Android(安卓)异步加载图片

1.运行后界面图：

2.主要代码

　　2.1 activity_main.xml 布局

 1 <LinearLayout 2         android:layout_width="match_parent" 3         android:layout_height="50dp" 4         android:orientation="horizontal" > 5  6         <EditText 7             android:id="@+id/etUrl" 8             android:layout_width="166dp" 9             android:layout_height="wrap_content"10             android:layout_weight="0.65"11             android:text="http://img3.redocn.com/20100206/20100206_c3f11163684180e389c57LUEUjSMDaax.jpg"12             android:ems="10" />13 14         <Button15             android:id="@+id/btnLoad"16             android:layout_width="wrap_content"17             android:layout_height="wrap_content"18             android:onClick="ShowImg"19             android:text="加载" />20     </LinearLayout>21 22     <ImageView23         android:id="@+id/ivImg"24         android:layout_width="match_parent"25         android:layout_height="match_parent"26         android:src="@drawable/ic_launcher" />

XML布局

　　2.2 MainActivity.java

 1     private Handler handler=new Handler(){   2         public void handleMessage(android.os.Message msg){   3             switch (msg.what) {   4             case 1:   5                 Bitmap bitmap=(Bitmap) msg.obj;   6                 ivImg.setImageBitmap(bitmap);   7                 break;   8             default:   9                 break;  10             }  11         }  12     };  13     //showImg14     public void ShowImg(View view){15         final String path = etUrl.getText().toString();16         if(!TextUtils.isEmpty(path)){17             new Thread(){18                 public void run(){19                     try{20                         URL url = new URL(path);21                         HttpURLConnection httpUrlConn = (HttpURLConnection)url.openConnection();22                         httpUrlConn.setRequestMethod("GET");23                         //超时24                         httpUrlConn.setConnectTimeout(5000);25                         int responseCode = httpUrlConn.getResponseCode();26                         if(responseCode == 200){27                             InputStream is = httpUrlConn.getInputStream();28                             Bitmap bitmap = BitmapFactory.decodeStream(is);29 30                             Message msg = new Message();31                             msg.what=1;32                             msg.obj = bitmap;33                             handler.sendMessage(msg);34                         }35 36                     }catch(MalformedURLException e){37                         e.printStackTrace();38                     }catch(IOException e){39                         e.printStackTrace();40                     }41                 }42             }.start();43         }else{44             Toast.makeText(this, "图片路径不能为空", Toast.LENGTH_LONG).show();45         }46         47     }48

View Code

　　2.3 同样在XML布局中找到Button注册一个onclick事件引用MainActivity中的ShowImg方法

3. AndroidManifest.xml 中注册联网权限

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

4. demo

https://github.com/cnfanhua/A-AsynLoadPic

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