Android之Button练习

常用功能

Android之Button练习_第1张图片

先声明创建一个Button

activity_main.xml

<?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">    <Button        android:id="@+id/btn_textview"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="TextView"/>    <Button        android:id="@+id/btn_button"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Button"/>LinearLayout>

MainActivity.java

package com.example.helloword;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 {    //声明空间    private Button mBtnTextView;    private Button mBtnButton;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mBtnTextView = findViewById(R.id.btn_textview);//找到空间        mBtnTextView.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                //跳转到TextView演示界面                Intent intent = new Intent(MainActivity.this,TextViewActivity.class);                startActivity(intent);            }        });        mBtnButton = findViewById(R.id.btn_button);        mBtnButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                //跳转到Button演示界面                Intent intent = new Intent(MainActivity.this,ButtonActivity.class);                startActivity(intent);            }        });    }}

再新建演示Button的Activity

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="20dp">    <Button        android:id="@+id/btn_1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="按钮1"        android:textSize="20sp"        android:textColor="#0066FF"        android:background="#CCFFFF"/>    <Button        android:id="@+id/btn_2"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="按钮2"        android:layout_below="@id/btn_1"        android:layout_marginTop="20dp"        android:textSize="20sp"        android:textColor="#0066FF"        android:background="@drawable/bg_btn2"/>    <Button        android:id="@+id/btn_3"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="按钮3"        android:textSize="20sp"        android:textColor="#0066FF"        android:background="@drawable/bg_btn3"        android:layout_below="@id/btn_2"        android:layout_marginTop="20dp"/>    <Button        android:id="@+id/btn_4"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="按钮4"        android:textSize="20sp"        android:textColor="#0066FF"        android:background="@drawable/bg_btn4"        android:layout_below="@id/btn_3"        android:layout_marginTop="20dp"        android:onClick="showToast"/>    <Button        android:id="@+id/btn_5"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="按钮5"        android:textSize="20sp"        android:textColor="#0066FF"        android:background="#CCFFFF"        android:layout_below="@id/btn_4"        android:layout_marginTop="20dp"/>RelativeLayout>

ButtonActivity.java

package com.example.helloword;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.Toast;public class ButtonActivity extends AppCompatActivity {    private Button mBtn5;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_button);        mBtn5 = (Button)findViewById(R.id.btn_5);        mBtn5.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Toast.makeText(ButtonActivity.this,"按钮5被点击了",Toast.LENGTH_SHORT).show();            }        });    }//    写showToast这个方法    public void showToast(View view){        Toast.makeText(this,"按钮4被点击了",Toast.LENGTH_SHORT).show();    }}

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="#FF99"/>    <corners        android:radius="15dp"/>shape>

bg_btn3.xml

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="rectangle">    <stroke        android:width="2dp"        android:color="#FF0000"/>    <corners        android:radius="15dp"/>shape>

bg_btn4.xml

<?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="#FFFFFF"/>            <corners android:radius="15dp"/>        shape>    item>    <item android:state_pressed="false">                <shape>            <solid android:color="#CC7A00"/>            <corners android:radius="15dp"/>        shape>    item>selector>

Android之Button练习_第2张图片
图1
Android之Button练习_第3张图片
图2
Android之Button练习_第4张图片
图3

最终效果：

Button练习 Android Emulator - Nexus

常用功能

先声明创建一个Button

再新建演示Button的Activity

最终效果：

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