1.   Inherit listening interface .

2.  xml The way : Set up android:onClick

3. Inner class

4. An anonymous class

---------------------------------------------------------------

1. Realization OnClickListener Interface

package com.itheima28.caller;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText; /**
* @author andong
* Just run the program on the display of the interface
*/
public class MainUI4 extends Activity implements OnClickListener { /**
* Call back this method when the interface is just created
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); // This code must be executed . Perform the initialization of the parent class . setContentView(R.layout.main); // Set the layout of the current interface . // Connection method
Button btnCall = (Button) findViewById(R.id.btn_call);

// Register to listen
btnCall.setOnClickListener(this);
} //
// If you use inner classes , Then the external class , There is no need to achieve OnClickListener Interface
// class MyOnClickListener implements OnClickListener {
//
// @Override
// public void onClick(View v) {
// System.out.println("MainUI3 Dial the number ..");
// call();
// }
// } /**
* How to make a call
*/
private void call() { // 1. Take out the number in the input box
EditText etNumber = (EditText) findViewById(R.id.number); // Input box object
String number = etNumber.getText().toString(); // The number to be dialed // 2. Make a call according to the number
Intent intent = new Intent(); // Create an intention
intent.setAction(Intent.ACTION_CALL); // Specify its action as a call
intent.setData(Uri.parse("tel:" + number)); // Specify the number to be dialed
startActivity(intent); // Perform this action
} @Override
public void onClick(View v) {
System.out.println("MainUI4 Dial the number ..");
call();
}
}

2 .  xml The way

In layout file xml, add to onClick event , then , From code ,

<Button
android:id ="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_contetn"
android:text=" single click "
android:onClick="clicktest" // Add event
/>

From code , add to clicktest Method , Prototype , Want to be with View.OnClickListener Like a prototype not implemented in , Add (View v) Method parameters of

// Prototypes of methods , And OnClickListener Method prototypes defined in , Agreement .
public void clicktest(View view){ Log.i("Test"," With xml The way , Set up events ")
}

3.   Inner class

This way, , Easy to understand .

// 1. Declare control 
private Button btn; @override
protected void onCreate(Bundle savedInstanceState) {
supper.onCreate(savedInstanceState); setContentView(R.layou.activity_main); // 2. Control Association
btn =(Button)findViewById(R.id.button1); Listener list = new Listener();
// 3. Register to listen
btn.setOnClickListener(
// Class objects that implement interfaces
list
);
} // Inner class
class Listener implements View.OnClickListener { @override
public void onClick(View v){
// The callback method
Log.i("TEST"," It's been clicked ");
} }

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