android定时器循环实现轮播图

说明：
android定时器加for循环实现轮播图
效果：

step1:

package com.example.iosdialogdemo;



import android.os.Bundle;
import android.os.Handler;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.util.Arrays;

public class MainActivity extends AppCompatActivity {
    private final int Time = 1000;    //时间间隔，   单位 ms
    private Handler handler = new Handler();
    private int num = 0;      //用来观测重复执行
    private int img[] = {1, 2, 3, 4, 5, 6, 7};
    private String imgString[] = {"12345", "23456", "34567", "45671", "56712", "67123", "71234"};
    private String nameString[] = {"刘备", "关羽", "张飞", "诸葛亮", "袁绍", "曹操", "孙权"};
    private int mips[] = {R.mipmap.liubei, R.mipmap.guanyu, R.mipmap.zhangfei, R.mipmap.zhuge, R.mipmap.yuan, R.mipmap.caocao, R.mipmap.sun};


    private TextView tv_img0, tv_img1, tv_img2, tv_img3, tv_img4;
    private int[] tvIds = {R.id.tv_img0, R.id.tv_img1, R.id.tv_img2, R.id.tv_img3, R.id.tv_img4};
    private TextView[] tvGroups = {tv_img0, tv_img1, tv_img2, tv_img3, tv_img4};

    private ImageView iv_img0, iv_img1, iv_img2, iv_img3, iv_img4;
    private int[] ivIds = {R.id.iv_img0, R.id.iv_img1, R.id.iv_img2, R.id.iv_img3, R.id.iv_img4};
    private ImageView[] ivGroups = {iv_img0, iv_img1, iv_img2, iv_img3, iv_img4};

    private int[] ages = {0, 1, 2, 3, 4};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        for (int i = 0; i < tvIds.length; i++) {
            tvGroups[i] = findViewById(tvIds[i]);
            ivGroups[i] = findViewById(ivIds[i]);
            tvGroups[i].setText(nameString[i]);
            ivGroups[i].setImageResource(mips[i]);
        }


        System.out.println(Arrays.toString(img));
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                handler.postDelayed(this, Time);
                //每隔一段时间要重复执行的代码
                System.out.println("第次执行");
                num++;
                int age = num % 7;
                int sex = num % 5;
                System.out.println(age);
                System.out.println(nameString[age]);
                tvGroups[sex].setText(String.valueOf(nameString[age]));
                ivGroups[sex].setImageResource(mips[age]);
            }
        }, Time);
    }
}

step2:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <TextView
            android:id="@+id/tv_img0"
            android:layout_width="130dp"
            android:layout_height="70dp"
            android:textSize="30sp"
            />

        <TextView
            android:id="@+id/tv_img1"
            android:layout_width="130dp"
            android:layout_height="70dp"
            android:textSize="30sp"
            android:gravity="center"
            />
        <TextView
            android:id="@+id/tv_img2"
            android:layout_width="100dp"
            android:layout_height="70dp"
            android:gravity="center"
            android:textSize="30sp"
            />
        <TextView
            android:id="@+id/tv_img3"
            android:gravity="center"
            android:layout_width="130dp"
            android:layout_height="70dp"
            android:textSize="30sp"
            />
        <TextView
            android:id="@+id/tv_img4"
            android:layout_width="130dp"
            android:gravity="center"
            android:layout_height="70dp"
            android:textSize="30sp"
            />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >

        <ImageView
            android:id="@+id/iv_img0"
            android:layout_width="130dp"
            android:layout_height="70dp"
            android:scaleType="fitStart"
            />

        <ImageView
            android:id="@+id/iv_img1"
            android:layout_width="130dp"
            android:layout_height="70dp"
            android:scaleType="fitStart"
            />

        <ImageView
            android:id="@+id/iv_img2"
            android:layout_width="130dp"
            android:layout_height="70dp"
            android:scaleType="fitStart"
            />
        <ImageView
            android:id="@+id/iv_img3"
            android:layout_width="130dp"
            android:layout_height="70dp"
            android:scaleType="fitStart"
            />
        <ImageView
            android:id="@+id/iv_img4"
            android:layout_width="130dp"
            android:layout_height="70dp"
            android:scaleType="fitStart"
            />

    </LinearLayout>

</LinearLayout>

end