Android开发案例 设置背景图片轮播
点击按钮实现图片轮播效果
实践案例:
xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Main2Activity"
android:orientation="vertical"
android:gravity="center">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="350dp">
<android.support.v7.widget.AppCompatImageView
android:id="@+id/img1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@mipmap/img1" />
<android.support.v7.widget.AppCompatImageView
android:id="@+id/img2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@mipmap/img2" />
<android.support.v7.widget.AppCompatImageView
android:id="@+id/img3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@mipmap/img3" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="切换图片" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="返回主页" />
</LinearLayout>
</LinearLayout>
Java
package com.example.administrator.demo2;
import android.content.Intent;
import android.media.Image;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
public class Main2Activity extends AppCompatActivity {
//定义所有的轮播图片
int[] image = new int[]{
R.mipmap.img1,
R.mipmap.img2,
R.mipmap.img3
};
//定义初始下标为0
int Index = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
//获取ImageView
final ImageView img = (ImageView) findViewById(R.id.img1);
img.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (Index>=2){
Index=-1;
}
//改变ImageView中的Src属性值
img.setImageResource(image[++Index]);
}
});
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (Index>=2)
Index=-1;
//改变ImageView中的Src属性值
img.setImageResource(image[++Index]);
}
});
Button ubt1 = (Button) findViewById(R.id.button2);
ubt1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent it = new Intent();
it.setClass(Main2Activity.this,MainActivity.class);
startActivity(it);
}
});
}
}
本文来自博客园,作者:明金同学,转载请注明原文链接:https://www.cnblogs.com/vmuu/p/15663527.html
公众号:【明金同学】