Android處理序間通訊之內部類作為事件監聽器

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    在Android中，使用內部類可以在當前類裡面發用改監聽器類，因為監聽器類是外部類的內部類，所以可以自由訪問外部類的所有介面組件。以下是一個調用系統內部類實現簡訊發送的一個例子：

    SMS類：

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,"簡訊發送完成！\n", Toast.LENGTH_LONG).show();

returnfalse;

}

}

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,"簡訊發送完成！\n", Toast.LENGTH_LONG).show();

returnfalse;

}

}

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);
//擷取頁面資訊
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));
}


}

注意需要添加傳送簡訊的許可權到Manfest中：

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

實際上，包含商務邏輯的時間監聽器將導致程式的現實邏輯和商務邏輯耦合，從玩兒增加程式後期的維護難度。

如果確實有多個實現監聽器需要實現相同的商務邏輯功能，可以考慮使用商務邏輯組件來定義商務邏輯功能，再讓事件監聽器來調用商務邏輯組件的商務邏輯方法。