LinearLayout @ 422725b0 non è un cassetto scorrevole

Question

Ciao, sto impazzendo con questo.

Ci sono diverse domande là fuori, ma nessuna sembra aver risolto il mio problema. Ricevo un errore ogni volta che cerco di modificare lo stile di un cassetto.

<android.support.v4.widget.DrawerLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@+id/drawer_layout" 
android:layout_width="match_parent" 
android:layout_height="match_parent"> 

<!-- As the main content view, the view below consumes the entire 
    space available using match_parent in both dimensions. --> 
<FrameLayout 
    android:id="@+id/content_frame" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" /> 

<LinearLayout 
    android:id="@+id/left_drawer" 
    android:layout_width="240dp" 
    android:layout_height="match_parent" 
    android:gravity="start" 
    > 

    <TextView 
     android:layout_height="wrap_content" 
     android:layout_width="match_parent" 
     android:text="test" 
     android:background="@drawable/black" 
     android:textColor="#94A1A1" 
     android:textAppearance="?android:attr/textAppearanceListItemSmall" 
     android:minHeight="?android:attr/listPreferredItemHeightSmall" 
     android:layout_weight="1"  
    /> 

    <ListView 
     android:id="@+id/left_drawer_child" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:choiceMode="singleChoice" 
     android:divider="@android:color/transparent" 
     android:dividerHeight="0dp" 
     android:background="#323232" 
     android:layout_weight="1" 
    /> 

</LinearLayout> 
</android.support.v4.widget.DrawerLayout> 

e Java

/* 
* Copyright 2013 The Android Open Source Project 
* 
* Licensed under the Apache License, Version 2.0 (the "License"); 
* you may not use this file except in compliance with the License. 
* You may obtain a copy of the License at 
* 
*  http://www.apache.org/licenses/LICENSE-2.0 
* 
* Unless required by applicable law or agreed to in writing, software 
* distributed under the License is distributed on an "AS IS" BASIS, 
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
* See the License for the specific language governing permissions and 
* limitations under the License. 
*/ 

package com.example.drawertest; 

import java.util.Locale; 

import android.app.Activity; 
import android.app.Fragment; 
import android.app.FragmentManager; 
import android.app.SearchManager; 
import android.content.Intent; 
import android.content.res.Configuration; 
import android.graphics.drawable.Drawable; 
import android.os.Bundle; 
import android.support.v4.app.ActionBarDrawerToggle; 
import android.support.v4.view.GravityCompat; 
import android.support.v4.widget.DrawerLayout; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.ImageView; 
import android.widget.LinearLayout; 
import android.widget.ListView; 
import android.widget.TextView; 
import android.widget.Toast; 

/** 
* This example illustrates a common usage of the DrawerLayout widget 
* in the Android support library. 
* <p/> 
* <p>When a navigation (left) drawer is present, the host activity should detect presses of 
* the action bar's Up affordance as a signal to open and close the navigation drawer. The 
* ActionBarDrawerToggle facilitates this behavior. 
* Items within the drawer should fall into one of two categories:</p> 
* <p/> 
* <ul> 
* <li><strong>View switches</strong>. A view switch follows the same basic policies as 
* list or tab navigation in that a view switch does not create navigation history. 
* This pattern should only be used at the root activity of a task, leaving some form 
* of Up navigation active for activities further down the navigation hierarchy.</li> 
* <li><strong>Selective Up</strong>. The drawer allows the user to choose an alternate 
* parent for Up navigation. This allows a user to jump across an app's navigation 
* hierarchy at will. The application should treat this as it treats Up navigation from 
* a different task, replacing the current task stack using TaskStackBuilder or similar. 
* This is the only form of navigation drawer that should be used outside of the root 
* activity of a task.</li> 
* </ul> 
* <p/> 
* <p>Right side drawers should be used for actions, not navigation. This follows the pattern 
* established by the Action Bar that navigation should be to the left and actions to the right. 
* An action should be an operation performed on the current contents of the window, 
* for example enabling or disabling a data overlay on top of the current content.</p> 
*/ 


public class MainActivity extends Activity { 
    private DrawerLayout mDrawerLayout; 
    private ListView mDrawerList; 
    private ActionBarDrawerToggle mDrawerToggle; 
    private LinearLayout linearLayout; 

    private CharSequence mDrawerTitle; 
    private CharSequence mTitle; 
    private String[] mPlanetTitles; 
    public TextView title; 
    public int theme = 1; 
    public int theme2 = 1; 
    public Drawable background = null; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     if(theme == 1){ 
     setTheme(R.style.CustomActionBarTheme); 
     } else { 
      setTheme(R.style.CustomActionBarBlueTheme); 
     } 
     setContentView(R.layout.activity_main); 

     mTitle = mDrawerTitle = getTitle(); 
     mPlanetTitles = getResources().getStringArray(R.array.planets_array); 
     mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
     mDrawerList = (ListView) findViewById(R.id.left_drawer_child); 
     linearLayout = (LinearLayout)findViewById(R.id.left_drawer); 

     // set a custom shadow that overlays the main content when the drawer opens 
     mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); 
     // set up the drawer's list view with items and click listener 
     mDrawerList.setAdapter(new ArrayAdapter<String>(this, 
       R.layout.drawer_list_item, mPlanetTitles)); 
     mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); 

     // enable ActionBar app icon to behave as action to toggle nav drawer 
     getActionBar().setDisplayHomeAsUpEnabled(true); 
     getActionBar().setHomeButtonEnabled(true); 

     // ActionBarDrawerToggle ties together the the proper interactions 
     // between the sliding drawer and the action bar app icon 
     mDrawerToggle = new ActionBarDrawerToggle(
       this,     /* host Activity */ 
       mDrawerLayout,   /* DrawerLayout object */ 
       R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */ 
       R.string.drawer_open, /* "open drawer" description for accessibility */ 
       R.string.drawer_close /* "close drawer" description for accessibility */ 
       ) { 
      public void onDrawerClosed(View view) { 
       getActionBar().setTitle(mTitle); 
       invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() 
       getActionBar().setBackgroundDrawable(background); 
      } 

      public void onDrawerOpened(View drawerView) { 
       // getActionBar().setTitle(mDrawerTitle); 
       invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() 

      } 
     }; 
     mDrawerLayout.setDrawerListener(mDrawerToggle); 

     if (savedInstanceState == null) { 
      selectItem(0); 
     } 

    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     MenuInflater inflater = getMenuInflater(); 
     inflater.inflate(R.menu.main, menu); 
     return super.onCreateOptionsMenu(menu); 
    } 

    /* Called whenever we call invalidateOptionsMenu() */ 
    @Override 
    public boolean onPrepareOptionsMenu(Menu menu) { 
     // If the nav drawer is open, hide action items related to the content view 
     boolean drawerOpen = mDrawerLayout.isDrawerOpen(linearLayout); 
     menu.findItem(R.id.action_websearch).setVisible(!drawerOpen); 
     return super.onPrepareOptionsMenu(menu); 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // The action bar home/up action should open or close the drawer. 
     // ActionBarDrawerToggle will take care of this. 
     if (mDrawerToggle.onOptionsItemSelected(item)) { 

      return true; 
     } 
     // Handle action buttons 
     switch(item.getItemId()) { 
     case R.id.action_websearch: 
      // create intent to perform web search for this planet 
      Intent intent = new Intent(Intent.ACTION_WEB_SEARCH); 
      intent.putExtra(SearchManager.QUERY, getActionBar().getTitle()); 
      // catch event that there's no activity to handle intent 
      if (intent.resolveActivity(getPackageManager()) != null) { 
       startActivity(intent); 
      } else { 
       Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show(); 
      } 
      return true; 
     default: 
      return super.onOptionsItemSelected(item); 
     } 
    } 

    /* The click listner for ListView in the navigation drawer */ 
    private class DrawerItemClickListener implements ListView.OnItemClickListener { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      updatebackground(view,position); 
      selectItem(position); 
     } 
    } 
    private void updatebackground(View view,int position) { 
     // update the main content by replacing fragments 
     int right = view.getPaddingRight(); 
     int left = view.getPaddingLeft(); 
     int top = view.getPaddingTop(); 
     int bottom = view.getPaddingBottom(); 
     switch(position) { 
     case 0 : 
       view.setBackgroundResource(R.drawable.redbackground); 
       background = getResources().getDrawable(R.drawable.red); 

     break; 
     case 1 : view.setBackgroundResource(R.drawable.bluebackground); 
       background = getResources().getDrawable(R.drawable.blue); 

     break; 
     case 2 : view.setBackgroundResource(R.drawable.brownbackground); 
       background = getResources().getDrawable(R.drawable.brown); 

     break; 
     case 3 : view.setBackgroundResource(R.drawable.greenbackground); 
     background = getResources().getDrawable(R.drawable.green); 

     break; 
     case 4 : view.setBackgroundResource(R.drawable.orangebackground); 
     background = getResources().getDrawable(R.drawable.orange); 

     break; 
     case 5 : view.setBackgroundResource(R.drawable.purplebackground); 
     background = getResources().getDrawable(R.drawable.purple); 

     break; 
     case 6 : view.setBackgroundResource(R.drawable.pinkbackground); 
     background = getResources().getDrawable(R.drawable.pink); 

     break; 
     case 7 : view.setBackgroundResource(R.drawable.yellowbackground); 
     background = getResources().getDrawable(R.drawable.yellow); 

     break; 
     default: view.setBackgroundResource(R.drawable.blackbackground); 
     background = getResources().getDrawable(R.drawable.black); 


     } 
     view.setPadding(left, top, right, bottom); 
     getActionBar().setBackgroundDrawable(background); 
    } 
    private void selectItem(int position) { 
     // update the main content by replacing fragments 
     Fragment fragment = new PlanetFragment(); 
     Bundle args = new Bundle(); 
     args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position); 
     fragment.setArguments(args); 

     FragmentManager fragmentManager = getFragmentManager(); 
     fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit(); 

     // update selected item and title, then close the drawer 
     mDrawerList.setItemChecked(position, true); 
     setTitle(mPlanetTitles[position]); 
     mDrawerLayout.closeDrawer(linearLayout); 

    } 

    @Override 
    public void setTitle(CharSequence title) { 
     mTitle = title; 
     getActionBar().setTitle(mTitle); 
     if(theme == 1){ 
      theme =2; 
     }else { 
      theme =1; 
     } 

    } 

    /** 
    * When using the ActionBarDrawerToggle, you must call it during 
    * onPostCreate() and onConfigurationChanged()... 
    */ 

    @Override 
    protected void onPostCreate(Bundle savedInstanceState) { 
     super.onPostCreate(savedInstanceState); 
     // Sync the toggle state after onRestoreInstanceState has occurred. 
     mDrawerToggle.syncState(); 
    } 

    @Override 
    public void onConfigurationChanged(Configuration newConfig) { 
     super.onConfigurationChanged(newConfig); 
     // Pass any configuration change to the drawer toggls 
     mDrawerToggle.onConfigurationChanged(newConfig); 
    } 

    /** 
    * Fragment that appears in the "content_frame", shows a planet 
    */ 
    public static class PlanetFragment extends Fragment { 
     public static final String ARG_PLANET_NUMBER = "planet_number"; 

     public PlanetFragment() { 
      // Empty constructor required for fragment subclasses 
     } 

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
       Bundle savedInstanceState) { 
      View rootView = inflater.inflate(R.layout.fragment_planet, container, false); 
      int i = getArguments().getInt(ARG_PLANET_NUMBER); 
      String planet = getResources().getStringArray(R.array.planets_array)[i]; 

      int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()), 
          "drawable", getActivity().getPackageName()); 
      ((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId); 
      getActivity().setTitle(planet); 
      return rootView; 
     } 
    } 
} 

L'errore che sto ottenendo è

11-27 00:56:56.545: E/AndroidRuntime(10000): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.drawertest/com.example.drawertest.MainActivity}: java.lang.IllegalArgumentException: View android.widget.LinearLayout@422725b0 is not a sliding drawer 

Qualsiasi aiuto sarebbe grande grazie in anticipo

Answer 1

La vista deve avere sia Gravity.LEFT o Gravity.RIGHT per essere riconosciuto come un cassetto scorrevole. È possibile sostituire

android:gravity="start" 

con

android:gravity="left" 

o, come suggerito sopra, in alternativa sostituire

isDrawerOpen(linearLayout) 

con

isDrawerOpen(Gravity.LEFT) 

Answer 2

Ho anche avuto un simile problema. Dopo aver aggiunto

android:layout_gravity="left" 

tutto ha funzionato bene.

Answer 3

Ho appena aggiunto

android:layout_gravity="start" 

e che ha funzionato per me.