Android开发——界面设计

• 一、设计内容
• 二、开发过程
• • 界面框架布局
  • • top.layout控件
    • bottom的设计以及功能实现（通过按钮实现界面间的切换）
    • MainAtctivity
  • 结果展示
• 三、附代码仓库地址

设计一个聊天类APP的界面的框架结构。
要求：有四个界面，且界面之间可以相互切换。

新建两个布局文件分别用于控制top和bottom的布局。

在此仅展示一组bottom的设计代码，其他类似

package com.example.weixinandroid;

import androidx.appcompat.app.AppCompatActivity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;

import android.os.Bundle;
import android.view.View;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity  implements View.OnClickListener{

    private  Fragment friendFragment = new friendFragment();
    private  Fragment findFragment = new findFragment();
    private  Fragment settingFragment = new settingFragment();
    private  Fragment weixinFragment = new weixinFragment();
    private FragmentManager fragmentManager;
    private LinearLayout linearLayout1,linearLayout2,linearLayout3,linearLayout4;

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


        linearLayout1 = findViewById(R.id.Linearlayout_weixin);
        linearLayout2 = findViewById(R.id.Linearlayout_friend);
        linearLayout3 = findViewById(R.id.Linearlayout_find);
        linearLayout4 = findViewById(R.id.Linearlayout_setting);

        linearLayout1.setonClickListener(this);
        linearLayout2.setonClickListener(this);
        linearLayout3.setonClickListener(this);
        linearLayout4.setonClickListener(this);
        initFragment();
        ShowFragment(0);

    }
    private void initFragment(){
        fragmentManager = getFragmentManager();
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        transaction.add(R.id.id_content,weixinFragment);
        transaction.add(R.id.id_content,findFragment);
        transaction.add(R.id.id_content,friendFragment);
        transaction.add(R.id.id_content,settingFragment);
        transaction.commit();
    }
    private void hideFragment(FragmentTransaction transaction){
        transaction.hide(weixinFragment);
        transaction.hide(findFragment);
        transaction.hide(friendFragment);
        transaction.hide(settingFragment);
    }

    @Override
    public void onClick(View v){
        switch(v.getId()){
            case R.id.Linearlayout_weixin:
                ShowFragment(0);
                break;
            case R.id.Linearlayout_friend:
                ShowFragment(1);
                break;
            case R.id.Linearlayout_find:
                ShowFragment(2);
                break;
            case R.id.Linearlayout_setting:
                ShowFragment(3);
                break;
            default:
                break;
        }

    }

    private void ShowFragment(int i) {
        FragmentTransaction transaction=fragmentManager.beginTransaction();
        hideFragment(transaction);
        switch (i){
            case 0:
                transaction.show(weixinFragment);
                break;
            case 1:
                transaction.show(friendFragment);
                break;
            case 2:
                transaction.show(findFragment);
                break;
            case 3:
                transaction.show(settingFragment);
                break;
            default:
                break;
        }
        transaction.commit();
    }
}

Android代码仓库