2.6日自学成果

今天学习开发了制作一个相册功能的小软件

package com.example.app02;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

import java.security.cert.Extension;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private ImageView mImage;
    private TextView mText;
    private int index;
    private int num;
    private int index1;
    private String[] title;
    private int[] images;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化控件
        initView();
        //初始化数据
        initData();
    }

    private void initData() {
        title = new String[]{"第一张图片","第二张图片","第三张图片","第四张图片","第五张图片"};
        images = new int[]{R.drawable.a,R.drawable.b,R.drawable.c,R.drawable.d,R.drawable.e};
        mImage.setImageResource(images[0]);
        mText.setText(title[0]);
        num = title.length;
        index1 = 0;//当前显示图片的索引
    }

<?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">

    <ImageView
        android:id="@+id/iv_show"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_weight="1"
        android:background="@android:color/background_dark"
        ></ImageView>

    <TextView
        android:id="@+id/tv_show"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="10dp"
        android:text="图片信息" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center" >
    <Button
        android:id="@+id/btn_previous"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="上一张"
        />
    <Button
        android:id="@+id/btn_next"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="下一张"
        />
    </LinearLayout>
</LinearLayout>