Introduction to the use of the callback interface in Android

MainActivity is as follows:

 
package cn.testcallback; 
import android.os.Bundle; 
import android.widget.Toast; 
import android.app.Activity; 
/** 
* Demo describe : 
* Android The use of the callback interface in  
*/ 
public class MainActivity extends Activity { 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.main); 
init(); 
} 
private void init() { 
for (int i = 0; i < 10000; i++) { 
if (i == 9527) { 
showToast(i, new CallBackInterface() { 
@Override 
public void callBackFunction(int i) { 
Toast.makeText(MainActivity.this, " My number :"+i, Toast.LENGTH_LONG).show(); 
} 
}); 
} 
} 
} 
// Define a function , Among them 1 The parameters for CallBackInterface type  
private void showToast(int i, CallBackInterface callBackInterface) { 
callBackInterface.callBackFunction(i); 
} 

// Defines the interface . And is defined in the interface 1 A method of  
public interface CallBackInterface { 
public void callBackFunction(int i); 
} 
} 

main. xml as follows:

 
<RelativeLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
> 
<TextView 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:text="@string/hello_world" 
android:layout_centerInParent="true" 
/> 
</RelativeLayout>