问题描述
当我摆脱了Java文件中的状态栏时，这已经开始在我的应用程序中发生。 我使用手机的任务管理器关闭了该应用程序（我使用的是真实设备），然后在主屏幕上显示消息“我的应用程序已停止工作”。 我该怎么办？
Java文件
package interactive.siddiqui.survivor;
import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
public class Main extends Activity {
private MediaPlayer mediaPlayer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
mediaPlayer = MediaPlayer.create(this, R.drawable.background_musicmain);
mediaPlayer.start();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void sendMessage(View view)
{
Intent intent = new Intent(Main.this, GameView.class);
startActivity(intent);
onDestroy();
}
public void onDestroy() {
if (mediaPlayer.isPlaying()) {
mediaPlayer.stop();
}
mediaPlayer.release();
}
}
Logcat
07-28 01:06:05.389 2009-2009/? I/art﹕ Late-enabling -Xcheck:jni
07-28 01:06:05.673 2009-2009/interactive.siddiqui.survivor E/MediaPlayer﹕ Should have subtitle controller already set
07-28 01:06:05.680 2009-2030/interactive.siddiqui.survivor D/OpenGLRenderer﹕ Use EGL_SWAP_BEHAVIOR_PRESERVED: true
07-28 01:06:05.689 2009-2009/interactive.siddiqui.survivor D/Atlas﹕ Validating map...
07-28 01:06:05.701 2009-2009/interactive.siddiqui.survivor E/MediaPlayer﹕ Should have subtitle controller already set
07-28 01:06:05.739 2009-2030/interactive.siddiqui.survivor I/Adreno﹕ EGLInit: QTI Build: 03/04/15, eeab148,
07-28 01:06:05.749 2009-2030/interactive.siddiqui.survivor I/OpenGLRenderer﹕ Initialized EGL, version 1.4
07-28 01:06:05.750 2009-2030/interactive.siddiqui.survivor I/Adreno﹕ GetNativeFormatFromQctPixelFormat: Invalid qct format (611)
07-28 01:06:05.750 2009-2030/interactive.siddiqui.survivor I/Adreno﹕ GetNativeFormatFromQctPixelFormat: Invalid qct format (611)
07-28 01:06:05.750 2009-2030/interactive.siddiqui.survivor I/Adreno﹕ GetNativeFormatFromQctPixelFormat: Invalid qct format (611)
07-28 01:06:05.750 2009-2030/interactive.siddiqui.survivor I/Adreno﹕ GetNativeFormatFromQctPixelFormat: Invalid qct format (611)
07-28 01:06:05.750 2009-2030/interactive.siddiqui.survivor I/Adreno﹕ GetNativeFormatFromQctPixelFormat: Invalid qct format (612)
07-28 01:06:05.750 2009-2030/interactive.siddiqui.survivor I/Adreno﹕ GetNativeFormatFromQctPixelFormat: Invalid qct format (612)
07-28 01:06:05.750 2009-2030/interactive.siddiqui.survivor I/Adreno﹕ GetNativeFormatFromQctPixelFormat: Invalid qct format (612)
07-28 01:06:05.750 2009-2030/interactive.siddiqui.survivor I/Adreno﹕ GetNativeFormatFromQctPixelFormat: Invalid qct format (612)
07-28 01:06:05.757 2009-2030/interactive.siddiqui.survivor D/OpenGLRenderer﹕ Enabling debug mode 0
有什么建议么？
1楼
onDestroy被调用，并且可能遇到NullPointerException 。
将此检查添加为空：
public void onDestroy() {
if (mediaPlayer == null)
{ return; }
if (mediaPlayer.isPlaying()) {
mediaPlayer.stop();
}
mediaPlayer.release();
}