Android 点击按钮使LED灯发出频闪光
我已经做了一个手电筒应用程序,我想尝试做一个附加组件来允许闪光灯功能 我想把它设置在一个不同的按钮上,而不是同一个。我想我需要使用计时器,但我从来没有使用过计时器,因为我是java新手 以下是我的手电筒代码:Android 点击按钮使LED灯发出频闪光,android,eclipse,led,flashlight,Android,Eclipse,Led,Flashlight,我已经做了一个手电筒应用程序,我想尝试做一个附加组件来允许闪光灯功能 我想把它设置在一个不同的按钮上,而不是同一个。我想我需要使用计时器,但我从来没有使用过计时器,因为我是java新手 以下是我的手电筒代码: public class FlashLightActivity extends Activity { private boolean isLighOn = false; private Camera camera; private Button button; @Override p
public class FlashLightActivity extends Activity {
private boolean isLighOn = false;
private Camera camera;
private Button button;
@Override
protected void onStop() {
super.onStop();
if (camera != null) {
camera.release();
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
button = (Button) findViewById(R.id.buttonFlashlight);
Context context = this;
PackageManager pm = context.getPackageManager();
if (!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
Log.e("err", "Device has no camera!");
return;
}
camera = Camera.open();
final Parameters p = camera.getParameters();
button.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
if (isLighOn) {
Log.i("info", "torch is turn off!");
p.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(p);
camera.stopPreview();
isLighOn = false;
} else {
Log.i("info", "torch is turn on!");
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(p);
camera.startPreview();
isLighOn = true;
}
}
});
}
}
你可以用一个处理器
public class Strobe extends Activity {
private LinearLayout mLinearLayout;
private Handler mHander = new Handler();
private boolean mActive = false;
private boolean mSwap = true;
private final Runnable mRunnable = new Runnable() {
public void run() {
if (mActive) {
if (mSwap) {
mLinearLayout.setBackgroundColor(Color.WHITE);
mSwap = false;
mHander.postDelayed(mRunnable, 20);
} else {
mLinearLayout.setBackgroundColor(Color.BLACK);
mSwap = true;
mHander.postDelayed(mRunnable, 100);
}
}
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mLinearLayout = (LinearLayout) findViewById(R.id.strobe);
startStrobe();
}
private void startStrobe() {
mActive = true;
mHander.post(mRunnable);
}
}
为活动设置主题以使其全屏显示
android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
你可以用一个处理器
public class Strobe extends Activity {
private LinearLayout mLinearLayout;
private Handler mHander = new Handler();
private boolean mActive = false;
private boolean mSwap = true;
private final Runnable mRunnable = new Runnable() {
public void run() {
if (mActive) {
if (mSwap) {
mLinearLayout.setBackgroundColor(Color.WHITE);
mSwap = false;
mHander.postDelayed(mRunnable, 20);
} else {
mLinearLayout.setBackgroundColor(Color.BLACK);
mSwap = true;
mHander.postDelayed(mRunnable, 100);
}
}
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mLinearLayout = (LinearLayout) findViewById(R.id.strobe);
startStrobe();
}
private void startStrobe() {
mActive = true;
mHander.post(mRunnable);
}
}
为活动设置主题以使其全屏显示
android:theme="@android:style/Theme.NoTitleBar.Fullscreen"