Android Control Flash (控制闪关灯)

最新推荐文章于 2025-04-28 15:27:03 发布

Lee_Amazine

最新推荐文章于 2025-04-28 15:27:03 发布

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分类专栏： Android

本文链接：https://blog.youkuaiyun.com/Lee_Amazine/article/details/18225237

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本文介绍了如何在Android应用中添加权限并控制相机的闪光灯。通过添加'android.permission.FLASHLIGHT'、'android.permission.CAMERA'和'android.hardware.camera'权限，可以实现对设备闪光灯的使用。参考链接提供了详细教程。

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权限添加：

<uses-permissionandroid:name="android.permission.FLASHLIGHT"/>

<uses-permissionandroid:name="android.permission.CAMERA"/>

<uses-permissionandroid:name="android.hardware.camera"/>

public void onControlFlash(View view) {
		Log.i(infoStr, "start flash switch");
		if (!open) {
			turnLightOn();
		} else {
			turnLightOff();
		}
	}

	public void turnLightOn() {
		camera = Camera.open();

		if (camera == null) {
			Log.e(errorStr, "Not support Camera");
			return;
		}
		Parameters parameters = camera.getParameters();
		if (parameters == null) {
			Log.e(errorStr, "get camera parameters failed");
			return;
		}
		List<String> flashModesList = parameters.getSupportedFlashModes();
		// Check if camera flash exists
		if (flashModesList == null) {
			Log.e(errorStr, "camera flash not exists");
			return;
		}
		String flashMode = parameters.getFlashMode();
		Log.i(infoStr, "The flashMode is " + flashMode);
		if (!Parameters.FLASH_MODE_TORCH.equals(flashMode)
				&& flashModesList.contains(Parameters.FLASH_MODE_TORCH)) {
			// Turn on the flash
			parameters.setFlashMode(Parameters.FLASH_MODE_TORCH); // open
			camera.setParameters(parameters);
			open = true;
		} else {
			Log.e(errorStr, "Current status is open or not support flash");
			return;
		}
	}

	public void turnLightOff() {
		if (camera == null) {
			Log.e(errorStr, "Not support Camera");
			return;
		}
		Parameters parameters = camera.getParameters();
		if (parameters == null) {
			Log.e(errorStr, "get camera parameters failed");
			return;
		}
		List<String> flashModesList = parameters.getSupportedFlashModes();
		// Check if camera flash exists
		if (flashModesList == null) {
			Log.e(errorStr, "camera flash not exists");
			return;
		}
		String flashMode = parameters.getFlashMode();
		if (!Parameters.FLASH_MODE_OFF.equals(flashMode)
				&& flashModesList.contains(Parameters.FLASH_MODE_OFF)) {
			// Turn off the flash
			parameters.setFlashMode(Parameters.FLASH_MODE_OFF); // open
			camera.setParameters(parameters);
			camera.release();
			open = false;
		} else {
			Log.e(errorStr, "Current status is off or not support camera");
			return;
		}
	}

Reference

http://bbs.youkuaiyun.com/topics/390212391

http://www.cnblogs.com/xingfuzzhd/p/3360633.html