ProgressDialog和AsyncTask的一个例子，一次删除多个联系人

选择了要删除的联系人，uriData; 调用DeleteMultipleContactResult(uriData);

private int num;

private void  DeleteMultipleContactResult(ArrayList<Uri> uriData){
    	num = uriData.size();//获取要删除联系人的个数
    	
    	final DialogInterface.OnClickListener deleteMultipleClickListener =
            new DialogInterface.OnClickListener() {
                 public void onClick(DialogInterface dialog,int which){
                	 connect(uriData);
                     }
        	};
        	
        //show dialog.if ok,then delete multiple contacts 
        new AlertDialog.Builder(this)
            .setTitle(R.string.deleteConfirmation_title)
            .setIcon(android.R.drawable.ic_dialog_alert)
            .setMessage(R.string.multipleContactDeleteConfirmation)
            .setNegativeButton(android.R.string.cancel, null)
            .setPositiveButton(android.R.string.ok, deleteMultipleClickListener)
            .show();
        
    }
    
    private void connect(ArrayList<Uri> uriData){
    	DeleteMultipleTask Task = new DeleteMultipleTask(this);
   	 	Task.execute(uriData);
    }
    
    class DeleteMultipleTask extends AsyncTask<ArrayList<Uri>,Integer,String>{
    	boolean mCanceled = false;
    	ProgressDialog dialog;
    	public DeleteMultipleTask(Context context){
    		dialog = new ProgressDialog(context);//删除过程中显示进度条
    		dialog.setButton(getString(android.R.string.cancel), new DialogInterface.OnClickListener(){
    			public void onClick(DialogInterface dialog,int i){
    				dialog.dismiss();
    				mCanceled = true;
    			}
    		});
    		dialog.setCancelable(false);
    		dialog.setMax(num);
    		dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
    		dialog.setTitle(R.string.dialog_delete_multiple);
    		dialog.show();
    	}
    	
		@Override
		protected String doInBackground(ArrayList<Uri>... uriDatas) {
			// TODO Auto-generated method stub
			ArrayList<Uri> uriData = uriDatas[0];
			ContentResolver resolver = getContentResolver();
             for(int i = 0; i < num; i++){
            	 if(!mCanceled){
            		 mSelectedContactUri = uriData.get(i);
            		 resolver.delete(RawContacts.CONTENT_URI,
            				 RawContacts.CONTACT_ID + "=" + ContentUris.parseId(mSelectedContactUri),null);
            		 dialog.incrementProgressBy(1);
            	 }else{
            		 break;
            	 }
             }
             return null;
		}
		
		protected void onPostExecute(String result){
			dialog.dismiss();
		}
    }