因notifyDataSetChanged（）問題導致的隨機崩潰

隨機崩潰，沒有明顯的模式。當我打開ListView時，應用程序每隔幾（隨機）次就崩潰一次以下錯誤。 有很多東西要學，所以如果這是一個非常明顯的錯誤，請原諒我。因notifyDataSetChanged（）問題導致的隨機崩潰

錯誤的logcat

W/dalvikvm(9445): threadid=1: thread exiting with uncaught exception (group=0x40018578) 

E/AndroidRuntime(9445): FATAL EXCEPTION: main 

E/AndroidRuntime(9445): java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(2131361795, class android.widget.ListView) with Adapter(class gst.sies.popatt.LazyAdapter)] 

E/AndroidRuntime(9445): at android.widget.ListView.layoutChildren(ListView.java:1545) 

E/AndroidRuntime(9445): at android.widget.AbsListView.onLayout(AbsListView.java:1422) 

E/AndroidRuntime(9445): at android.view.View.layout(View.java:7175) 

E/AndroidRuntime(9445): at android.widget.RelativeLayout.onLayout(RelativeLayout.java:912) 

E/AndroidRuntime(9445): at android.view.View.layout(View.java:7175) 

E/AndroidRuntime(9445): at android.widget.FrameLayout.onLayout(FrameLayout.java:338) 

E/AndroidRuntime(9445): at android.view.View.layout(View.java:7175) 

E/AndroidRuntime(9445): at android.widget.FrameLayout.onLayout(FrameLayout.java:338) 

E/AndroidRuntime(9445): at android.view.View.layout(View.java:7175) 

E/AndroidRuntime(9445): at android.view.ViewRoot.performTraversals(ViewRoot.java:1146) 

E/AndroidRuntime(9445): at android.view.ViewRoot.handleMessage(ViewRoot.java:1865) 

E/AndroidRuntime(9445): at android.os.Handler.dispatchMessage(Handler.java:99) 

E/AndroidRuntime(9445): at android.os.Looper.loop(Looper.java:130) 

E/AndroidRuntime(9445): at android.app.ActivityThread.main(ActivityThread.java:3687) 

E/AndroidRuntime(9445): at java.lang.reflect.Method.invokeNative(Native Method) 

E/AndroidRuntime(9445): at java.lang.reflect.Method.invoke(Method.java:507) 

E/AndroidRuntime(9445): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 

E/AndroidRuntime(9445): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 

E/AndroidRuntime(9445): at dalvik.system.NativeStart.main(Native Method) 

D/dalvikvm(9445): GC_CONCURRENT freed 473K, 50% free 3063K/6023K, external 714K/1025K, paused 4ms+5ms 

E/liblog (1475): failed to call dumpstate 

E/  (1475): Dumpstate > /data/log/dumpstate_app_error 

D/InputReader(1475): Input event: value=1 

D/InputReader(1475): Input event: value=0 

D/InputReader(1475): Input event: value=1

代碼

package gst.sies.popatt; 

import java.io.File; 
import java.util.ArrayList; 
import java.util.Calendar; 
import java.util.HashMap; 
import android.annotation.SuppressLint; 
import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.content.res.Resources; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.graphics.Typeface; 
import android.os.AsyncTask; 
import android.os.Build; 
import android.os.Bundle; 
import android.os.Environment; 
import android.view.View; 
import android.view.Window; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ImageView; 
import android.widget.ListView; 
import android.widget.TextView; 

public class GalleryActivity extends Activity 
{ 
    static final String KEY_ID = "id"; 
    static final String KEY_TITLE = "title"; 
    static final String KEY_THUMB_URL = "thumb_url"; 
    public Typeface myTypeface; 
    private ArrayList<HashMap<String, String>> nomineeList; 
    private ListView n_list; 
    private Intent back_button; 
    private String[] category; 
    private LazyAdapter adapter; 
    private int category_index; 
    private SQLiteDatabase db; 
    private SharedPreferences prefs; 
    private TextView voted; 
    private UserLoginTask getNominees; 
    private ImageView iv; 
    private boolean date; 
    int i=0; 

    @SuppressLint("SdCardPath") 
    @Override 
    public void onCreate(Bundle savedInstanceState){ 
     super.onCreate(savedInstanceState); 

     String title = getIntent().getStringExtra("title"); 

     if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.ICE_CREAM_SANDWICH) 
     { 
      this.requestWindowFeature(Window.FEATURE_NO_TITLE); 
     } 
     else 
      this.setTitle(title); 
     setContentView(R.layout.activity_gallery); 
     myTypeface = Typeface.createFromAsset(
       this.getAssets(), 
       "ROBOTO.TTF"); 

     prefs= new ObscuredSharedPreferences( 
       GalleryActivity.this, GalleryActivity.this.getSharedPreferences("gst.sies.popatt", Context.MODE_PRIVATE)); 

     back_button= new Intent (GalleryActivity.this, CategoriesActivity.class); 
     if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.ICE_CREAM_SANDWICH) 
      voted = (TextView) findViewById(R.id.textView3); 
     else 
      voted = (TextView) findViewById(R.id.TextView_14); 
     iv= (ImageView) findViewById(R.id.voted_thumbnail); 
     category_index = getIntent().getIntExtra("category_index", 0); 
     if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.ICE_CREAM_SANDWICH) 
     { 
      TextView tv = (TextView) findViewById(R.id.textView1); 
      tv.setTypeface(myTypeface); 
      tv.setText(title); 

      voted.setTypeface(myTypeface); 
     } 

     if(prefs.getString(Integer.toString(category_index), "NA").equals("NA")) 
      voted.setText("Voted for: No One"); 
     else 
     { 
      iv.setImageResource(R.drawable.radio_checked); 
      //voted.setText("Voted for: "+ prefs.getString(Integer.toString(category_index), "No One")); 
      voted.setText("can't do it yet ;)"); 
      voted.setSelected(true); 
     } 

     Calendar now = Calendar.getInstance(); 
     if(now.get(Calendar.DATE) >= 1 && now.get(Calendar.DATE) <= 18) 
      date = true; 
     else 
      date = false; 

     nomineeList = new ArrayList<HashMap<String, String>>(); 
     File nom_db = new File (Environment.getExternalStorageDirectory()+"/Android/data/gst.sies.popatt/databases/nominees.db"); 

     db = SQLiteDatabase.openOrCreateDatabase(nom_db, null); 

     getNominees = new UserLoginTask(); 
     getNominees.execute((Void) null); 

     n_list = (ListView) findViewById(R.id.nominee_list);  

     adapter=new LazyAdapter(this, nomineeList); 
     adapter.notifyDataSetChanged(); 

     n_list.setAdapter(adapter); 

     n_list.setOnItemClickListener(new OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, 
        long id) { 
       String votedOne = (String) ((TextView) view.findViewById(R.id.title)).getText(); 
       prefs.edit().putString(Integer.toString(category_index), votedOne).commit(); 
       if(date) 
       voted.setText("Voted for: "+ votedOne); 
       else 
       voted.setText("can't do it yet ;)"); 

       voted.setSelected(true); 
       iv.setImageResource(R.drawable.radio_checked); 
      } 
     }); 
    } 
    @Override 
    public void onBackPressed() 
    { 
     startActivity(back_button); 
     finish(); 
    } 

    public boolean isTableExists(String tableName) { 
     Cursor cursor = db.rawQuery("select DISTINCT tbl_name from sqlite_master where tbl_name = '"+tableName+"'", null); 
     if(cursor!=null) { 
      if(cursor.getCount()>0) { 
       cursor.close(); 
       return true; 
      } 
      cursor.close(); 
     } 
     return false; 
    } 
    public class UserLoginTask extends AsyncTask<Void, Void, Boolean> { 

     @Override 
     protected Boolean doInBackground(Void... params) { 
      Resources res = getResources(); 
      category = res.getStringArray(R.array.category_list_short); 
      if(isTableExists(category[category_index]) && date) 
      { 
       Cursor c = db.rawQuery("SELECT * FROM "+category[category_index]+" WHERE name IS NOT NULL", null); 
       if(c.moveToFirst()) 
       { 
        while(!c.isAfterLast()) 
        { 
         HashMap<String, String> map = new HashMap<String, String>(); 

         map.put(KEY_ID, c.getString(0)); 
         map.put(KEY_TITLE, c.getString(c.getColumnIndex("name"))); 
         map.put(KEY_THUMB_URL, c.getString(c.getColumnIndex("url"))); 
         nomineeList.add(map); 
         c.moveToNext(); 
        } 
        c.close(); 

        return true; 
       } 
      } 
      else 
      { 
       for (int i = 0; i < 10 ; i++) { 

       HashMap<String, String> map = new HashMap<String, String>(); 

       map.put(KEY_ID, Integer.toString(i)); 
       map.put(KEY_TITLE, "No Name Available"); 
       map.put(KEY_THUMB_URL, "https://fbcdn-sphotos-d-a.akamaihd.net/hphotos-ak-snc6/5939_10151499921443518_604230176_s.jpg"); 
       nomineeList.add(map); 
       } 
       return true; 
      } 
      return true; 
     } 

     @Override 
     protected void onPostExecute(Boolean success) { 
      super.onPostExecute(success); 
      runOnUiThread(new Runnable() { 
       public void run() { 
        db.close(); 
        adapter.notifyDataSetChanged(); 
       } 
      }); 
     } 

     @Override 
     protected void onCancelled() { 

     } 
     @Override 
     protected void onPreExecute() 
     {  } 
    } 
}

適配器類

package gst.sies.popatt; 

import java.util.ArrayList; 
import java.util.HashMap; 

import android.app.Activity; 
import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.ImageView; 
import android.widget.TextView; 

public class LazyAdapter extends BaseAdapter { 

    private Activity activity; 
    private ArrayList<HashMap<String, String>> data; 
    private static LayoutInflater inflater=null; 
    public ImageLoader imageLoader; 

    public LazyAdapter(Activity a, ArrayList<HashMap<String, String>> d) { 
     activity = a; 
     data=d; 
     inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     imageLoader=new ImageLoader(activity.getApplicationContext()); 
     //rbState = new boolean [100]; 
    } 
    public int getCount() { 
     return data.size(); 
    } 

    public Object getItem(int position) { 
     return position; 
    } 

    public long getItemId(int position) { 
     return position; 
    } 

    public View getView(int position, View convertView, ViewGroup parent) { 
     View vi=convertView; 
     if(convertView==null) 
      vi = inflater.inflate(R.layout.rowview, null); 
     TextView title = (TextView)vi.findViewById(R.id.title); // title 
     ImageView thumb_image=(ImageView)vi.findViewById(R.id.list_image); // thumb image 
     GalleryActivity gl = new GalleryActivity(); 
     title.setTypeface(gl.myTypeface); 
     HashMap<String, String> nominee = new HashMap<String, String>(); 
     nominee = data.get(position); 
     title.setText(nominee.get(GalleryActivity.KEY_TITLE)); 
     imageLoader.DisplayImage(nominee.get(GalleryActivity.KEY_THUMB_URL),R.drawable.ic_launcher, thumb_image); 
     return vi;  
    } 

}

我沒試過多少，說實話，因爲我不知道可能是什麼問題。

編輯：更新的代碼

package gst.sies.popatt; 

import java.io.File; 
import java.util.ArrayList; 
import java.util.Calendar; 
import java.util.HashMap; 
import android.annotation.SuppressLint; 
import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.content.res.Resources; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.graphics.Typeface; 
import android.os.AsyncTask; 
import android.os.Build; 
import android.os.Bundle; 
import android.os.Environment; 
import android.view.View; 
import android.view.Window; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ImageView; 
import android.widget.ListView; 
import android.widget.TextView; 

public class GalleryActivity extends Activity 
{ 
    static final String KEY_ID = "id"; 
    static final String KEY_TITLE = "title"; 
    static final String KEY_THUMB_URL = "thumb_url"; 
    public Typeface myTypeface; 
    private ArrayList<HashMap<String, String>> nomineeList; 
    private ListView n_list; 
    private Intent back_button; 
    private String[] category; 
    private LazyAdapter adapter; 
    private int category_index; 
    private SQLiteDatabase db; 
    private SharedPreferences prefs; 
    private TextView voted; 
    private UserLoginTask getNominees; 
    private ImageView iv; 
    private boolean date; 
    int i=0; 

    @SuppressLint("SdCardPath") 
    @Override 
    public void onCreate(Bundle savedInstanceState){ 
     super.onCreate(savedInstanceState); 

     String title = getIntent().getStringExtra("title"); 

     if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.ICE_CREAM_SANDWICH) 
     { 
      this.requestWindowFeature(Window.FEATURE_NO_TITLE); 
     } 
     else 
      this.setTitle(title); 
     setContentView(R.layout.activity_gallery); 
     myTypeface = Typeface.createFromAsset(
       this.getAssets(), 
       "ROBOTO.TTF"); 

     prefs= new ObscuredSharedPreferences( 
       GalleryActivity.this, GalleryActivity.this.getSharedPreferences("gst.sies.popatt", Context.MODE_PRIVATE)); 

     back_button= new Intent (GalleryActivity.this, CategoriesActivity.class); 
     if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.ICE_CREAM_SANDWICH) 
      voted = (TextView) findViewById(R.id.textView3); 
     else 
      voted = (TextView) findViewById(R.id.TextView_14); 
     iv= (ImageView) findViewById(R.id.voted_thumbnail); 
     category_index = getIntent().getIntExtra("category_index", 0); 
     if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.ICE_CREAM_SANDWICH) 
     { 
      TextView tv = (TextView) findViewById(R.id.textView1); 
      tv.setTypeface(myTypeface); 
      tv.setText(title); 

      voted.setTypeface(myTypeface); 
     } 

     if(prefs.getString(Integer.toString(category_index), "NA").equals("NA")) 
      voted.setText("Voted for: No One"); 
     else 
     { 
      iv.setImageResource(R.drawable.radio_checked); 
      //voted.setText("Voted for: "+ prefs.getString(Integer.toString(category_index), "No One")); 
      voted.setText("can't do it yet ;)"); 
      voted.setSelected(true); 
     } 

     Calendar now = Calendar.getInstance(); 
     if(now.get(Calendar.DATE) >= 1 && now.get(Calendar.DATE) <= 18) 
      date = true; 
     else 
      date = false; 

     nomineeList = new ArrayList<HashMap<String, String>>(); 
     File nom_db = new File (Environment.getExternalStorageDirectory()+"/Android/data/gst.sies.popatt/databases/nominees.db"); 

     db = SQLiteDatabase.openOrCreateDatabase(nom_db, null); 

     getNominees = new UserLoginTask(); 
     getNominees.execute((Void) null); 

     n_list = (ListView) findViewById(R.id.nominee_list);  

     adapter=new LazyAdapter(this, nomineeList); 
     n_list.setAdapter(adapter); 
     adapter.notifyDataSetChanged(); 

     n_list.setOnItemClickListener(new OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, 
        long id) { 
       String votedOne = (String) ((TextView) view.findViewById(R.id.title)).getText(); 
       prefs.edit().putString(Integer.toString(category_index), votedOne).commit(); 
       if(date) 
       voted.setText("Voted for: "+ votedOne); 
       else 
       voted.setText("can't do it yet ;)"); 

       voted.setSelected(true); 
       iv.setImageResource(R.drawable.radio_checked); 
      } 
     }); 
    } 
    @Override 
    public void onBackPressed() 
    { 
     startActivity(back_button); 
     finish(); 
    } 

    public boolean isTableExists(String tableName) { 
     Cursor cursor = db.rawQuery("select DISTINCT tbl_name from sqlite_master where tbl_name = '"+tableName+"'", null); 
     if(cursor!=null) { 
      if(cursor.getCount()>0) { 
       cursor.close(); 
       return true; 
      } 
      cursor.close(); 
     } 
     return false; 
    } 
    public class UserLoginTask extends AsyncTask<Void, Void, Boolean> { 

     @Override 
     protected Boolean doInBackground(Void... params) { 
      Resources res = getResources(); 
      category = res.getStringArray(R.array.category_list_short); 
      if(isTableExists(category[category_index]) && date) 
      { 
       Cursor c = db.rawQuery("SELECT * FROM "+category[category_index]+" WHERE name IS NOT NULL", null); 
       if(c.moveToFirst()) 
       { 
        while(!c.isAfterLast()) 
        { 
         HashMap<String, String> map = new HashMap<String, String>(); 

         map.put(KEY_ID, c.getString(0)); 
         map.put(KEY_TITLE, c.getString(c.getColumnIndex("name"))); 
         map.put(KEY_THUMB_URL, c.getString(c.getColumnIndex("url"))); 
         nomineeList.add(map); 
         c.moveToNext(); 
        } 
        c.close(); 

        return true; 
       } 
      } 
      else 
      { 
       for (int i = 0; i < 10 ; i++) { 

       HashMap<String, String> map = new HashMap<String, String>(); 

       map.put(KEY_ID, Integer.toString(i)); 
       map.put(KEY_TITLE, "No Name Available"); 
       map.put(KEY_THUMB_URL, "https://fbcdn-sphotos-d-a.akamaihd.net/hphotos-ak-snc6/5939_10151499921443518_604230176_s.jpg"); 
       nomineeList.add(map); 
       } 
       return true; 
      } 
      return true; 
     } 

     @Override 
     protected void onPostExecute(Boolean success) { 
      super.onPostExecute(success); 
      db.close(); 
     } 

     @Override 
     protected void onCancelled() { 

     } 
     @Override 
     protected void onPreExecute() 
     {  } 
    } 
}

來源

2013-03-31 hypd09

呼叫notifyDataSetChanged（）設置適配器後的ListView 即

adapter=new LazyAdapter(this, nomineeList) 
     n_list.setAdapter(adapter); 
    adapter.notifyDataSetChanged();

因爲您呼叫notifyDataSetChanged（），即使沒有任何改變在你的LazyAdapter數據中

adapter=new LazyAdapter(this, nomineeList); 
     adapter.notifyDataSetChanged();

notifyDataSetChanged() - 將通知listview通知，適配器中的數據已更改。當你試圖在已經綁定到listView的Adapter上調用notifyDataSetChanged（）時，這會拋出這個異常。

java.lang.IllegalStateException：適配器的內容已更改，但ListView未收到通知。確保適配器的內容不會從後臺線程修改，而只能從UI線程修改。

來源

2013-03-31 14:27:30 Pragnani

謝謝，提出了建議的更改，但仍然得到相同的錯誤。 – hypd09

@spexy發佈您的更新代碼...並檢查我最近的編輯..？ – Pragnani

添加了更新的代碼，也從onPostExecute（）中刪除了adapter.notifyDataSetChanged（）（我應該？）。不知道爲什麼，但崩潰的頻率已經降低。難道是因爲數據庫查詢需要時間嗎？ – hypd09

因notifyDataSetChanged（）問題導致的隨機崩潰

回答

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