Android Studio中Button相关知识

一、文字大小、颜色，背景形状

1.

activity_button.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="15dp">
    <Button
        android:id="@+id/btn_1"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:text="按钮1"
        android:textSize="20sp"
        android:textColor="#000000"
        android:background="#FF0077"/>
    <Button
        android:id="@+id/btn_2"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:text="按钮2"
        android:textSize="20sp"
        android:textColor="#000000"
        android:background="#FF0077"
        android:layout_below="@id/btn_1"
        android:layout_marginTop="10dp"/>
</RelativeLayout>

MainActivity.java:

package com.example.androidone;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

    private Button mBtnTextView;
    private Button mBtnButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        mBtnButton = (Button) findViewById(R.id.btn_button);
        mBtnButton.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                //跳转到Button演示界面
                Intent intent = new Intent(MainActivity.this, ButtonActivity.class);
                startActivity(intent);
                }
            });
    }
}

2.将按钮设置为圆角

在resdrawable文件夹下新建

 bg_btn2.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid
        android:color="#FF9900"/>
    <corners
        android:radius="10dp"/>
</shape>

activity_button.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="15dp">
    <Button
        android:id="@+id/btn_1"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:text="按钮1"
        android:textSize="20sp"
        android:textColor="#000000"
        android:background="#FF0077"/>
    <Button
        android:id="@+id/btn_2"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:text="按钮2"
        android:textSize="20sp"
        android:textColor="#000000"
        android:background="@drawable/bg_btn2"
        android:layout_below="@id/btn_1"
        android:layout_marginTop="10dp"/>
</RelativeLayout>