我正在尝试创建一个具有频闪效果的手电筒应用。我的目标是我可以通过开关Btn打开/关闭手电筒,并使用搜索栏增加选通频率。如果搜索条值为0且开关Btn为ON,则手电筒应为ON(没有任何选通)。但是如果seekbar值为0,它现在仍然闪烁(选通效果ON)。你知道我怎么能改变它吗? 以下是一些我认为很重要的代码(我真的无法找到能够保持stobe效果的部分:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mySwitch = (Switch) findViewById(R.id.mySwitch);
//listener to check changes in state
mySwitch.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
turnOnOff(isChecked);
}
});
skBar = (SeekBar) findViewById(R.id.seekBar);
skBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
freq = progress;
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
}
@Override
protected void onResume() {
super.onResume();
try {
cam = Camera.open();
camParams = cam.getParameters();
cam.startPreview();
hasCam = true;
}catch(Exception e){
}
}
private void turnOnOff(boolean on){
if(on) {
if(freq != 0){
sr = new StroboRunner();
t = new Thread(sr);
t.start();
return;
}else{
camParams.setFlashMode(Parameters.FLASH_MODE_TORCH);
}
}else if(!on){
if(t != null){
sr.stopRunning = true;
t =null;
return;
}else{
camParams.setFlashMode(Parameters.FLASH_MODE_OFF);
}
}
cam.setParameters(camParams);
cam.startPreview();
}
private class StroboRunner implements Runnable {
boolean stopRunning = false;
@Override
public void run() {
Camera.Parameters paramsOn = cam.getParameters();
Camera.Parameters paramsOff = camParams;
paramsOn.setFlashMode(Parameters.FLASH_MODE_TORCH);
paramsOff.setFlashMode(Parameters.FLASH_MODE_OFF);
try {
while (!stopRunning) {
cam.setParameters(paramsOn);
cam.startPreview();
Thread.sleep(100 - freq);
cam.setParameters(paramsOff);
cam.startPreview();
Thread.sleep(100 - freq);
}
}catch(Exception e){
}
}
}
}