Android中利用Handler实现图片轮播 ，示例+ 代码

提前定义好一个Runnable接口，然后用handler调用。

Mainactivity代码如下：：

package com.example.handle_01;import android.os.Handler;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.ImageView;import android.widget.TextView;public class MainActivity extends AppCompatActivity {    private TextView textView;    private Handler handler = new Handler();    private ImageView imageView;    private int[]images = {            R.mipmap.image1,R.mipmap.image2    };    private int index;    private MyRunnable myRunnable = new MyRunnable();    class MyRunnable implements Runnable{        @Override        public void run() {            index++;            index = index%2;            imageView.setImageResource(images[index]);            handler.postDelayed(myRunnable,1000);        }    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        textView = (TextView) findViewById(R.id.textView);        imageView = (ImageView) findViewById(R.id.imageView);        handler.post(myRunnable);        /*        new Thread(){            public void run(){                try {                    Thread.sleep(1000);                    //post方法xiugai UI                    handler.post(new Runnable() {                        @Override                        public void run() {                            //在UI线程中执行                            textView.setText("update thread");                        }                    });                   // textView.setText("update thread");                } catch (InterruptedException e) {                    e.printStackTrace();                }            }        }.start();        */    }}

activity_main代码如下：：：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.handle_01.MainActivity">    <TextView        android:id="@+id/textView"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Hello World!" />    <ImageView        android:src="@mipmap/ic_launcher"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/imageView"        android:layout_centerInParent="true" /></RelativeLayout>