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  • 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! ", 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!

    ", 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。

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  • 原文地址:https://www.cnblogs.com/gccbuaa/p/6848550.html
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