Android进程间通信之内部类作为事件监听器

Posted 2020-09-18 gccbuaa

    在android中，使用内部类能够在当前类里面发用改监听器类，由于监听器类是外部类的内部类。所以能够自由訪问外部类的全部界面组件。

下面是一个调用系统内部类实现短信发送的一个样例：

    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, "短信发送完毕！\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, "短信发送完毕！

\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));
}


}

注意须要加入发送短信的权限到Manfest中：

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

实际上，包括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，从玩儿添加程序后期的维护难度。

假设确实有多个实现监听器须要实现同样的业务逻辑功能。能够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。