安卓学习笔记四

最新推荐文章于 2025-04-14 22:26:17 发布

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最新推荐文章于 2025-04-14 22:26:17 发布

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分类专栏：安卓学习日记文章标签：学习 java android ui 开发语言

本文链接：https://blog.youkuaiyun.com/qq_52641282/article/details/127538353

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该博客主要围绕Java中Server的学习展开，介绍了Server的创建与功能，阐述媒体文件的创建方法，讲解通过bind方式启动和结束音乐，以及使用bind方式与Server进行数据传输，最后给出了完整代码示例。

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1 servers的学习

1.1 servers的创建与功能的介绍

1 servers的学习

1.1 servers的创建与功能的介绍

1.2 媒体文件的创建

1.3 通过bind的方式来启动和结束音乐

1.4 使用bind方式进行与serves的数据传输

1.5 完整代码

首先先创建一个server

首先简单的创建一个xml页面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <Button
        android:id="@+id/start_music_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="start" />

    <Button
        android:id="@+id/stop_music_botton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="stop" />
</LinearLayout>

然后再创建个页面绑定下按钮

package com.example.work;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class Music_activity extends AppCompatActivity implements View.OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_music);
        Button start_button =findViewById(R.id.start_music_button);
        Button stop_button =findViewById(R.id.stop_music_botton);
        start_button.setOnClickListener(this);
        stop_button.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.start_music_button:
                startService(new Intent(Music_activity.this,music_Service.class));
                break;
            case R.id.stop_music_botton:
                stopService(new Intent(Music_activity.this,music_Service.class));
                break;
        }
    }
}

接下来再创建个service

package com.example.work;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class music_Service extends Service {
    public music_Service() {
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Toast.makeText(this,"onCreate: ", Toast.LENGTH_LONG).show();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        Toast.makeText(this,"onStartCommand: ", Toast.LENGTH_LONG).show();
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Toast.makeText(this,"onDestroy: ", Toast.LENGTH_LONG).show();

    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }
}

1.2 媒体文件的创建

首先声明一个媒体播放器

private MediaPlayer musicplayer;

然后创建一个资源管理的文件夹

在这里面选择raw

然后就可以把你喜欢的音乐放入其中了

musicplayer=MediaPlayer.create(this,R.raw.happy_music);

通过这种方式可以读取你的音乐

musicplayer.start();
musicplayer.stop();

通过这两种方式可以启动和结束你的音乐

1.3 通过bind的方式来启动和结束音乐

依旧是新创建一对bind，然后绑定按钮

onbind的方式相比较之前的方式会多一种serviceconnection，首先要创建这一个serviceconnection

private ServiceConnection mserviceConnection =new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {

        }
    }

bind启动音乐和结束音乐的方式

startService(new Intent(Music_activity.this,music_Service.class));
bindService(new Intent(Music_activity.this,music_Service.class),mserviceConnection,BIND_AUTO_CREATE);

unbindService(mserviceConnection);
stopService(new Intent(Music_activity.this,music_Service.class));

1.4 使用bind方式进行与serves的数据传输

先比较直接start，stop的方式，bind方式启动serves方式可以与serves进行数据交流，下面将介绍如何与serves进行数据交流

首先我们创建一个内部类

private IBinder iBinder=new LocalBinder();
 public class LocalBinder extends Binder{
        music_Service getService(){
            return music_Service.this;
        }
    }

然后将ibinder进行一个return

public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        return iBinder;
    }

private ServiceConnection mserviceConnection =new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
        music_Service.LocalBinder localBinder = (music_Service.LocalBinder) service;

        music_Service musicService= localBinder.getService();

        }

        @Override
        public void onServiceDisconnected(ComponentName name) {

        }
    };

bind和serves的运行周期

如果你曾经绑定过，但是没有解绑，那么服务就无法被销毁

这样就可以通过自定义函数的方式，来进行数据的传递了

1.5 完整代码

Music_activity

package com.example.work;

import androidx.appcompat.app.AppCompatActivity;

import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;
import android.widget.Button;

public class Music_activity extends AppCompatActivity implements View.OnClickListener {
    private ServiceConnection mserviceConnection =new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
        music_Service.LocalBinder localBinder = (music_Service.LocalBinder) service;

        music_Service musicService= localBinder.getService();

        }

        @Override
        public void onServiceDisconnected(ComponentName name) {

        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_music);
        Button start_button =findViewById(R.id.start_music_button);
        Button stop_button =findViewById(R.id.stop_music_botton);
        start_button.setOnClickListener(this);
        stop_button.setOnClickListener(this);

        Button bind_start_button =findViewById(R.id.bind_start_music_button);
        Button bind_stop_button =findViewById(R.id.bind_stop_music_botton);
        bind_start_button.setOnClickListener(this);
        bind_stop_button.setOnClickListener(this);



    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.start_music_button:
                startService(new Intent(Music_activity.this,music_Service.class));
                break;
            case R.id.stop_music_botton:
                stopService(new Intent(Music_activity.this,music_Service.class));
                break;
            case R.id.bind_start_music_button:
                startService(new Intent(Music_activity.this,music_Service.class));
                bindService(new Intent(Music_activity.this,music_Service.class),mserviceConnection,BIND_AUTO_CREATE);
                break;
            case R.id.bind_stop_music_botton:
                unbindService(mserviceConnection);
                stopService(new Intent(Music_activity.this,music_Service.class));
                break;
        }
    }
}

music_Service

package com.example.work;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class music_Service extends Service {
    private MediaPlayer musicplayer;
    private IBinder iBinder=new LocalBinder();

    public music_Service() {
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Toast.makeText(this,"onCreate: ", Toast.LENGTH_LONG).show();
        musicplayer=MediaPlayer.create(this,R.raw.happy_music);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        Toast.makeText(this,"onStartCommand: ", Toast.LENGTH_LONG).show();
        musicplayer.start();
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        musicplayer.stop();
        super.onDestroy();
        Toast.makeText(this,"onDestroy: ", Toast.LENGTH_LONG).show();

    }

    @Override
    public IBinder onBind(Intent intent) {

        // TODO: Return the communication channel to the service.
        return iBinder;
    }
    public class LocalBinder extends Binder{
        music_Service getService(){
            return music_Service.this;
        }
    }
}