android通過url下載圖片並實現fragment與activity的圖片互動

標籤：android   activity   url下載圖片   

        650) this.width=650;" src="http://s3.51cto.com/wyfs02/M00/56/BD/wKiom1SL18DS-xfoAAB0b2g3jvk579.jpg" title="all.jpg" alt="wKiom1SL18DS-xfoAAB0b2g3jvk579.jpg" />

    增加了圖片放大縮小功能，一共用到三個類。MainActivity僅作為添加fragment用，其全部代碼如：

package com.example.ex_1213_mypic;

import android.os.Bundle;

import android.support.v4.app.FragmentActivity;

import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentTransaction;

import android.view.Menu;

public class MainActivity extends FragmentActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

addFragment();//添加片段

}

private void addFragment() {

FragmentManager fm = getSupportFragmentManager();

FragmentTransaction ft = fm.beginTransaction();

MyFragment myFragment = new MyFragment();

ft.add(R.id.fl_replace, myFragment);

ft.commit();

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

}

    mainActivity添加完fragment就放寒假了。

    先在fragment的xml裡添加兩張預設圖片：

    650) this.width=650;" src="http://s3.51cto.com/wyfs02/M00/56/BD/wKiom1SL2gfwqftkAABY6LAm_sE175.jpg" title="xml.jpg" alt="wKiom1SL2gfwqftkAABY6LAm_sE175.jpg" />

    得到所需圖片地址，並通過AsyncTask執行下載，將下載完的圖片放進聲明出來的bitmapList中，全部下載完成後再初始化控制項：

    

package com.example.ex_1213_mypic;

import java.io.IOException;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import java.util.ArrayList;

import android.content.Intent;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.AsyncTask;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.ImageView;

public class MyFragment extends Fragment implements OnClickListener{

String [] urlList = {

"http://7qn7nu.com1.z0.glb.clouddn.com/77.jpg",

"http://7qn7nu.com1.z0.glb.clouddn.com/u=3516622004,3632540994&fm=59.jpg"

};

private View layout;

ArrayList<Bitmap> bitmapList = new ArrayList<Bitmap>();

public MyFragment() {

// Required empty public constructor

}

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

if(layout == null){

layout = getActivity().getLayoutInflater().inflate(R.layout.fragment_my, null);

initBitmap();//下載圖片

}else{

ViewGroup parent = (ViewGroup) layout.getParent();

parent.removeView(layout);

}

return layout;

}

private int index;

private void initBitmap() {

MyAsync myAsync = new MyAsync();

if(index < 2){

//下載圖片

myAsync.execute(urlList[index]);

}else{

initView();//初始化控制項

}

}

 

AsyncTask下載過程:

class MyAsync extends AsyncTask<String, Void, Bitmap>{

@Override

protected Bitmap doInBackground(String... params) {

URL url;

Bitmap bitmap = null;   

try {

url = new URL(params[0]);

//URLConnection con=url.openConnection();

HttpURLConnection con=(HttpURLConnection) url.openConnection();

con.setDoInput(true);

con.connect();

           InputStream is=con.getInputStream();

           bitmap=BitmapFactory.decodeStream(is); 

           is.close();

} catch (MalformedURLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return bitmap;

}

@Override

protected void onPostExecute(Bitmap bitmap) {

// TODO Auto-generated method stub

super.onPostExecute(bitmap);

if (bitmap != null) {

if(index < 2){

bitmapList.add(bitmap);

index++;

initBitmap();

}

}

}

}

    將下載完成的bitmap顯示到控制項中：

    

private void initView() {

ImageView img1 = (ImageView) layout.findViewById(R.id.imageView1);

ImageView img2 = (ImageView) layout.findViewById(R.id.imageView2);

img1.setImageBitmap(bitmapList.get(0));

img2.setImageBitmap(bitmapList.get(1));

img1.setOnClickListener(this);

img2.setOnClickListener(this);

}

    650) this.width=650;" src="http://s3.51cto.com/wyfs02/M02/56/BB/wKioL1SL3gfjkooIAAKDgPFhYkw007.jpg" title="下載後.jpg" alt="wKioL1SL3gfjkooIAAKDgPFhYkw007.jpg" />

    這樣就可以將網路上的圖片正常顯示到APP裡了，記得添加許可權：

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

    最後fragment的圖片傳到MyTouchActivity裡。首先在MyTouchActivity寫一個方法用來接收圖片：

public void getBitmapInfo(Bitmap bitmap, int position){

this.bitmap = bitmap;

this.position = position;

}

    執行圖片的點擊事件時，先new 出MyTouchActivity對象並調用上面所寫方法傳入圖片：

    //傳出對應的圖片到MytouchActivity，同時從當前activity跳轉到MytouchActivity

private void initClickBitmap(int x) {

Intent intent = new Intent();

MyTouchActivity touchActivity = new MyTouchActivity();

if(bitmapList.size() > x){

touchActivity.getBitmapInfo(bitmapList.get(x), x);

intent.setClass(getActivity(), MyTouchActivity.class);

startActivity(intent);

}

}

@Override

public void onClick(View v) {

switch (v.getId()) {

case R.id.imageView1:

initClickBitmap(0);

break;

case R.id.imageView2:

initClickBitmap(1);

break;

default:

break;

}

}

    在MyTouch裡將接收到的bitmap顯示出來就可以了。

    650) this.width=650;" src="http://s3.51cto.com/wyfs02/M02/56/BD/wKiom1SL37Kwa4rcAANtQ80A83Q791.jpg" title="點擊之後.jpg" alt="wKiom1SL37Kwa4rcAANtQ80A83Q791.jpg" />

    650) this.width=650;" src="http://s3.51cto.com/wyfs02/M00/56/BB/wKioL1SL4SLyXctZAAOiNfgpIiU895.jpg" title="手機.jpg" alt="wKioL1SL4SLyXctZAAOiNfgpIiU895.jpg" />

    簡單寫一個例子，供有需要的朋友參考，新手上路，不足之處請大俠們海涵並多指教哈~

    

    

本文出自 “破公子的偽技術部落格” 部落格，請務必保留此出處http://pogongzi.blog.51cto.com/8982426/1589568

android通過url下載圖片並實現fragment與activity的圖片互動