我正在尝试创建一个包含频闪功能的闪光灯应用程序。我已经成功实现了闪光灯开/关效果，但我遇到了频闪效果问题。每当我尝试创建频闪效果时，应用程序就会崩溃。如果我删除它，它工作正常。
我有一项活动，seekbar顶部是 a，中间是开/关开关。我想要实现的是，如果用户单击开/关按钮，如果seekbar顶部为 0，则闪光灯应打开/关闭。如果用户增加seekbar闪光灯中的值，则应开始相应地频闪，如果用户将值移回 0 手电筒应保持不变。请帮我修复错误。
日志猫
07-23 16:54:12.610: W/dalvikvm(21210): threadid=11: thread exiting with uncaught exception (group=0x40c15a68)
07-23 16:54:12.610: E/AndroidRuntime(21210): FATAL EXCEPTION: Thread-2373
07-23 16:54:12.610: E/AndroidRuntime(21210): java.lang.RuntimeException: Fail to connect to camera service
07-23 16:54:12.610: E/AndroidRuntime(21210): at android.hardware.Camera.native_setup(Native Method)
07-23 16:54:12.610: E/AndroidRuntime(21210): at android.hardware.Camera.<init>(Camera.java:365)
07-23 16:54:12.610: E/AndroidRuntime(21210): at android.hardware.Camera.open(Camera.java:340)
07-23 16:54:12.610: E/AndroidRuntime(21210): at com.shyam.flashlight.StrobeController.run(StrobeController.java:29)
07-23 16:54:12.610: E/AndroidRuntime(21210): at java.lang.Thread.run(Thread.java:856)
手电筒.java
public class FlashLight extends Activity {
ImageButton btnSwitch;
private Camera camera;
private boolean isFlashOn;
private boolean hasFlash;
Parameters params;
MediaPlayer mp;
StrobeController runner;
Thread bw;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_flash_light);
btnSwitch = (ImageButton) findViewById(R.id.btnSwitch);
runner = StrobeController.getInstance();
bw = new Thread(runner);
bw.start();
hasFlash = getApplicationContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
if (!hasFlash) {
AlertDialog alert = new AlertDialog.Builder(FlashLight.this).create();
alert.setTitle("Error");
alert.setMessage("Sorry, your device doesn't support flash light!");
alert.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
alert.show();
return;
}
getCamera();
toggleButtonImage();
btnSwitch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
/*if (isFlashOn) {
turnOffFlash();
} else {
turnOnFlash();
}*/
if (isFlashOn) {
bw = new Thread(runner);
bw.start();
isFlashOn = false;
} else {
isFlashOn = true;
runner.requestStop = true;
}
}
});
final SeekBar skbar = (SeekBar) findViewById(R.id.volume_bar);
skbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) { }
@Override
public void onStartTrackingTouch(SeekBar seekBar) { }
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
runner.delay = 101 - progress;
runner.delayoff = 101 - progress;
}
});
}
private void getCamera() {
if (camera == null) {
try {
camera = Camera.open();
params = camera.getParameters();
} catch (RuntimeException e) {
Log.e("Camera Error. Failed to Open. Error: ", e.getMessage());
}
}
}
private void turnOnFlash() {
if (!isFlashOn) {
if (camera == null || params == null) {
return;
}
playSound();
params = camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(params);
camera.startPreview();
isFlashOn = true;
toggleButtonImage();
}
}
private void turnOffFlash() {
if (isFlashOn) {
if (camera == null || params == null) {
return;
}
playSound();
params = camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(params);
camera.stopPreview();
isFlashOn = false;
toggleButtonImage();
}
}
private void playSound() {
if (isFlashOn) {
mp = MediaPlayer.create(FlashLight.this, R.raw.light_switch_off);
} else {
mp = MediaPlayer.create(FlashLight.this, R.raw.light_switch_on);
}
mp.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
mp.release();
}
});
mp.start();
}
private void toggleButtonImage() {
if (isFlashOn) {
btnSwitch.setImageResource(R.drawable.btn_switch_on);
} else {
btnSwitch.setImageResource(R.drawable.btn_switch_off);
}
}
@Override
public void onBackPressed() {
super.onBackPressed();
params = camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(params);
camera.stopPreview();
isFlashOn = false;
if (camera != null) {
camera.release();
camera = null;
}
Log.d("Camera", "Back Pressed");
}
}
频闪控制器.java
public class StrobeController implements Runnable {
protected StrobeController() { }
public static StrobeController getInstance() {
return (instance == null ? instance = new StrobeController() : instance);
}
private static StrobeController instance;
public volatile boolean requestStop = false;
public volatile boolean isRunning = false;
public volatile int delay = 10;
public volatile int delayoff = 500;
public volatile String errorMessage = "";
@Override
public void run() {
if (isRunning)
return;
requestStop = false;
isRunning = true;
Camera cam = Camera.open();
Parameters pon = cam.getParameters(), poff = cam.getParameters();
pon.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
poff.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
while (!requestStop) {
try {
cam.setParameters(pon);
Thread.sleep(delay);
cam.setParameters(poff);
Thread.sleep(delayoff);
} catch (InterruptedException ex) {
} catch (RuntimeException ex) {
requestStop = true;
errorMessage = "Error setting camera flash status. Your device may be unsupported.";
}
}
cam.release();
isRunning = false;
requestStop = false;
}
}