[英]Android app crashed when closing app using wakelock.release()
我有一个简单的闪光灯应用程序运行良好,但当用户关闭应用程序时,应用程序崩溃。 我认为问题出在唤醒锁上。
当闪光灯打开时,唤醒锁被打开,当闪光灯关闭时,唤醒锁被关闭。 这工作正常,但一旦用户按下或回家应用程序崩溃。
我的日志数据:
10-24 09:52:45.235:E / AndroidRuntime(6614):进程:r1d.org.uk.flashlight,PID:6614 10-24 09:52:45.235:E / AndroidRuntime(6614):java.lang.RuntimeException :无法销毁活动{r1d.org.uk.flashlight / r1d.org.uk.flashlight.MainActivity}:java.lang.RuntimeException:WakeLock欠锁MyWakelockTag 10-24 09:52:45.235:E / AndroidRuntime(6614) ):在android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3812)
主要活动:
public class MainActivity extends Activity {
private ImageView lightToggle;
private ImageButton lightSwitch;
Camera camera = null;
Parameters parameters;
Boolean isOn = false;
int lightON = R.drawable.on;
int lightOFF = R.drawable.off;
int switchON = R.drawable.switch_on;
int switchOFF = R.drawable.switch_off;
Boolean hasFlash;
PowerManager powerManager;
PowerManager.WakeLock wakeLock;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AdManager ads = new AdManager(this);
lightToggle = (ImageView) findViewById(R.id.lightOn);
lightSwitch = (ImageButton) findViewById(R.id.lightSwitch);
Context context = this;
hasFlash = context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
powerManager = (PowerManager) getSystemService(POWER_SERVICE);
wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyWakelockTag");
if(!hasFlash){
ContextThemeWrapper themedContext;
if ( Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ) {
themedContext = new ContextThemeWrapper( MainActivity.this, android.R.style.Theme_Holo_Light_Dialog_NoActionBar );
}
else {
themedContext = new ContextThemeWrapper( MainActivity.this, android.R.style.Theme_Light_NoTitleBar );
}
AlertDialog.Builder builder = new AlertDialog.Builder(themedContext);
builder.setTitle(getResources().getString(R.string.notsupported))
.setMessage(getResources().getString(R.string.notsupportedinfo))
.setIcon(android.R.drawable.ic_dialog_alert)
.setNegativeButton(getResources().getString(R.string.ok), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int i) {
dialog.cancel();
}
});
builder.show();
}
turnOn();
lightSwitch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(isOn){
turnOff();
} else {
turnOn();
}
}
});
}
private void turnOn(){
lightToggle.setImageDrawable(getResources().getDrawable(lightON));
lightSwitch.setImageDrawable(getResources().getDrawable(switchON));
wakeLock.acquire();
if(hasFlash) {
camera = Camera.open();
parameters = camera.getParameters();
parameters.setFlashMode(Parameters.FLASH_MODE_TORCH); //FLASH_MODE_ON
camera.setParameters(parameters);
}
isOn = true;
}
private void turnOff(){
lightToggle.setImageDrawable(getResources().getDrawable(lightOFF));
lightSwitch.setImageDrawable(getResources().getDrawable(switchOFF));
wakeLock.release();
if(hasFlash) {
parameters.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(parameters);
camera.release();
camera = null;
}
isOn = false;
}
@Override
public void onDestroy() {
turnOff();
super.onDestroy();
}
@Override
public void onPause(){
turnOff();
super.onPause();
}
@Override
public void onResume(){
turnOn();
super.onResume();
}
}
在onDestroy
你试图发布一个已经在onPause
发布的唤醒锁。 这应该工作:
if (wakeLock.isHeld()) {
wakeLock.release();
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.