In this tutorial you will get android button example.
在本教程中，您将获得android按钮示例。
Button is a very basic and commonly used UI widget of Android. It can be pressed or clicked and we can perform some action on its click event.
Button是Android的一个非常基本且常用的UI小部件。 可以按下或单击它，我们可以对其单击事件执行一些操作。
We can define a button in XML layout by using <Button> tag. In this tutorial I have given an example in which if the user presses the button then a message is displayed in Toast.
我们可以使用<Button>标签在XML布局中定义一个按钮。 在本教程中，我给出了一个示例，其中如果用户按下按钮，则会在Toast中显示一条消息。
We can handle the click event on button in two ways.
我们可以通过两种方式处理按钮上的click事件。
-
Using OnClickListener
使用OnClickListener
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Using android:onClick
使用android：onClick
Android按钮示例 (Android Button Example)
OnClickListener (OnClickListener)
We can handle button click event by using OnClickListener in following way.
我们可以通过以下方式使用OnClickListener处理按钮单击事件。
Create a new project with package name thecrazyprogrammer.androidexample and add following code in respective files.
使用包名称thecrazyprogrammer.androidexample创建一个新项目，并在相应文件中添加以下代码。
activity_main.xml
activity_main.xml
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<?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"
android:gravity="center">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btn"
android:text="Click Here"/>
</LinearLayout>
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<? 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"
android : gravity = "center" >
<Button
android : layout_width = "match_parent"
android : layout_height = "wrap_content"
android : id = "@+id/btn"
android : text = "Click Here" />
</LinearLayout>
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MainActivity.java
MainActivity.java
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package thecrazyprogrammer.androidexample;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
Button btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button)findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this,"You Clicked Me :)",Toast.LENGTH_LONG).show();
}
});
}
}
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Screenshot
屏幕截图
In case you use more than one button in Activity then you have to apply OnClickListener separately on each button as shown below.
如果在“活动”中使用多个按钮，则必须分别对每个按钮应用OnClickListener，如下所示。
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button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//code for work to perform on button1 click comes here
}
});
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//code for work to perform on button2 click comes here
}
});
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button1 . setOnClickListener ( new View . OnClickListener ( ) {
@Override
public void onClick ( View v ) {
//code for work to perform on button1 click comes here
}
} ) ;
button2 . setOnClickListener ( new View . OnClickListener ( ) {
@Override
public void onClick ( View v ) {
//code for work to perform on button2 click comes here
}
} ) ;
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android：onClick (android:onClick)
We can also handle click event by assigning a method to button in XML layout by using android:onClick attribute. When button is clicked, the associated method is called. Make sure the method is public void and accept View as a parameter. See below example to learn how to implement this.
我们还可以通过使用android：onClick属性为XML布局中的按钮分配一个方法来处理click事件。 单击按钮时，将调用关联的方法。 确保该方法是public void并接受View作为参数。 请参见以下示例，以了解如何实现此目的。
Create a new project with package name thecrazyprogrammer.androidexample and add following code in respective files.
使用包名称thecrazyprogrammer.androidexample创建一个新项目，并在相应文件中添加以下代码。
activity_main.xml
activity_main.xml
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<?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"
android:gravity="center">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btn"
android:text="Click Here"
android:onClick="btnAction"/>
</LinearLayout>
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<? 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"
android : gravity = "center" >
<Button
android : layout_width = "match_parent"
android : layout_height = "wrap_content"
android : id = "@+id/btn"
android : text = "Click Here"
android : onClick = "btnAction" />
</LinearLayout>
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MainActivity.java
MainActivity.java
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package thecrazyprogrammer.androidexample;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
Button btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button)findViewById(R.id.btn);
}
public void btnAction(View view){
Toast.makeText(MainActivity.this,"You Clicked Me :)",Toast.LENGTH_LONG).show();
}
}
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package thecrazyprogrammer . androidexample ;
import android . app . Activity ;
import android . os . Bundle ;
import android . view . View ;
import android . widget . Button ;
import android . widget . Toast ;
public class MainActivity extends Activity {
Button btn ;
@Override
protected void onCreate ( Bundle savedInstanceState ) {
super . onCreate ( savedInstanceState ) ;
setContentView ( R . layout . activity_main ) ;
btn = ( Button ) findViewById ( R . id . btn ) ;
}
public void btnAction ( View view ) {
Toast . makeText ( MainActivity . this , "You Clicked Me :)" , Toast . LENGTH_LONG ) . show ( ) ;
}
}
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In above example I have used method name as btnAction. You can give its name according to you.
在上面的示例中，我将方法名称用作btnAction 。 您可以根据自己的名字命名。
In case you use more than one button in Activity then click event for each button can be handled in following way.
如果您在“活动”中使用多个按钮，则可以通过以下方式处理每个按钮的单击事件。
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public void btnAction(View view){
if(view.getId()==R.id.button1){
//code for work to perform on button1 click comes here
}
if(view.getId()==R.id.button2){
//code for work to perform on button2 click comes here
}
}
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public void btnAction ( View view ) {
if ( view . getId ( ) == R . id . button1 ) {
//code for work to perform on button1 click comes here
}
if ( view . getId ( ) == R . id . button2 ) {
//code for work to perform on button2 click comes here
}
}
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Comment below if you have any queries related to above android button example.
如果您有与上述android按钮示例相关的任何查询，请在下面评论。
翻译自: https://www.thecrazyprogrammer.com/2016/08/android-button-example.html