我已经在arraylist上实现了删除操作
voiceUrl_list.remove(position);我用过 listvoice.invalidateViews(); // 导致所有视图被重建和重绘！
它刷新视图，并显示一次，但在进一步单击时，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中显示的错误：
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)