第一天 基本的界面美化

TextView

<?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"

    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:layout_margin="20dp">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tv_1"
        android:text="陈琪真的帅"
        android:textColor="#00FF80"
        android:textSize="25sp"
        android:layout_margin="20dp"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tv_2"
        android:text="陈琪真的帅深度思考的建设军事基地"
        android:textColor="#FF0040"
        android:textSize="25sp"
        android:singleLine="true"
        android:padding="20dp"
        android:ellipsize="marquee"
        android:marqueeRepeatLimit="marquee_forever"
        android:focusable="true"
        android:focusableInTouchMode="true"
        />

</LinearLayout>

Button 

<?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"
    android:gravity="center"
    >




        <Button
            android:id="@+id/bnt_textview"
            android:layout_width="200dp"
            android:layout_height="50dp"
            android:layout_below="@+id/btn_buttn"
            android:background="#00BFFF"
            android:text="查看"
            android:textColor="#FF0000"
            android:textSize="25sp"

            />

        <Button
            android:id="@+id/btn_buttn"
            android:layout_width="200dp"
            android:layout_height="50dp"
            android:layout_marginTop="10dp"
            android:background="@drawable/btn"
            android:textSize="25sp"

            android:text="浏览" />

        <Button
            android:id="@+id/btn_buttn2"
            android:layout_width="200dp"
            android:layout_height="50dp"
            android:layout_marginTop="10dp"
            android:background="@drawable/bg_btn"
            android:text="确认"
            android:onClick="showTost"
            android:textSize="25sp" />
        <Button
            android:id="@+id/btn_buttn3"
            android:layout_width="200dp"
            android:layout_height="50dp"
            android:layout_marginTop="10dp"
            android:background="@drawable/bg_btn"
            android:text="编辑"
            android:onClick="showTost"
            android:textSize="25sp" />


</LinearLayout>

按钮摁压颜色变化

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_pressed="true">
    <shape>
        <solid android:color="#04B4AE"/>
        <corners android:radius="60dp"/>
    </shape>

    </item>
    <item android:state_pressed="false">
        <shape>
            <solid android:color="#81F7F3"/>
            <corners android:radius="60dp"/>
        </shape>

    </item>

</selector>

监听事件

package com.example.homework;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private Button mBtnTextView;
    private Button mBtnButton;
    private  Button mBtnEdit;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mBtnTextView =findViewById(R.id.bnt_textview);
        mBtnTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //跳转到TextView
                Intent intent=new Intent(MainActivity.this,TextViewActivity.class);
                startActivity(intent);
            }
        });
        mBtnButton=findViewById(R.id.btn_buttn);
        mBtnButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,ButtonView.class);
                startActivity(intent);
            }
        });
        mBtnEdit=findViewById(R.id.btn_buttn3);
        mBtnEdit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,EditActivity.class);
                startActivity(intent);
            }
        });
    }
    public void showTost(View view){
        Toast.makeText(this,"成功",Toast.LENGTH_SHORT).show();
    }
}