打开相机 led灯，作为手电筒

发布时间：2020-12-15 06:11:44 所属栏目：百科来源：网络整理

导读：For this you should do like : Check whether flash light isavailable or not ? If yes then Turn Off/On If no then you can do whatever according to your app.needs For Checking availability of flash in device: You can use the following ?contex

For this you should do like :

Check whether flash light isavailable or not ?
If yes then Turn Off/On
If no then you can do whatever according to your app.needs

For Checking availability of flash in device:

You can use the following

?context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)

which will return true if a flash is available,false if not.

See http://developer.android.com/reference/android/content/pm/PackageManager.html for more information.

?? Camera mCamera =? null;
?? ?boolean mbTorchEnabled = false;???

public void openflashlight(View v) {
		// Here are class declarations
		Camera.Parameters mParameters;
		if (mCamera == null)
			mCamera = Camera.open();
		// This one is inside my OnClickListener
		if (v.getId() == R.id.flashlight) {
			mParameters = mCamera.getParameters();
			if (mbTorchEnabled) {
				mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
				mCamera.stopPreview();
				mCamera.release();
				mCamera = null;
			} else {
				mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
				mCamera.setParameters(mParameters);
				mCamera.startPreview();
			}
			mbTorchEnabled = !mbTorchEnabled;
		}
	}

??? <uses-permission android:name="android.permission.CAMERA" /> ??? <uses-feature android:name="android.hardware.camera" /> ??? <uses-feature android:name="android.hardware.camera.autofocus" />

（编辑：李大同）

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