1线程实现客户端与服务器通信

线程实现客户端与服务器通信一、线程说明2一：在android中有两种实现线程thread的方法：一种是，扩展java.lang.Thread类另一种是，实现Runnable接口二：Thread类代表线程类，它的两个最主要的方法是：run()——包含线程运行时所执行的代码Start()——用于启动线程三：Handler机制，它是Runnable和Activity交互的桥梁，在run方法中发送Message，在Handler里，通过不同的Message执行不同的任务。二、代码案例3主页面mian_activity.xml<?xmlversion="1.0"encoding="utf-8"?>

<LinearLayoutxmlns:android="/apk/res/android"

xmlns:tools="/tools"

android:id="@+id/activity_main"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

android:gravity="center"

tools:context=".MainActivity">

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="下载图片"

android:id="@+id/btn"/>

</LinearLayout>

二、代码案例4privatestaticButtonbtn;

privatestaticContextcontext;

privatestaticStringfilePath;

privatestaticBitmapmBitmap;

privatestaticStringmSaveMessage="失败";

privatefinalstaticStringTAG="PictureActivity";

privatestaticProgressDialogmSaveDialog=null;

@Override

protectedvoidonCreate(BundlesavedInstanceState){

super.onCreate(savedInstanceState);

setContentView(R.layout.main_activity);

btn=(Button)findViewById(R.id.btn);

btn.setOnClickListener(newView.OnClickListener(){

@Override

publicvoidonClick(Viewview){

donwloadImg(MainActivity.this,"21:8080/photo/test.jpg");

}

});

}主页面MainActivity.java二、代码案例5

publicstaticvoiddonwloadImg(Contextcontexts,StringfilePaths){

context=contexts;

filePath=filePaths;

mSaveDialog=ProgressDialog.show(context,"保存图片","图片正在保存中，请稍等...",true);

newThread(saveFileRunnable).start();

}

privatestaticRunnablesaveFileRunnable=newRunnable(){

@Override

publicvoidrun(){

try{

if(!TextUtils.isEmpty(filePath)){//网络图片

//对资源链接

URLurl=newURL(filePath);

//打开输入流

InputStreaminputStream=url.openStream();

//对网上资源进行下载转换位图图片

mBitmap=BitmapFactory.decodeStream(inputStream);

inputStream.close();

}

saveFile(mBitmap);

mSaveMessage="图片保存成功！";

}catch(IOExceptione){

mSaveMessage="图片保存失败！";

e.printStackTrace();

}catch(Exceptione){

e.printStackTrace();

}

messageHandler.sendMessage(messageHandler.obtainMessage());

}

};二、代码案例6

privatestaticHandlermessageHandler=newHandler(){

@Override

publicvoidhandleMessage(Messagemsg){

mSaveDialog.dismiss();

Log.d(TAG,mSaveMessage);

Toast.makeText(context,mSaveMessage,Toast.LENGTH_SHORT).show();

}

};

/**

*保存图片

*/

publicstaticvoidsaveFile(Bitmapbm)throwsIOException{

FiledirFile=newFile(Environment.getExternalStorageDirectory().getPath());

if(!dirFile.exists()){

dirFile.mkdir();

}

StringfileName=UUID.randomUUID().toString()+".jpg";

FilemyCaptureFile=newFile(Environment.getExternalStorageDirectory().getPath()+"/DCIM/Camera/"+fileName);

BufferedOutputStreambos=newBufferedOutputStream(newFileOutputStream(myCaptureFile));

press(Bitmap.CompressFormat.JPEG,80,bos);

bos.flush();

bos.close();

//把图片保存后声明这个广播事件通知系统相册有新图片到来

Intentintent=newIntent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);

Uriuri=Uri.fromFile(myCaptureFile);

intent.setData(uri);

context.sendBroadcast(intent);

}

}二、代码案例7<uses-permissionandroid:name="android.permission.INTERNET"></uses-perm