Android Camera开发手电筒功能

package com.android.app;import android.app.Activity;import android.hardware.Camera;import android.hardware.Camera.Parameters;import android.os.Bundle;import android.view.View;import android.widget.TextView;import android.widget.Toast; public class Main extends Activity { private boolean isopent = false; private Camera camera;  @Override protected void onCreate(Bundle savedInstanceState) {  // TODO Auto-generated method stub  super.onCreate(savedInstanceState);  View view = View.inflate(this, R.layout.main, null);  setContentView(view);  TextView img_but = (TextView) findViewById(R.id.main_img);  img_but.setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View v) {    // TODO Auto-generated method stub    if (!isopent) {     Toast.makeText(getApplicationContext(), "您已经打开了手电筒", 0)       .show();     camera = Camera.open();     Parameters params = camera.getParameters();     params.setFlashMode(Parameters.FLASH_MODE_TORCH);     camera.setParameters(params);     camera.startPreview(); // 开始亮灯     isopent = true;    } else {     Toast.makeText(getApplicationContext(), "关闭了手电筒",       Toast.LENGTH_SHORT).show();     camera.stopPreview(); // 关掉亮灯     camera.release(); // 关掉照相机     isopent = false;    }   }  }); } }

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="<a href="http://schemas.android.com/apk/res/android"" rel="nofollow" target="_blank">http://schemas.android.com/apk/res/android"</a> android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" >  <TextView  android:id="@+id/main_img"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:background="@drawable/main_body"> </TextView></LinearLayout>

<manifest xmlns:android="<a href="http://schemas.android.com/apk/res/android"" rel="nofollow" target="_blank">http://schemas.android.com/apk/res/android"</a> package="com.android.app" android:versionCode="1" android:versionName="1.0" >  <uses-sdk  android:minSdkVersion="8"  android:targetSdkVersion="15" /> <application  android:icon="@drawable/ic_launcher"  android:label="@string/app_name"  android:theme="@style/AppTheme" >  <activity android:name=".AppStart" >   <intent-filter>    <action android:name="android.intent.action.MAIN" />     <category android:name="android.intent.category.LAUNCHER" />   </intent-filter>  </activity>  <activity android:name=".Main" >  </activity> </application> <!-- 摄像头、手电筒 --> <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.camera.autofocus" /> <uses-feature android:name="android.hardware.camera.flash" /> </manifest>