass().toString();
if (name.contains("SelectActionModeCallback")) {
mSelectActionModeCallback = callback;
mDetector = new GestureDetector(context,
new CustomGestureListener());
}
}
CustomActionModeCallback mActionModeCallback = new CustomActionModeCallback();
return parent.startActionModeForChild(this, mActionModeCallback);
}
private class CustomActionModeCallback implements ActionMode.Callback {
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
mActionMode = mode;
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false;
}
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch (item.getItemId()) {
case R.id.copy:
getSelectedData();
mode.finish();
return true;
case R.id.share:
mode.finish();
return true;
default:
mode.finish();
return false;
}
}
@Override
public void onDestroyActionMode(ActionMode mode) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
clearFocus();
}else{
if (mSelectActionModeCallback != null) {
mSelectActionModeCallback.onDestroyActionMode(mode);
}
mActionMode = null;
}
}
}
private void getSelectedData(){
String js= "(function getSelectedText() {"+
"var txt;"+
"if (window.getSelection) {"+
"txt = window.getSelection().toString();"+
"} else if (window.document.getSelection) {"+
"txt = window.document.getSelection().toString();"+
"} else if (window.document.selection) {"+
"txt = window.document.selection.createRange().text;"+
"}"+
"JSInterface.getText(txt);"+
"})()";
// calling the js function
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
evaluateJavascript("javascript:"+js, null);
}else{
loadUrl("javascript:"+js);
}
}
private class CustomGestureListener extends GestureDetector.SimpleOnGestureListener {
@Override
public boolean onSingleTapUp(MotionEvent e) {
if (mActionMode != null) {
mActionMode.finish();
return true;
}
return false;
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// Send the event to our gesture detector
// If it is implemented, there will be a return value
if(mDetector !=null)
mDetector.onTouchEvent(event);
// If the detected gesture is unimplemented, send it to the superclass
return super.onTouchEvent(event);
}
}
Fase 2: creare classe separata per l'interfaccia WebView. Questa listnes classe per l'evento da una volta codice javascript è sempre eseguito
public class WebAppInterface {
Context mContext;
WebAppInterface(Context c) {
mContext = c;
}
@JavascriptInterface
public void getText(String text) {
// put selected text into clipdata
ClipboardManager clipboard = (ClipboardManager)
mContext.getSystemService(Context.CLIPBOARD_SERVICE);
ClipData clip = ClipData.newPlainText("simple text",text);
clipboard.setPrimaryClip(clip);
// gives the toast for selected text
Toast.makeText(mContext, text, Toast.LENGTH_SHORT).show();
}
}
Fase 3: Aggiungi menu.xml per il menu personalizzato in res> cartella di menu
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="@+id/copy"
android:icon="@drawable/ic_action_copy"
android:showAsAction="always"
android:title="copy">
</item>
<item
android:id="@+id/share"
android:icon="@drawable/ic_action_share"
android:showAsAction="always"
android:title="share">
</item>
ho preso aiuto di diversi collegamenti elencati di seguito per raggiungere questo obiettivo: grazie a voi ragazzi.
come utilizzare javascript WebView http://developer.android.com/guide/webapps/webview.html#UsingJavaScript
per l'iniezione di javascript Why can't I inject this javascript in the webview on android?
per superiori bar azione predefinita How to override default text selection of android webview os 4.1+?
per la versione 4.0. a 4.3 selezione del testo Webview text selection not clearing
Si prega di aggiungere snippet completo –