一起学android之如何以最简单方式开启闪光灯（35）

我们以360手机助手中有一款叫“最美手电筒”，效果图：

通过图中手电筒的开关来开启或关闭闪光灯，OK，以下是实现此功能的代码：

public class MainActivity extends Activity implements OnClickListener {
	private ImageView iv_off_on;
	private ImageView iv_light;
	private Parameters parameter = null;
	private Camera camera = null;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);
		initView();
		initListener();
	}

	private void initListener() {
		iv_off_on.setOnClickListener(this);
	}

	private void initView() {

		iv_off_on = (ImageView) findViewById(R.id.iv_off_on);
		iv_light = (ImageView) findViewById(R.id.iv_light);
		iv_light.setVisibility(View.INVISIBLE);

	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.iv_off_on:
			if (iv_off_on.isSelected()) {// 关闭
				iv_off_on.setSelected(false);
				iv_light.setVisibility(View.INVISIBLE);
				parameter.setFlashMode(Parameters.FLASH_MODE_OFF);
				camera.setParameters(parameter);
				camera.release();
			} else {// 开启
				iv_off_on.setSelected(true);
				iv_light.setVisibility(View.VISIBLE);
				camera = Camera.open();
				camera.startPreview();
				parameter = camera.getParameters();
				parameter.setFlashMode(Parameters.FLASH_MODE_TORCH);
				camera.setParameters(parameter);
			}

			break;

		default:
			break;
		}
	}

}

最后在AndroidManifest.xml中添加相应的权限：

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

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

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

<uses-feature android:name="android.hardware.autofocus" />

转载请注明出处：http://blog.csdn.net/hai_qing_xu_kong/article/details/45504303情绪控_