Android platform flashlight development source code

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/**
 * name   : 手电筒主界面
 * author : [email protected]
 * date    : 2012-12-21 15:50:17
 */
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="http://schemas.android.com/apk/res/android"
    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="http://schemas.android.com/apk/res/android"
    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>

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