实验7 BindService模拟通信

课程名称

基于Android平台移动互联网开发

实验日期

2016年5月1日

实验项目名称

BindService模拟通信

实验地点

S3012

实验类型

□验证型    √设计型    □综合型

学  时

一、实验目的及要求（本实验所涉及并要求掌握的知识点）

【目的】

实现启动端和BindService之间的双向通信

【要求】

1）   实现从启动端传递一个数据至BindService端；

2）   实现使用BindService服务播放项目源文件中的音乐；

3）   实现在启动端通过“增加”和“降低”两个按钮控制音频音量大小。

4）   实现在启动端通过“暂停”按钮控制音频暂停播放。

二、实验环境（本实验所使用的硬件设备和相关软件）

(1)PC机

(2)操作系统：Windows XP

(3)软件： Eclipse, JDK1.6，Android SDK，ADT

 

 代码如下：

1.Volumeset.java

package com.example.sukodu;

import com.example.sukodu.BackmusicService.Mybinder;

import android.R.string;
import android.annotation.SuppressLint;
import android.app.ActionBar;
import android.app.Activity;
import android.os.Bundle;
import android.os.IBinder;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.Toast;

public class Volumeset extends Activity {
    Bundle bd;
    CheckBox btnsilent;
    SeekBar sbar;
    BackmusicService binde;
    double setting;

    @SuppressLint("NewApi")
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.musicsetting);
        bd = getIntent().getExtras();
        btnsilent = (CheckBox) findViewById(R.id.checkBox1);
        int current = bd.getInt("volum");
        sbar = (SeekBar) findViewById(R.id.seekBar1);
        int music = (int) (((double) current / 14) * 100);
        sbar.setProgress(music);
        binde = ((Mybinder) bd.getBinder("backmusic")).getService();

        Toast.makeText(this, "current volum:" + String.valueOf(music),
                Toast.LENGTH_LONG).show();
        sbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub

                Toast.makeText(Volumeset.this,
                        "current volum:" + String.valueOf((int) setting),
                        Toast.LENGTH_LONG).show();
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
                btnsilent.setChecked(false);
            }

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser) {
                // TODO Auto-generated method stub

                setting = (((double) progress / 100) * 14);
                binde.setvolum((int) setting);
            }
        });
        btnsilent.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {
                // TODO Auto-generated method stub
                binde.setsilent(isChecked);
            }
        });
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
        switch (item.getItemId()) {
        case android.R.id.home: {
            finish();
            break;
        }
        }
        return super.onOptionsItemSelected(item);
    }

}

2.BackmusicService.java

package com.example.sukodu;

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Binder;
import android.os.IBinder;

public class BackmusicService extends Service {
    MediaPlayer mediaplayer;
    Mybinder binder=new Mybinder();
    AudioManager  audioManager;
    int current;
    boolean isSilent=false;
public class Mybinder extends Binder{
    public BackmusicService getService(){
        return BackmusicService.this;
    }
}
    public int getvolum(){
        current =audioManager.getStreamVolume(AudioManager.STREAM_MUSIC );
        return current;
        
    }

    public void setsilent(boolean isSilent){
        if(isSilent){
            getvolum();
            audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,0,0);
            
            }else{
            audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,current,0);//tempVolume:音量绝对值
            }

    }
    public void setvolum(int setting){
        audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,setting,0);
        current=setting;
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return binder;
    }

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        mediaplayer = MediaPlayer.create(BackmusicService.this,
                R.raw.nianlun);
        mediaplayer.start();
         audioManager=(AudioManager) getSystemService(Context.AUDIO_SERVICE);

        super.onCreate();        
        mediaplayer.setOnCompletionListener(new OnCompletionListener() {
            
            @Override
            public void onCompletion(MediaPlayer mp) {
                // TODO Auto-generated method stub
                mediaplayer.start();
            }
        });
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO Auto-generated method stub
        mediaplayer.start();
        return super.onStartCommand(intent, flags, startId);

    }


    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        if(mediaplayer.isPlaying()){
            mediaplayer.stop();
        }
    }

}

3.MainActivity.java

package com.example.sukodu;

import com.example.sukodu.BackmusicService.Mybinder;

import android.annotation.TargetApi;
import android.app.ActionBar;
import android.app.Activity;
import android.app.Service;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Build;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class MainActivity extends Activity {
    private Button exitbtn, aboutbtn, playbtn, chvolBtn;
    private TextView tv1;
    private Mybinder binder;
    BackmusicService bs;
    Bundle bd;
    ServiceConnection conn = new ServiceConnection() {

        @Override
        public void onServiceDisconnected(ComponentName name) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            // TODO Auto-generated method stub
            binder = (Mybinder) service;
            bs = binder.getService();
            int volum = bs.getvolum();
            Toast.makeText(MainActivity.this,
                    "current volum:" + String.valueOf(volum), Toast.LENGTH_LONG)
                    .show();
        }
    };

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        bd = getIntent().getExtras();
        Intent itmusic = new Intent();
        itmusic.setClass(MainActivity.this, BackmusicService.class);
        bindService(itmusic, conn, Context.BIND_AUTO_CREATE);
        ActionBar actionBar = getActionBar();
        actionBar.show();
        ActionBar actionBar1 = getActionBar();// 获取ActionBar对象
        actionBar1.setDisplayShowHomeEnabled(true);// 显示应用程序图标
        actionBar1.setDisplayHomeAsUpEnabled(true);// 将应用程序图标转变为可点击图标，并添加一个返回箭头。
        tv1 = (TextView) findViewById(R.id.textView1);
        Log.i("test", "333333");

        final Intent intent = getIntent(); // 获取Intent对象
        Bundle bundle = intent.getExtras(); // 获取传递的数据包
        tv1.setText("你的名字是：" + bundle.getString("userName"));
        aboutbtn = (Button) findViewById(R.id.about_btn);
        exitbtn = (Button) findViewById(R.id.exit_btn);
        chvolBtn = (Button) findViewById(R.id.VolBtn);

        playbtn = (Button) findViewById(R.id.buttonPlayer);
        playbtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                Intent intent = new Intent();
                intent.setClass(MainActivity.this, MyPlayer.class);
                startActivity(intent);

            }
        });
        exitbtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                // startActivity(intent);
                setResult(0x1717, intent);
                Log.i("test", "444444");

                finish();
            }
        });
        aboutbtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                Intent intent = new Intent();
                intent.setClass(MainActivity.this, SecondActivity.class);
                startActivity(intent);
                // finish();
            }
        });
        chvolBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                Intent intent = new Intent();
                intent.setClass(MainActivity.this, Volumeset.class);
                startActivity(intent);
            }
        });
    }

    public boolean onCreateOptionsMenu(Menu menu) {
        // TODO Auto-generated method stub
        MenuInflater inflater = new MenuInflater(this);
        inflater.inflate(R.menu.main, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
        switch (item.getItemId()) {
        /*
         * case android.R.id.home: // 创建启动MainActivity的Intent Intent intent =
         * new Intent(this, MainActivity.class); //
         * 添加额外的Flag，将Activity栈中处于MainActivity之上的Activity弹出
         * intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
         * startActivity(intent); break;
         */
        case R.id.help:
            Intent intent1 = new Intent(this, Help.class);
            startActivity(intent1);
            // finish();
            break;
        case R.id.about:
            Intent intent2 = new Intent(this, About.class);
            startActivity(intent2);
            // finish();
            break;
        case R.id.newgame:
            Intent intent3 = new Intent(this, New_Game.class);
            startActivity(intent3);
            // finish();
            break;
        default:
            break;
        }
        return super.onOptionsItemSelected(item);
    }

    /*
     * @Override public boolean onCreateOptionsMenu(Menu menu) { // TODO
     * Auto-generated method stub getMenuInflater().inflate(R.menu.main, menu);
     * return true; }
     * 
     * @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO
     * Auto-generated method stub if (item.getItemId()==R.id.set) { Intent
     * intent=new Intent();
     * intent.setClass(MainActivity.this,ShuduSettings.class);
     * startActivity(intent); finish();
     * 
     * } return true; }
     */

}

4.musicsetting.xml

<?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" >

    <SeekBar
        android:id="@+id/seekBar1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <CheckBox
        android:id="@+id/checkBox1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="静音" />

</LinearLayout>

运行截图：

 五、实验总结（对本实验结果进行分析，实验心得体会及改进意见）

这次实验难度很大，耗费了蛮多的时间，遇到的问题有很多，service的相关方法太多有点混淆了。

程序能播放后台音乐，但想调节音量的时候出了点差错，还在改进中。

代码还需继续改进以及完善。

【推广】 免费学中医，健康全家人
原文地址：https://www.cnblogs.com/iTues/p/5470516.html