我有一个名为runner的线程。我想停止这个线程onBackPressed但这不会发生。这是代码：
public class StrobeLightConfig extends Activity {
Camera cam;
StrobeRunner runner;
Thread bw;
CheckBox strobe;
private boolean isFlashOn;
private boolean hasFlash;
private Parameters params;
private MediaPlayer mp;
VerticalSeekBar skbar, skbaroff;
ToggleButton togglebutton;
public final Handler mHandler = new Handler();
public final Runnable mShowToastRunnable = new Runnable() {
public void run() {
showMessage();
}
};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
skbar = (VerticalSeekBar) findViewById(R.id.SeekBar01);
strobe = (CheckBox) findViewById(R.id.checkBox1);
togglebutton = (ToggleButton) findViewById(R.id.ToggleButton01);
skbaroff = (VerticalSeekBar) findViewById(R.id.SeekBar02);
hasFlash = getApplicationContext().getPackageManager()
.hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
turnOnFlash();
strobe.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (buttonView.isChecked()) {
cam.release();
Toast.makeText(getApplicationContext(), "Released 1", 0)
.show();
} else {
cam.release();
Toast.makeText(getApplicationContext(), "Released 2", 0)
.show();
}
}
});
runner = StrobeRunner.getInstance();
runner.controller = this;
if (runner.isRunning) {
} else {
try {
if (cam == null) {
cam = Camera.open();
}
} catch (RuntimeException ex) {
togglebutton.setEnabled(false);
TextView t = (TextView) findViewById(R.id.TextViewHW2);
t.setText(R.string.nocamera);
Toast.makeText(getApplicationContext(),
"Error connecting to camera flash.", Toast.LENGTH_LONG)
.show();
return;
}
}
togglebutton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// Perform action on clicks
if (strobe.isChecked()) {
if (togglebutton.isChecked()) {
turnOnStrobe();
} else {
turnOffStrobe();
}
} else {
if (isFlashOn) {
// turn off flash
turnOffFlash();
} else {
----------------- runner.requeststop working here---------------------
turnOnFlash();
}
}
}
});
skbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
runner.delay = progress;
}
});
skbaroff.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
runner.delayoff = progress;
}
});
}
private void getCamera() {
if (cam == null) {
try {
cam = Camera.open();
params = cam.getParameters();
} catch (RuntimeException e) {
Log.e("Camera Error. Failed to Open. Error: ", e.getMessage());
}
}
}
/*
* Turning On flash
*/
private void turnOnFlash() {
if (!isFlashOn) {
togglebutton.setChecked(true);
cam = Camera.open();
params = cam.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_TORCH);
cam.setParameters(params);
cam.startPreview();
isFlashOn = true;
strobe.setEnabled(false);
}
}
private void turnOffFlash() {
if (isFlashOn) {
togglebutton.setChecked(false);
params = cam.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_OFF);
cam.setParameters(params);
cam.stopPreview();
cam.release();
isFlashOn = false;
strobe.setEnabled(true);
}
}
private void turnOnStrobe() {
if (!isFlashOn) {
strobe.setEnabled(false);
bw = new Thread(runner);
bw.start();
}
}
private void turnOffStrobe() {
if (isFlashOn) {
runner.requestStop = true;
strobe.setEnabled(true);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
}
@Override
protected void onPause() {
super.onPause();
}
@Override
protected void onRestart() {
super.onRestart();
}
public void showMessage() {
String err = runner.errorMessage;
runner.errorMessage = "";
if (!err.equals("")) {
Context context = getApplicationContext();
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, err, duration);
toast.show();
}
ToggleButton togglebutton = (ToggleButton) findViewById(R.id.ToggleButton01);
togglebutton.setChecked(false);
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
super.onBackPressed();
if (strobe.isChecked()) {
turnOffStrobe();
} else {
if (isFlashOn) {
----------------- runner.requeststop needs to work here---------------------
turnOffFlash();
finish();
moveTaskToBack(true);
}
}
}
}
但是，如果我写
runner.requestStop = true;
strobe.setEnabled(true);
在oncreate（而不是onBackPressed）的TurnoffStrobe所在地，它正在工作。如果 runner.requeststop 在onCreate外工作，我该怎么做？
答案 0 :(得分：0)
尝试 onBackpress（）中的 your_thread.isInterrupted（）;