Android 关于简单图片浏览器的实现

界面设计：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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/tvShow"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
       android:text="@string/Hello_word"
         android:textSize="20sp"/>
    <ImageView
        android:id="@+id/ivShow"
        android:layout_gravity="center_horizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:scaleType="center"
        android:src="@mipmap/image1"/>

    <LinearLayout
        android:id="@+id/linerl"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="25dp"
        android:orientation="horizontal">

        <ImageButton
            android:id="@+id/btnLeft"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:layout_marginLeft="25dp"
            android:src="@mipmap/btn_pre_gray" />

        <ImageButton
            android:id="@+id/btnRight"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="90dp"
            android:src="@mipmap/btn_next_gray" />


    </LinearLayout>
</LinearLayout>

JAVA代码页面

package com.example.dell.imagetest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
TextView  tvShow;
ImageButton btnLeft,btnRight;
ImageView ivShow;
int currentimageid=0; //记录当前图片显示的ID
 int  imageid[]={R.mipmap.image1,R.mipmap.image2,R.mipmap.image3,R.mipmap.image4};//创建一个数组  里面放的是图片ID
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tvShow=(TextView)findViewById(R.id.tvShow);
        btnLeft=(ImageButton) findViewById(R.id.btnLeft);
        btnRight=(ImageButton) findViewById(R.id.btnRight);
        ivShow=(ImageView)findViewById(R.id.ivShow);
        btnRight.setOnClickListener(new Action());
        btnLeft.setOnClickListener(new Action());
    }
    class Action implements View.OnClickListener{
        @Override
        public void onClick(View v) {
            if (v==btnLeft){ //如果单击的是上一张按钮   
                currentimageid=(currentimageid-1+imageid.length)%imageid.length;//计算图片在数组的中id

                ivShow.setImageResource(imageid[currentimageid]);//设置显示的图片

            }
            if (v==btnRight){
                currentimageid=(currentimageid+1+imageid.length)%imageid.length;
                ivShow.setImageResource(imageid[currentimageid]);
            }
        }
    }
}