我正在开发一个游戏，除了作为 imageView 的武器之外，还有两个活动，即相机表面视图和开火按钮。这两个活动具有相同的代码。在活动之间切换几次后，应用程序崩溃。这是我的代码，下面是堆栈跟踪：
public class MainActivity extends Activity implements SurfaceHolder.Callback,OnClickListener {
Camera mCamera;
SurfaceView mPreview;
Button shoot;
TextView rounds;
int shootsound;
int reloadsound;
int music;
SoundPool spool;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new TapContextSDK(getApplicationContext()).initialize();
new TapContextSDK(getApplicationContext()).showAd();
mPreview = (SurfaceView)findViewById(R.id.preview);
mPreview.getHolder().addCallback(this);
mPreview.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
mCamera = Camera.open();
shoot=(Button)findViewById(R.id.button1);
shoot.setOnClickListener(this);
rounds=(TextView)findViewById(R.id.textView1);
this.setVolumeControlStream(AudioManager.STREAM_MUSIC);
spool = new SoundPool(1, AudioManager.STREAM_MUSIC, 0);
shootsound= spool.load(this, R.raw.shoot, 2);
reloadsound= spool.load(this, R.raw.reload, 2);
music= spool.load(this, R.raw.music, 2);
new TapContextSDK(getApplicationContext()).initialize();
new TapContextSDK(getApplicationContext()).showAd();
}
@Override
public void onPause() {
super.onPause();
mCamera.stopPreview();
}
@Override
public void onDestroy() {
super.onDestroy();
mCamera.release();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Parameters parameters = mCamera.getParameters();
List<Camera.Size> previewSizes = parameters.getSupportedPreviewSizes();
Camera.Size previewSize = previewSizes.get(4); //480h x 720w
parameters.setPreviewSize(previewSize.width, previewSize.height);
parameters.setFlashMode(Parameters.FLASH_MODE_AUTO);
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
mCamera.setParameters(parameters);
Display display = ((WindowManager)getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
if(display.getRotation() == Surface.ROTATION_0) {
mCamera.setDisplayOrientation(90);
} else if(display.getRotation() == Surface.ROTATION_270) {
mCamera.setDisplayOrientation(180);
}
mCamera.startPreview();
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
mCamera.setPreviewDisplay(mPreview.getHolder());
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
Log.i("PREVIEW","surfaceDestroyed");
}
public void shoot(){
AudioManager audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
float volume = (float) audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
spool.play(shootsound, volume, volume, 1, 0, 1f);
}
public void reload(){
AudioManager audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
float volume = (float) audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
spool.play(reloadsound, volume, volume, 1, 0, 1f);
}
public void music(){
AudioManager audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
float volume = (float) audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
spool.play(music, volume, volume, 1, 0, 1f);
}
public void vibrateMe() {
Vibrator vibrate = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);
vibrate.vibrate(100);
}
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
switch(arg0.getId()) {
case R.id.button1:
int tmp = Integer.valueOf( rounds.getText().toString());
if(tmp==0)
{
rounds.setText("12");
reload();
}
else
{
shoot();
vibrateMe();
rounds.setText( String.valueOf( tmp-1) );
}
break;
}
}}
堆栈跟踪：
07-11 17:42:15.241: E/AndroidRuntime(28651): FATAL EXCEPTION: main
07-11 17:42:15.241: E/AndroidRuntime(28651): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.jouni.camsniper/com.jouni.camsniper.Machinegun}: java.lang.RuntimeException: Fail to connect to camera service
07-11 17:42:15.241: E/AndroidRuntime(28651): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2194)
07-11 17:42:15.241: E/AndroidRuntime(28651): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2229)
07-11 17:42:15.241: E/AndroidRuntime(28651): at android.app.ActivityThread.access$600(ActivityThread.java:139)
07-11 17:42:15.241: E/AndroidRuntime(28651): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1261)
07-11 17:42:15.241: E/AndroidRuntime(28651): at android.os.Handler.dispatchMessage(Handler.java:99)
07-11 17:42:15.241: E/AndroidRuntime(28651): at android.os.Looper.loop(Looper.java:154)
07-11 17:42:15.241: E/AndroidRuntime(28651): at android.app.ActivityThread.main(ActivityThread.java:4945)
07-11 17:42:15.241: E/AndroidRuntime(28651): at java.lang.reflect.Method.invokeNative(Native Method)
07-11 17:42:15.241: E/AndroidRuntime(28651): at java.lang.reflect.Method.invoke(Method.java:511)
07-11 17:42:15.241: E/AndroidRuntime(28651): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-11 17:42:15.241: E/AndroidRuntime(28651): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-11 17:42:15.241: E/AndroidRuntime(28651): at dalvik.system.NativeStart.main(Native Method)
07-11 17:42:15.241: E/AndroidRuntime(28651): Caused by: java.lang.RuntimeException: Fail to connect to camera servicef
07-11 17:42:15.241: E/AndroidRuntime(28651): at android.hardware.Camera.native_setup(Native Method)
07-11 17:42:15.241: E/AndroidRuntime(28651): at android.hardware.Camera.<init>(Camera.java:307)
07-11 17:42:15.241: E/AndroidRuntime(28651): at android.hardware.Camera.open(Camera.java:283)
07-11 17:42:15.241: E/AndroidRuntime(28651): at com.jouni.camsniper.Machinegun.onCreate(Machinegun.java:52)
07-11 17:42:15.241: E/AndroidRuntime(28651): at android.app.Activity.performCreate(Activity.java:4531)
07-11 17:42:15.241: E/AndroidRuntime(28651): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071)
07-11 17:42:15.241: E/AndroidRuntime(28651): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2150)
07-11 17:42:15.241: E/AndroidRuntime(28651): ... 11 more
07-11 17:42:18.924: D/Process(28651): killProcess, pid=28651
任何建议如何使应用程序更稳定（无崩溃）？