安卓开发之安卓手电筒

Java代码（MainActivity）：

package com.example.light;import com.example.light.R;//import android.support.v7.app.ActionBarActivity;import android.app.Activity;import android.content.pm.PackageManager;import android.graphics.Point;import android.graphics.SurfaceTexture;import android.hardware.Camera;import android.hardware.Camera.Parameters;import android.os.Bundle;import android.view.View;import android.view.ViewGroup.LayoutParams;import android.widget.ImageView;import android.widget.Toast;public class MainActivity extends Activity {private ImageView mImageViewFlashlight;private ImageView mImageViewFlashlightController;private Camera mCamera;private Parameters mParameters;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //去掉标题栏        //requestWindowFeature(Window.FEATURE_NO_TITLE);        //窗体全屏显示        //getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);        setContentView(R.layout.activity_main);        mImageViewFlashlight = (ImageView) findViewById(R.id.imageview_flashlight);        mImageViewFlashlightController = (ImageView) findViewById(R.id.imageview_flashlight_controller);        mImageViewFlashlight.setTag(false);        Point point = new Point();        getWindowManager().getDefaultDisplay().getSize(point);LayoutParams laParams = (LayoutParams) mImageViewFlashlightController.getLayoutParams();laParams.height = point.y * 3 / 4;laParams.width = point.x / 3;mImageViewFlashlightController.setLayoutParams(laParams);    }    public void onClick_Flashlight(View view) {if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)) {Toast.makeText(this, "当前设备没有闪光灯", Toast.LENGTH_LONG).show();return;}if (((Boolean) mImageViewFlashlight.getTag()) == false) {openFlashlight();   } else {closeFlashlight();}}// 打开闪光灯protected void openFlashlight() {/*TransitionDrawable drawable = (TransitionDrawable) mImageViewFlashlight.getDrawable();drawable.startTransition(200);*/mImageViewFlashlight.setTag(true);mImageViewFlashlight.setImageResource(R.drawable.shou_on);try {mCamera = Camera.open();int textureId = 0;mCamera.setPreviewTexture(new SurfaceTexture(textureId));mCamera.startPreview();mParameters = mCamera.getParameters();mParameters.setFlashMode(mParameters.FLASH_MODE_TORCH);mCamera.setParameters(mParameters);} catch (Exception e) {// TODO: handle exception}}// 关闭闪光灯protected void closeFlashlight() {/*TransitionDrawable drawable = (TransitionDrawable) mImageViewFlashlight.getDrawable();*/if (((Boolean) mImageViewFlashlight.getTag())) {//drawable.reverseTransition(200);mImageViewFlashlight.setTag(false);mImageViewFlashlight.setImageResource(R.drawable.shou_off);if (mCamera != null) {mParameters = mCamera.getParameters();mParameters.setFlashMode(Parameters.FLASH_MODE_OFF);mCamera.setParameters(mParameters);mCamera.stopPreview();mCamera.release();mCamera = null;}}}@Overrideprotected void onDestroy() {super.onDestroy();closeFlashlight();}    }

Java代码（SplashActivity）：

package com.example.light;import com.example.light.R;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.os.Handler;import android.os.Looper;import android.os.Message;import android.view.Window;import android.view.WindowManager;public class SplashActivity extends Activity{@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//去掉标题栏        requestWindowFeature(Window.FEATURE_NO_TITLE);        //窗体全屏显示        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);        setContentView(R.layout.light_main);new Thread(){@Overridepublic void run() {// TODO Auto-generated method stubsuper.run();try {sleep(3000);handlerDelay.sendEmptyMessage(0);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}.start();}private Handler handlerDelay=new Handler(){@Overridepublic void handleMessage(Message msg) {// TODO Auto-generated method stubsuper.handleMessage(msg);new Thread(new Runnable() {@Overridepublic void run() {Looper.prepare();finish();Intent intent=new Intent(SplashActivity.this,MainActivity.class);startActivity(intent);}}).start();}};}

Xml代码（activity_main）：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/framelayout_flashlight"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#333333"     >    <ImageView        android:id="@+id/imageview_flashlight"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:src="@drawable/shou_off" />    <ImageView        android:id="@+id/imageview_flashlight_controller"        android:layout_width="100dp"        android:layout_height="320dp"        android:layout_gravity="bottom|center_horizontal"        android:onClick="onClick_Flashlight"  /></FrameLayout>

Xml代码（light_main）：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/framelayout_flashlight"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@drawable/mm3"     ></FrameLayout>

Xml代码（AndroidManifest）：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.light"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="19" />    <uses-permission android:name="android.permission.CAMERA" />    <uses-permission android:name="android.permission.FLASHLIGHT" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.example.light.SplashActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity android:name="com.example.light.MainActivity" />    </application></manifest>

源码地址：http://download.csdn.net/detail/anonymouslai/9440419