Android studio音频播放器报告 android studio设计音乐播放器

转载

bugouhen 2024-08-29 08:18:35

文章标签 android android studio xml ide 文章分类 Android 移动开发

Android studio 音乐盒

项目源码
源码地址布局文件如下：
layout/main.xml

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

	<ImageView
		android:id="@+id/cover"
		android:layout_width="match_parent"
		android:layout_height="600dp"
		android:layout_weight="1"
		android:src="@drawable/composer" />

	<LinearLayout
		android:orientation="vertical"
		android:layout_width="match_parent"
		android:layout_height="300dp"
		android:layout_weight="1">

		<TextView
			android:id="@+id/title"
			android:layout_width="match_parent"
			android:layout_height="20dp"
			android:layout_weight="1"
			android:ellipsize="marquee"
			android:marqueeRepeatLimit="marquee_forever"
			android:text="歌曲名"
			android:gravity="center"
			android:textColor="#000000"
			android:textSize="30dp" />

		<TextView
			android:id="@+id/author"
			android:layout_width="match_parent"
			android:layout_height="wrap_content"
			android:layout_weight="1"
			android:gravity="center"
			android:text="艺术家"
			android:textSize="20dp" />
	</LinearLayout>


	<LinearLayout
		android:orientation="horizontal"
		android:layout_width="match_parent"
		android:layout_height="90dp"
		android:gravity="center"
		android:layout_marginBottom="10dp">
		<ImageButton
			android:id="@+id/pre"
			android:layout_width="wrap_content"

			android:layout_height="wrap_content"
			android:src="@drawable/pre"
			android:background="#FFFFFF"/>
		<ImageButton
			android:id="@+id/play"
			android:layout_width="wrap_content"

			android:layout_height="wrap_content"
			android:src="@drawable/play"
			android:background="#FFFFFF"/>
		<ImageButton
			android:id="@+id/next"
			android:layout_width="wrap_content"

			android:layout_height="wrap_content"
			android:src="@drawable/next"
			android:background="#FFFFFF"/>
		<!--停止在这不太好看，将其宽度设置为0，先隐藏起来-->
		<ImageButton
			android:id="@+id/stop"
			android:layout_width="0dp"
			android:layout_height="wrap_content"
			android:src="@drawable/stop"
			android:background="#FFFFFF"/>
	</LinearLayout>
</LinearLayout>

xml文件配置如下：
AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.xr.musicbox">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name=".MusicService">
        </service>
    </application>

</manifest>

music类代码如下：
MusicService.java

package com.example.xr.musicbox;

import java.io.IOException;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.IBinder;

public class MusicService extends Service
{
	MyReceiver serviceReceiver;
	AssetManager am;
	String[] musics = new String[] { "legendsneverdie.mp3", "promise.mp3",
			"beautiful.mp3" };
	MediaPlayer mPlayer;
	// 当前的状态，0x11代表没有播放；0x12代表正在播放；0x13代表暂停
	int status = 0x11;
	// 记录当前正在播放的音乐
	int current = 0;
	@Override
	public IBinder onBind(Intent intent)
	{
		return null;
	}

	@Override
	public void onCreate()
	{
		super.onCreate();
		am = getAssets();

		// 创建BroadcastReceiver
		serviceReceiver = new MyReceiver();
		// 创建IntentFilter
		IntentFilter filter = new IntentFilter();
		filter.addAction(MainActivity.CTL_ACTION);
		registerReceiver(serviceReceiver, filter);


		// 创建MediaPlayer
		mPlayer = new MediaPlayer();
		// 为MediaPlayer播放完成事件绑定监听器
		mPlayer.setOnCompletionListener(new OnCompletionListener() // ①
		{
			@Override
			public void onCompletion(MediaPlayer mp)
			{
				current++;
				if (current >= 3)
				{
					current = 0;
				}
				//发送广播通知Activity更改文本框
				Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION);
				sendIntent.putExtra("current", current);
				// 发送广播，将被Activity组件中的BroadcastReceiver接收到
				sendBroadcast(sendIntent);
				// 准备并播放音乐
				prepareAndPlay(musics[current]);
			}
		});
	}

	public class MyReceiver extends BroadcastReceiver
{
	@Override
	public void onReceive(final Context context, Intent intent)
	{
		int control = intent.getIntExtra("control", -1);
		switch (control)
		{
			// 播放或暂停
			case 1:
				// 原来处于没有播放状态
				if (status == 0x11)
				{
					// 准备并播放音乐
					prepareAndPlay(musics[current]);
					status = 0x12;
				}
				// 原来处于播放状态
				else if (status == 0x12)
				{
					// 暂停
					mPlayer.pause();
					// 改变为暂停状态
					status = 0x13;
				}
				// 原来处于暂停状态
				else if (status == 0x13)
				{
					// 播放
					mPlayer.start();
					// 改变状态
					status = 0x12;
				}
				break;
			// 停止声音
			case 2:
				// 如果原来正在播放或暂停
				if (status == 0x12 || status == 0x13)
				{
					// 停止播放
					mPlayer.stop();
					status = 0x11;
				}
			case 3:
				current--;
				if(current < 0)
					current = 0;
				prepareAndPlay(musics[current]);
			case 4:
				current++;
				if(current > musics.length-1)
					current = 0;
				prepareAndPlay(musics[current]);
		}
		// 广播通知Activity更改图标、文本框
		Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION);
		sendIntent.putExtra("update", status);
		sendIntent.putExtra("current", current);
		// 发送广播，将被Activity组件中的BroadcastReceiver接收到
		sendBroadcast(sendIntent);
	}
}

	private void prepareAndPlay(String music)
	{
		try
		{
			// 打开指定音乐文件
			AssetFileDescriptor afd = am.openFd(music);
			mPlayer.reset();
			// 使用MediaPlayer加载指定的声音文件。
			mPlayer.setDataSource(afd.getFileDescriptor(),
					afd.getStartOffset(), afd.getLength());
			// 准备声音
			mPlayer.prepare();
			// 播放
			mPlayer.start();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
	}
}

最后配置main.java文件
MainActivity.java

package com.example.xr.musicbox;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener
{
	// 获取界面中显示歌曲标题、作者文本框
	TextView title, author;
	// 播放/暂停、停止按钮
	ImageButton play, stop;

	ImageButton pre, next;

	ActivityReceiver activityReceiver;

	public static final String CTL_ACTION =
			"org.xr.action.CTL_ACTION";
	public static final String UPDATE_ACTION =
			"org.xr.action.UPDATE_ACTION";
	// 定义音乐的播放状态，0x11代表没有播放；0x12代表正在播放；0x13代表暂停
	int status = 0x11;
	String[] titleStrs = new String[] { "Legends Never Die", "约定", "美丽新世界" };
	String[] authorStrs = new String[] { "英雄联盟", "周蕙", "伍佰" };

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		// 获取程序界面界面中的两个按钮
		play = (ImageButton) this.findViewById(R.id.play);
		stop = (ImageButton) this.findViewById(R.id.stop);
		title = (TextView) findViewById(R.id.title);
		author = (TextView) findViewById(R.id.author);
		pre = this.findViewById(R.id.pre);
		next = this.findViewById(R.id.next);

		// 为两个按钮的单击事件添加监听器
		play.setOnClickListener(this);
		stop.setOnClickListener(this);
		pre.setOnClickListener(this);
		next.setOnClickListener(this);

		activityReceiver = new ActivityReceiver();
		// 创建IntentFilter
		IntentFilter filter = new IntentFilter();
		// 指定BroadcastReceiver监听的Action
		filter.addAction(UPDATE_ACTION);
		// 注册BroadcastReceiver
		registerReceiver(activityReceiver, filter);

		Intent intent = new Intent(this, MusicService.class);
		// 启动后台Service
		startService(intent);
	}

	// 自定义的BroadcastReceiver，负责监听从Service传回来的广播
	public class ActivityReceiver extends BroadcastReceiver
{
	@Override
	public void onReceive(Context context, Intent intent)
	{
		// 获取Intent中的update消息，update代表播放状态
		int update = intent.getIntExtra("update", -1);
		// 获取Intent中的current消息，current代表当前正在播放的歌曲
		int current = intent.getIntExtra("current", -1);
		if (current >= 0)
		{
			title.setText(titleStrs[current]);
			author.setText(authorStrs[current]);
		}


		switch (update)
		{
			case 0x11:
				play.setImageResource(R.drawable.play);
				status = 0x11;
				break;
			// 控制系统进入播放状态
			case 0x12:
				// 播放状态下设置使用暂停图标
				play.setImageResource(R.drawable.pause);
				// 设置当前状态
				status = 0x12;
				break;
			// 控制系统进入暂停状态
			case 0x13:
				// 暂停状态下设置使用播放图标
				play.setImageResource(R.drawable.play);
				// 设置当前状态
				status = 0x13;
				break;
		}
	}
}

	@Override
	public void onClick(View source)
	{
		// 创建Intent
		Intent intent = new Intent("org.xr.action.CTL_ACTION");
		switch (source.getId())
		{
			// 按下播放/暂停按钮
			case R.id.play:
				intent.putExtra("control", 1);
				break;
			// 按下停止按钮
			case R.id.stop:
				intent.putExtra("control", 2);
				break;
			case R.id.pre:
				intent.putExtra("control",3);
			case R.id.next:
				intent.putExtra("control",4);
		}
		// 发送广播，将被Service组件中的BroadcastReceiver接收到
		sendBroadcast(intent);
	}
}

运行结果：

Android studio音频播放器报告 android studio设计音乐播放器_xml