1線程實現(xiàn)客戶端與服務(wù)器通信

線程實現(xiàn)客戶端與服務(wù)器通信一、線程說明2一：在android中有兩種實現(xiàn)線程thread的方法：一種是，擴展java.lang.Thread類另一種是，實現(xiàn)Runnable接口二：Thread類代表線程類，它的兩個最主要的方法是：run()——包含線程運行時所執(zhí)行的代碼Start()——用于啟動線程三：Handler機制，它是Runnable和Activity交互的橋梁，在run方法中發(fā)送Message，在Handler里，通過不同的Message執(zhí)行不同的任務(wù)。二、代碼案例3主頁面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="下載圖片"

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

</LinearLayout>

二、代碼案例4privatestaticButtonbtn;

privatestaticContextcontext;

privatestaticStringfilePath;

privatestaticBitmapmBitmap;

privatestaticStringmSaveMessage="失敗";

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");

}

});

}主頁面MainActivity.java二、代碼案例5

publicstaticvoiddonwloadImg(Contextcontexts,StringfilePaths){

context=contexts;

filePath=filePaths;

mSaveDialog=ProgressDialog.show(context,"保存圖片","圖片正在保存中，請稍等...",true);

newThread(saveFileRunnable).start();

}

privatestaticRunnablesaveFileRunnable=newRunnable(){

@Override

publicvoidrun(){

try{

if(!TextUtils.isEmpty(filePath)){//網(wǎng)絡(luò)圖片

//對資源鏈接

URLurl=newURL(filePath);

//打開輸入流

InputStreaminputStream=url.openStream();

//對網(wǎng)上資源進行下載轉(zhuǎn)換位圖圖片

mBitmap=BitmapFactory.decodeStream(inputStream);

inputStream.close();

}

saveFile(mBitmap);

mSaveMessage="圖片保存成功！";

}catch(IOExceptione){

mSaveMessage="圖片保存失敗！";

e.printStackTrace();

}catch(Exceptione){

e.printStackTrace();

}

messageHandler.sendMessage(messageHandler.obtainMessage());

}

};二、代碼案例6

privatestaticHandlermessageHandler=newHandler(){

@Override

publicvoidhandleMessage(Messagemsg){

mSaveDialog.dismiss();

Log.d(TAG,mSaveMessage);

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

}

};

/**

*保存圖片

*/

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();

//把圖片保存后聲明這個廣播事件通知系統(tǒng)相冊有新圖片到來

Intentintent=newIntent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);

Uriuri=Uri.fromFile(myCaptureFile);

intent.setData(uri);

context.sendBroadcast(intent);

}

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