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