回调机制

参考文章

http://blog.youkuaiyun.com/xiaanming/article/details/8703708

一、android的Handler 回调

1、在Activity中实例化

new ImageUpLoader("postImg/picture?uid=" + uid, picPath,handler2).start();

public Handler handler2 = new Handler() {
		@Override
		public void handleMessage(android.os.Message msg) {
			super.handleMessage(msg);
			switch (msg.what) {
			case 1:
				String result = msg.obj.toString();
				
				break;
			}
			super.handleMessage(msg);
		}
	};

2、需要回调的类

public class ImageUpLoader extends Thread {

	private Handler handler2;
	
	public ImageUpLoader(String string, String path,Handler handler) {
		urlString = string;
		handler2 = handler;
		file = new File(path);
	}
	
	public void run() {
		// TODO Auto-generated method stub
		super.run();
		new Runnable() {
			public void run() {
			
					Message msg = new Message();
					msg.what = 1;
					msg.obj = sb1.toString();
					handler2.sendMessage(msg);

二、普通回调

1、类

onZidingyiListener.onZDYClick(ZoomImageView.this);  //放在需要回调处

private OnZidingyiListener onZidingyiListener;

public void setOnZidingyiListener(OnZidingyiListener onZidingyiListener) {

		this.onZidingyiListener = onZidingyiListener;

	}

2、Activity

zoomImageView.setOnZidingyiListener(new OnZidingyiListener() {
			@Override
			public void onZDYClick(ZoomImageView zidingyi) {
				ImageDetailsActivity.this.finish();
			}
		});
		
public interface OnZidingyiListener {
		public void onZDYClick(ZoomImageView zidingyi);
	}

三、onActivityResult回调函数

startActivityForResult(Intent intent, int requestCode); 父

onActivityResult(int requestCode, int resultCode, Intent data); 父

setResult(int resultCode, Intent data); 子