handler应用（1）

handler应用（1）

使用handler循环图片

package com.example.file;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.ImageView;

public class MainActivity extends Activity {

    private Handler handler = new Handler();

    private ImageView imageView;
    private int images[] = {R.drawable.image1,R.drawable.image2,R.drawable.image3};

    private int index;

    private MyRunnable myRunnable= new MyRunnable();

    class MyRunnable implements Runnable{

        @Override
        public void run() {
            index ++;
            index = index%3;
            imageView.setImageResource(images[index]);
            handler.postDelayed(myRunnable,1000);
        }

    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView = (ImageView) findViewById(R.id.imageView);
        handler.postDelayed(myRunnable, 1000);
    }
}