安卓第一次作业

1、设计目标

        模拟微信切换界面，底部有四个功能图标，点击每个功能图标会变色并且进行页面切换。

2、功能说明

        在layout的bottom.xml中涉及wechat的底部ui，在底部设置4个按钮，对应四个微信，朋友，通讯录和设置

        在layout的activity_main.xml中，设计中间一层的ui，将一个空Fragement拉进来，并且把top.xml和bottom.xml引入。通过建立4个Fragment，将4个Fragment文件放入java文件中，然后通过fragment的代码与4个.xml文件相连接

3、代码解析

        在Linearlayout中添加textview和imagebutton

调整Linearlayout

<LinearLayout


        android:id="@+id/id_tab_weixin"
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:layout_weight="1"
        android:background="@drawable/bottom_bar"
        android:orientation="vertical">


        <ImageButton
            android:id="@+id/id_tab_weixin_img"
            android:layout_width="match_parent"
            android:layout_height="80dp"
            android:layout_weight="1"
            android:clickable="false"

            android:background="#000000"
            app:srcCompat="@drawable/weixin2"
            tools:ignore="SpeakableTextPresentCheck" />

        <TextView
            android:id="@+id/textView1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center_horizontal"
            android:saveEnabled="false"
            android:text="微信"
            android:textColor="#ffffff"
            android:textSize="15sp" />

    </LinearLayout>

然后在layout中新建一个activity_main.xml文件 将FrameLayout拖入，进入Code编辑代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <include
        layout="@layout/top"
        android:layout_height="143dp" />

    <FrameLayout
        android:id="@+id/id_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1">

    </FrameLayout>

    <include layout="@layout/bottom" />

</LinearLayout>

MainActivity代码

package com.example.mywork_lbw;

import androidx.appcompat.app.AppCompatActivity;

import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.ImageButton;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private LinearLayout mTabWeixin;
    private LinearLayout mTabfrd;
    private LinearLayout mTabAddress;
    private LinearLayout mTabSetting;

    private ImageButton mWeixinImg;
    private ImageButton mFrdImg;
    private ImageButton mAddressImg;
    private ImageButton mSettingImg;


    private Fragment mTab01 = new weixinFragment();
    private Fragment mTab02 = new frdFragment();
    private Fragment mTab03 = new contactFragment();
    private Fragment mTab04 = new settingsFragment();

    private FragmentManager fm;

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

        initView();
        initEvent();
        initFragment();
        selectfragment(0);
    }

    private void initFragment() {
        //fragment的切换
        fm = getFragmentManager();
        FragmentTransaction transaction = fm.beginTransaction();
        transaction.add(R.id.id_content, mTab01);
        transaction.add(R.id.id_content, mTab02);
        transaction.add(R.id.id_content, mTab03);
        transaction.add(R.id.id_content, mTab04);
        transaction.commit();
    }

    private void initEvent() {
        mTabWeixin.setOnClickListener(this);
        mTabfrd.setOnClickListener(this);
        mTabAddress.setOnClickListener(this);
        mTabSetting.setOnClickListener(this);
    }

    private void initView() {
        mTabWeixin = (LinearLayout) findViewById(R.id.id_tab_weixin);
        mTabfrd = (LinearLayout) findViewById(R.id.id_tab_frd);
        mTabAddress = (LinearLayout) findViewById(R.id.id_tab_contact);
        mTabSetting = (LinearLayout) findViewById(R.id.id_tab_settings);

        mWeixinImg = (ImageButton) findViewById(R.id.id_tab_weixin_img);
        mFrdImg = (ImageButton) findViewById(R.id.id_tab_frd_img);
        mAddressImg = (ImageButton) findViewById(R.id.id_tab_contact_img);
        mSettingImg = (ImageButton) findViewById(R.id.id_tab_settings_img);


    }

    private void selectfragment(int i) {
        FragmentTransaction transaction = fm.beginTransaction();
        hideFragment(transaction);
        switch (i) {
            case 0:
                Log.d("setSelect", "1");
                transaction.show(mTab01);
                mWeixinImg.setImageResource(R.drawable.weixin1);
                break;
            case 1:
                transaction.show(mTab02);
                mFrdImg.setImageResource(R.drawable.friend1);
                break;
            case 2:
                transaction.show(mTab03);
                mAddressImg.setImageResource(R.drawable.address1);
                break;
            case 3:
                transaction.show(mTab04);
                mSettingImg.setImageResource(R.drawable.setting1);
                break;
            default:
                break;
        }
        transaction.commit();
    }

    private void hideFragment(FragmentTransaction transaction) {
        transaction.hide(mTab01);
        transaction.hide(mTab02);
        transaction.hide(mTab03);
        transaction.hide(mTab04);
    }

    @Override
    public void onClick(View view) {
        resetimg();
        switch (view.getId()) {
            case R.id.id_tab_weixin:
                selectfragment(0);
                break;
            case R.id.id_tab_frd:
                selectfragment(1);
                break;
            case R.id.id_tab_contact:
                selectfragment(2);
                break;
            case R.id.id_tab_settings:
                selectfragment(3);
                break;
        }
    }

    public void resetimg() {
        mWeixinImg.setImageResource(R.drawable.weixin2);
        mFrdImg.setImageResource(R.drawable.friend2);
        mAddressImg.setImageResource(R.drawable.address2);
        mSettingImg.setImageResource(R.drawable.setting2);
    }
}

4、运行展示截图

5、源码仓库地址

https://gitee.com/waiaiy/android.git

最后

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