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 msprivate 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};@Overrideprotected 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() {@Overridepublic 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"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"><TextViewandroid:id="@+id/tv_img0"android:layout_width="130dp"android:layout_height="70dp"android:textSize="30sp"/><TextViewandroid:id="@+id/tv_img1"android:layout_width="130dp"android:layout_height="70dp"android:textSize="30sp"android:gravity="center"/><TextViewandroid:id="@+id/tv_img2"android:layout_width="100dp"android:layout_height="70dp"android:gravity="center"android:textSize="30sp"/><TextViewandroid:id="@+id/tv_img3"android:gravity="center"android:layout_width="130dp"android:layout_height="70dp"android:textSize="30sp"/><TextViewandroid:id="@+id/tv_img4"android:layout_width="130dp"android:gravity="center"android:layout_height="70dp"android:textSize="30sp"/></LinearLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"><ImageViewandroid:id="@+id/iv_img0"android:layout_width="130dp"android:layout_height="70dp"android:scaleType="fitStart"/><ImageViewandroid:id="@+id/iv_img1"android:layout_width="130dp"android:layout_height="70dp"android:scaleType="fitStart"/><ImageViewandroid:id="@+id/iv_img2"android:layout_width="130dp"android:layout_height="70dp"android:scaleType="fitStart"/><ImageViewandroid:id="@+id/iv_img3"android:layout_width="130dp"android:layout_height="70dp"android:scaleType="fitStart"/><ImageViewandroid:id="@+id/iv_img4"android:layout_width="130dp"android:layout_height="70dp"android:scaleType="fitStart"/></LinearLayout></LinearLayout>
end
