Android进程间通信之内部类作为事件监听器

在Android中，使用内部类可以在当前类里面发用改监听器类，因为监听器类是外部类的内部类，所以可以自由访问外部类的所有界面组件。以下是一个调用系统内部类实现短信发送的一个例子：

SMS类：

package com.example.msmlistener;

import android.app.Activity;

import android.app.PendingIntent;

import android.content.Intent;

import android.telephony.SmsManager;

import android.view.View;

import android.view.View.OnLongClickListener;

import android.widget.EditText;

import android.widget.Toast;

public class SMS
implements OnLongClickListener{

private Activity
act;

private EditText
add;

private EditText
content;

public SMS(Activity act, EditText addr, EditText content){

this.act = act;

this.add = addr;

this.content = content;

}

@Override

public boolean onLongClick(View arg0) {

//
TODO Auto-generated method stub

String addressStr = add.getText().toString();

String contentStr = content.getText().toString();

SmsManager sm = SmsManager.getDefault();

PendingIntent sentIntent = PendingIntent.getBroadcast(act, 0,
new Intent(), 0);

sm.sendTextMessage(addressStr,
null, contentStr, sentIntent, null);

Toast.makeText(act,
"短信发送完成！\n", Toast.LENGTH_LONG).show();

return
false;

}

}

Activity  XML：

package com.example.msmlistener;

import android.app.Activity;

import android.app.PendingIntent;

import android.content.Intent;

import android.telephony.SmsManager;

import android.view.View;

import android.view.View.OnLongClickListener;

import android.widget.EditText;

import android.widget.Toast;

public class SMS
implements OnLongClickListener{

private Activity
act;

private EditText
add;

private EditText
content;

public SMS(Activity act, EditText addr, EditText content){

this.act = act;

this.add = addr;

this.content = content;

}

@Override

public boolean onLongClick(View arg0) {

//
TODO Auto-generated method stub

String addressStr = add.getText().toString();

String contentStr = content.getText().toString();

SmsManager sm = SmsManager.getDefault();

PendingIntent sentIntent = PendingIntent.getBroadcast(act, 0,
new Intent(), 0);

sm.sendTextMessage(addressStr,
null, contentStr, sentIntent, null);

Toast.makeText(act,
"短信发送完成！\n", Toast.LENGTH_LONG).show();

return
false;

}

}

Activity JAVA：

package com.example.msmlistener;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.widget.Button;

import android.widget.EditText;

public class MainActivity extends Activity {

EditText address;

EditText content;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//获取页面信息

address = (EditText)findViewById(R.id.address);

content = (EditText)findViewById(R.id.content);

Button btnsend = (Button)findViewById(R.id.send);

btnsend.setOnLongClickListener(new SMS(this, address, content));

}

}

注意需要添加发送短信的权限到Manfest中：

<uses-permission
android:name="android.permission.SEND_SMS"/>

实际上，包含业务逻辑的时间监听器将导致程序的现实逻辑和业务逻辑耦合，从玩儿增加程序后期的维护难度。

如果确实有多个实现监听器需要实现相同的业务逻辑功能，可以考虑使用业务逻辑组件来定义业务逻辑功能，再让事件监听器来调用业务逻辑组件的业务逻辑方法。

Android进程间通信之内部类作为事件监听器