There are four ways to handle the event, such as the screen shot and the button
1. Use anonymous inner class processing
xml code
<Button
android:id="@+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Anonymous Inner Class "
/>java code
btn1=(Button) findViewById(R.id.btn1);
btn1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(MainActivity.this,"Anonymous Inner Class ",Toast.LENGTH_SHORT).show();
}
});2. Use inner class processing
xml code
<Button
android:id="@+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Inner class"
/>java code
btn2=(Button)findViewById(R.id.btn2);
btn2.setOnClickListener(new MyOnClickListener());
public class MyOnClickListener implements View.OnClickListener{
@Override
public void onClick(View view) {
Toast.makeText(MainActivity.this,"Inner class",Toast.LENGTH_SHORT).show();
}
}3. Use Activity itself as event listener class
xml code
<Button
android:id="@+id/btn3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAllCaps="false"
android:text="Activity"
/>java code
MainActivity needs to be implemented View.OnClickListener
public class MainActivity extends AppCompatActivity implements View.OnClickListener{}And implement the onClick method
@Override
public void onClick(View view) {
Toast.makeText(MainActivity.this,"Activity class",Toast.LENGTH_SHORT).show();
}onCreate method
btn3=(Button)findViewById(R.id.btn3);
btn3.setOnClickListener(this);4. Binding to tags
xml code
Bind the required method on the onClick tag of xml, and write the method name for the attribute value
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="label"
android:onClick="onclickListener"
/>java code
The onclickListener method is added in MainActivity to correspond to the onClick attribute value in xml
public void onclickListener(View source){
Toast.makeText(MainActivity.this,"label",Toast.LENGTH_SHORT).show();
}