常用功能
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"/>
<!-- 功能:圆角-->
<!-- 1.按下图1,2步骤新建xml-->
<!-- 2.在bg_btn2中完成设置-->
<!-- 3.android:background导入-->
<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"/>
<!-- 功能:描边+圆角-->
<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"/>
<!-- 功能一:按压效果-->
<!-- 1.按下图1,3的步骤新建xml-->
<!-- 2.在bg_btn4中完成设置-->
<!-- 功能二:点击事件方法1-->
<!-- 1.写android:onClick="showToast"-->
<!-- 2.在ButtonActivity.java中写这个方法-->
<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"/>
<!-- 功能:点击事件方法2-->
<!-- 直接在在ButtonActivity.java中对btn_5进行操作-->
</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"/>
<!-- 填充颜色-->
<corners
android:radius="15dp"/>
<!-- 四个角设为圆角-->
</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"/>
<!-- 描边-->
<corners
android:radius="15dp"/>
<!-- 四个角设为圆角-->
</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">
<!-- 按压效果-->
<shape>
<solid android:color="#FFFFFF"/>
<corners android:radius="15dp"/>
</shape>
</item>
<item android:state_pressed="false">
<!-- 没有按压的时候-->
<shape>
<solid android:color="#CC7A00"/>
<corners android:radius="15dp"/>
</shape>
</item>
</selector>
图1
图2
图3