Android 手电源码

最近由于公司需要，做了一个手电筒，其实手电筒原理很简单，就是调用照相机的闪光灯，控制闪光灯的开关，就可以实现手电筒的效果，

强调一下，代码中一定要注意在结束的时候对闪光灯进行释放，否则就会导致使用照相机的时候出现——无法连接到相机 这个问题

手电筒APK下载地址：点击打开下载链接

手电筒项目源码下载：点击打开下载链接

主要代码如下：

package com.techainsh.flashlight;import java.util.List;import android.hardware.Camera;import android.hardware.Camera.Parameters;import android.os.Bundle;import android.os.Handler;import android.os.Looper;import android.os.Message;import android.os.PowerManager;import android.os.Vibrator;import android.app.Activity;import android.content.Context;import android.view.View;import android.view.View.OnClickListener;import android.widget.ImageView;import android.widget.RelativeLayout;import android.widget.Toast;public class MainActivity extends Activity implements OnClickListener {	public ImageView btnimageView = null;	public RelativeLayout bgmageView = null;	private Camera camera;	private boolean isOpen = true;	public final static int OPEN_CAMERA = 1011;	public final static int OPEN_LIGHT = 1012;	public final static int CLOSE_LIGHT = 1013;	private Vibrator vibrator;	long[] pattern = { 100, 200 };	PowerManager.WakeLock wakeLock;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);		handler.sendEmptyMessage(OPEN_CAMERA);		vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);		btnimageView = (ImageView) findViewById(R.id.btn_image);		bgmageView = (RelativeLayout) findViewById(R.id.bg_image);		bgmageView.setBackgroundResource(R.drawable.bg_flashlight_off);		btnimageView.setImageResource(R.drawable.btn_flash_light_off);		btnimageView.setOnClickListener(this);		bgmageView.setBackgroundResource(R.drawable.bg_flashlight_on);		btnimageView.setImageResource(R.drawable.btn_flash_light_on);		handler.sendEmptyMessage(OPEN_LIGHT);		vibrator.vibrate(pattern, -1);	}	Handler handler = new Handler(Looper.getMainLooper()) {		@Override		public void handleMessage(Message msg) {			switch (msg.what) {			case OPEN_CAMERA:				camera = Camera.open();				break;			case OPEN_LIGHT:				Parameters params = camera.getParameters();				List<String> list = params.getSupportedFlashModes();				if (list.contains(Parameters.FLASH_MODE_TORCH)) {					params.setFlashMode(Parameters.FLASH_MODE_TORCH);				} else {					Toast.makeText(getApplicationContext(), "此设备不支持闪光灯模式",							Toast.LENGTH_SHORT).show();				}				camera.setParameters(params);				camera.startPreview();				isOpen = true;				break;			case CLOSE_LIGHT:				if (isOpen) {					Parameters closepParameters = camera.getParameters();					closepParameters							.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);					camera.setParameters(closepParameters);					camera.stopPreview();					// camera.release();					isOpen = false;					// sendEmptyMessage(OPEN_CAMERA);				}				break;			default:				break;			}		}	};	@Override	protected void onDestroy() {		super.onDestroy();		if (null != camera) {			camera.release();			camera = null;		}	}	public void onStop() {		super.onStop();		vibrator.cancel();		if (null != camera) {			camera.release();			camera = null;		}		MainActivity.this.finish();	}	@Override	protected void onResume() {		// TODO Auto-generated method stub		super.onResume();		PowerManager pm = (PowerManager) getSystemService(POWER_SERVICE);		wakeLock = pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK				| PowerManager.ON_AFTER_RELEASE, "test");		wakeLock.acquire();	}	@Override	protected void onPause() {		// TODO Auto-generated method stub		super.onPause();		if (wakeLock != null)			wakeLock.release();	}	@Override	public void onClick(View v) {		switch (v.getId()) {		case R.id.btn_image:			if (isOpen) {				bgmageView.setBackgroundResource(R.drawable.bg_flashlight_off);				btnimageView.setImageResource(R.drawable.btn_flash_light_off);				handler.sendEmptyMessage(CLOSE_LIGHT);				vibrator.vibrate(pattern, -1);			} else {				bgmageView.setBackgroundResource(R.drawable.bg_flashlight_on);				btnimageView.setImageResource(R.drawable.btn_flash_light_on);				handler.sendEmptyMessage(OPEN_LIGHT);				vibrator.vibrate(pattern, -1);			}			break;		default:			break;		}	}}

 <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" />       <uses-permission android:name="android.permission.VIBRATE" />     <uses-permission android:name="android.permission.WAKE_LOCK" /> 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@drawable/bg_flashlight" >    <RelativeLayout        android:id="@+id/bg_image"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:background="@drawable/bg_flashlight_off" >        <ImageView            android:id="@+id/btn_image"            android:layout_width="wrap_content"            android:layout_height="wrap_content"           android:layout_centerHorizontal="true"             android:layout_alignParentBottom="true"             android:layout_marginBottom="100dip"            android:src="@drawable/btn_flash_light_on" />    </RelativeLayout></RelativeLayout>

1楼l515518205昨天 22:42

简单使用很不错