Question

我已经在arraylist上实现了删除操作
```
voiceUrl_list.remove(position);
```
我用过listvoice.invalidateViews（）; //导致重建所有视图并重新绘制！

它会刷新视图，并显示一次，但在进一步点击时，应用程序会崩溃。

这是代码！

convertView.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {



                    voiceURL=voiceUrl_list.get(position);


                    Log.i("_voice_url_clicked_"," "+voiceURL);  
                    toast = null;
                    try 
                    {
                        player.setDataSource(voiceURL); // setup song from http://www.hrupin.com/wp-content/uploads/mp3/testsong_20_sec.mp3 URL to mediaplayer data source

                        player.prepare(); // you must call this method after setup the datasource in setDataSource method. After calling prepare() the instance of MediaPlayer starts load data from URL to internal buffer.
                    } 
                    catch (Exception e) 
                    {
                        e.printStackTrace();
                    }
                    if(!player.isPlaying())
                    {
                        player.start();
                        Toast.makeText(Call_In_Out.this,"Playing Audio ...",5000).show();

                       Log.i("response is"," uu"+a);


                    }
                    else 
                    {
                        player.pause();

                        Log.e("Pause ***","Inside Else Block***********PAUSE");
                    }   

                    player.setOnCompletionListener(new
                            OnCompletionListener() {

           @Override


 public void onCompletion(MediaPlayer arg0) {

                                              Toast.makeText(getApplicationContext(),"Finished Playing",2000).show();



                                              voiceURL=voiceUrl_list.get(position);



//removing the arraylist entries                                    

                                                voiceUrl_list.remove(position);

                                                listvoice.invalidateViews(); // causes all the views to be rebuilt and redrawn !


                                         }
                                      });

Logcat中显示错误：

04-17 07:42:42.898: E/AndroidRuntime(5676): FATAL EXCEPTION: main
04-17 07:42:42.898: E/AndroidRuntime(5676): java.lang.NullPointerException
04-17 07:42:42.898: E/AndroidRuntime(5676):     at com.zoemultiline.call.Call_In_Out$ListVoiceAdapter$1.onClick(Call_In_Out.java:427)
04-17 07:42:42.898: E/AndroidRuntime(5676):     at android.view.View.performClick(View.java:4204)
04-17 07:42:42.898: E/AndroidRuntime(5676):     at android.view.View$PerformClick.run(View.java:17355)
04-17 07:42:42.898: E/AndroidRuntime(5676):     at android.os.Handler.handleCallback(Handler.java:725)
04-17 07:42:42.898: E/AndroidRuntime(5676):     at android.os.Handler.dispatchMessage(Handler.java:92)
04-17 07:42:42.898: E/AndroidRuntime(5676):     at android.os.Looper.loop(Looper.java:137)
04-17 07:42:42.898: E/AndroidRuntime(5676):     at android.app.ActivityThread.main(ActivityThread.java:5041)
04-17 07:42:42.898: E/AndroidRuntime(5676):     at java.lang.reflect.Method.invokeNative(Native Method)
04-17 07:42:42.898: E/AndroidRuntime(5676):     at java.lang.reflect.Method.invoke(Method.java:511)
04-17 07:42:42.898: E/AndroidRuntime(5676):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-17 07:42:42.898: E/AndroidRuntime(5676):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-17 07:42:42.898: E/AndroidRuntime(5676):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

只需更新填充列表视图的数组或数据，然后调用下面的方法。

YOUR_ADAPTER.notifyDataSetChanged();

希望它会对你有所帮助。

Answer 2

要刷新列表视图，请更新作为其基础的阵列（或其他数据结构）。然后在适配器上调用notifyDataSetChanged以获取列表。

如何多次刷新Android列表视图？

2 个答案: