开源的Android开发框架-------PowerFramework使用心得（二）图片异步加载ImageTask

图片异步加载。可以备注图片是否缓存、缓存状态。

1、缓存-SD卡，路径可设置

2、图片压缩

3、可加载本地和网络图片

4、url为本地视频文件可以显示缩略图

5、中文url图片地址FileNotFoundException解决

 EditText input = (EditText) findViewById(R.id.input);
 ImageView img = (ImageView) findViewById(R.id.img);
 RadioButton radio1 = (RadioButton) findViewById(R.id.radio1);
 RadioButton radio2 = (RadioButton) findViewById(R.id.radio2);
 RadioButton radio3 = (RadioButton) findViewById(R.id.radio3);
 String url = input.getText().toString();
 ImageTask task = new ImageTask(img,"/mnt/sdcard/",new ImageTaskListener() {

     @Override
     public void onTaskOver(ImageView img) {
         // TODO Auto-generated method stub
         Log.e("loadImg", "图片下载完成");
     }

     @Override
     public void onDownloading(int max, int progress) {
         Log.e("loadImg", "图片下载进度：" + progress + "/" + max);
     }
 });
 ImageTaskOpion option = task.getImageTaskOpion();
 option.setAutoVisibility(radio1.isChecked());
 option.setOverlap(radio2.isChecked());
 option.setAutoCompress(radio3.isChecked());
 task.setOption(option);
 task.execute(url);

以上是框架里面的代码。

下面看看如何在自己的代码里面进行调用。

 public class ImageTaskActivity extends Activity implements OnClickListener {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_image_task);
     }

     @Override
     public void onClick(View v) {
         switch(v.getId()){
         case R.id.btnExecute:
             loadImg();
             break;
         }

     }

     private void loadImg(){
         EditText input = (EditText) findViewById(R.id.input);
         ImageView img = (ImageView) findViewById(R.id.img);
         RadioButton radio1 = (RadioButton) findViewById(R.id.radio1);
         RadioButton radio2 = (RadioButton) findViewById(R.id.radio2);
         RadioButton radio3 = (RadioButton) findViewById(R.id.radio3);
         String url = input.getText().toString();
         ImageTask task = new ImageTask(img,"/mnt/sdcard/",new ImageTaskListener() {

             @Override
             public void onTaskOver(ImageView img) {
                 // TODO Auto-generated method stub
                 Log.e("loadImg", "图片下载完成");
             }

             @Override
             public void onDownloading(int max, int progress) {
                 Log.e("loadImg", "图片下载进度：" + progress + "/" + max);
             }
         });
         ImageTaskOpion option = task.getImageTaskOpion();
         option.setAutoVisibility(radio1.isChecked());
         option.setOverlap(radio2.isChecked());
         option.setAutoCompress(radio3.isChecked());
         task.setOption(option);
         task.execute(url);

     }

 }

DEMO文件的运行效果：

框架和DEMO文件下载地址  http://www.ideayapai.com/Application/Home/View/default/PowerFamily/index-2.htm

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