自动重试的Runnable, 用于等待UI完成一定程度后触发

gistfile1.java

package com.buy.apps.view;

import android.os.Handler;
import android.view.View;

/**
 * 自动重试的Runnable, 用于等待UI完成一定程度后触发
 * @author holmes
 *
 */
public abstract class AutoTryRunable implements Runnable{
    
    private PostDelegate mDelegate;
    private boolean mFinished = false;
    
    public AutoTryRunable(View v){
        mDelegate = new PostDelegate(v);
    }
    
    public AutoTryRunable(Handler handler){
        mDelegate = new PostDelegate(handler);
    }

    @Override
    public final void run() {
        // It is Auto-generated method stub
        if (!canRun()){
            mDelegate.post(this);
        }else{
            doRun();
        }
    }
    
    /**
     * 是否已结束
     * @return
     */
    public boolean isFinished(){
        return mFinished;
    }
    
    /**
     * 停止
     */
    public void removeCallback(){
        mDelegate.remove(this);
    }

    /**
     * 是否可以执行
     * @return
     */
    public abstract boolean canRun();
    
    /**
     * 要执行的任务
     * @return
     */
    public abstract void doRun();
    
    /**
     * Post代理
     * @author holmes
     *
     */
    private static class PostDelegate{
        
        private final Object mHost;
        
        public PostDelegate(View v) {
            // TODO Auto-generated constructor stub
            mHost = v;
        }
        
        public PostDelegate(Handler handler){
            mHost = handler;
        }
        
        public void post(final Runnable run){
            if (mHost instanceof View){
                ((View) mHost).post(run);
            }else if (mHost instanceof Handler){
                ((Handler) mHost).post(run);
            }
        }
        
        public void remove(Runnable run){
            if (mHost instanceof View){
                ((View) mHost).removeCallbacks(run);
            }else if (mHost instanceof Handler){
                ((Handler) mHost).removeCallbacks(run);
            }
        }
    }
}