CameraFlash手电筒

有时候晚上找不到电棒，电灯，咱们可以写个小程序，利用照相机的闪光灯临时顶替
上代码：

 1 package com.linux.cameraflash;

 import android.hardware.Camera;
 import android.hardware.Camera.Parameters;
 import android.os.Bundle;
 import android.app.Activity;
 import android.view.Menu;
 import android.view.View;
 import android.widget.TextView;
 import android.widget.Toast;

 public class MainActivity extends Activity {
     private boolean isOpen=false;
     private Camera camera;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         TextView img=(TextView)findViewById(R.id.img);
         img.setOnClickListener(new View.OnClickListener() {
             //TextView上放一张图片，点击图片打开闪光灯
             @Override
             public void onClick(View arg0) {
                 // TODO Auto-generated method stub
                 if(!isOpen){
                     Toast.makeText(getApplicationContext(),
                             "您已打开了手电筒", Toast.LENGTH_LONG).show();
                     camera=Camera.open();
                     Parameters params=camera.getParameters();
                     params.setFlashMode(Parameters.FLASH_MODE_TORCH);
                     camera.setParameters(params);
                     camera.startPreview();//start flash!
                     isOpen=true;
                 }else{
                     Toast.makeText(getApplicationContext(),
                             "已关闭", Toast.LENGTH_SHORT).show();
                     camera.stopPreview();//关掉闪光灯
                     camera.release();//关掉照相机
                     isOpen=false;
                 }
             }
         });
     }

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
         //getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }

 }

再在manifest中加入权限：

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

上述代码在我的4.2系统上运行良好，不知在其他厂商手机上怎么样