Android 打开闪光灯（手电筒）

package com.example.openBackLight;import android.app.Activity;import android.hardware.Camera;import android.os.Bundle;import android.view.View;import android.hardware.Camera.Parameters;import android.widget.Button;public class MyActivity extends Activity {    private Button button;    private Camera camera;    private Parameters parameters;    public boolean hasClosed = true; // 定义开关状态，状态为false，打开状态，状态为true，关闭状态    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                button = (Button) findViewById(R.id.button);    }    public void toggleLight(View view) {        if (hasClosed) {            camera = Camera.open();            parameters = camera.getParameters();            parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);// 开启            camera.setParameters(parameters);            button.setText("关闭闪光灯");            hasClosed = false;        } else {            parameters.setFlashMode(Parameters.FLASH_MODE_OFF);// 关闭            camera.setParameters(parameters);            button.setText("开启闪光灯");            hasClosed = true;            camera.release();        }    }    }

布局文件很简单，就一个button，点击的时候会调用toggleLight()方法.

要加入以下权限：

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

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