Android播放mp3

Android播放mp3
网页
Activity
Service
权限
播放网络mp3异常

TOC

Android播放mp3

网页

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

    <Button
        android:id="@+id/btnPlay"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:text="播放"
        />

    <Button
        android:id="@+id/btnPause"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:text="暂停"
        />

    <Button
        android:id="@+id/btnStop"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:text="停止"
        />

</LinearLayout>

Activity

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import android.Manifest;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.cloudcenter.day05.services.MusicService;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private MusicService.MyBinder myBinder;
    private MyConnection mCon;

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

        init();
    }

    private void init() {
        initView();
        // todo activity 与 service绑定启动
        Intent intent = new Intent(this, MusicService.class);
        //创建链接
        mCon = new MyConnection();
        //设置连接
        bindService(intent, mCon, BIND_AUTO_CREATE);
//        startService();

        // 权限判断，如果没有权限就请求权限(动态)
        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
        } else {
            Toast.makeText(this, "权限已获取！", Toast.LENGTH_SHORT).show();
//            initMediaPlayer();//初始化播放器 MediaPlayer
        }
    }

    private void initView() {
        Button btnPlay = (Button) findViewById(R.id.btnPlay);
        Button btnPause = (Button) findViewById(R.id.btnPause);
        Button btnStop = (Button) findViewById(R.id.btnStop);

        btnPlay.setOnClickListener(this);
        btnPause.setOnClickListener(this);
        btnStop.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        //根据按钮,设置对应的service方法
        switch (view.getId()) {
            case R.id.btnPlay:
                if (null != myBinder) myBinder.onPlay();
                break;
            case R.id.btnPause:
                if (null != myBinder) myBinder.onPause();
                break;
            case R.id.btnStop:
                if (null != myBinder) myBinder.onStop();
                break;
            default:
                break;
        }

    }

    /**
     * todo 连接通道:连接Activity和service
     * 创建之后生成这两个方法就行了，不需要其他操作。
     */
    private class MyConnection implements ServiceConnection {

        @Override
        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
            //创建一个全局变量,获取service中的Binder
            myBinder = ((MusicService.MyBinder) iBinder);

        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {

        }
    }

    /**
     * app获取权限回掉
     *
     * @param requestCode
     * @param permissions
     * @param grantResults
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case 1:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//                    initMediaPlayer();
                } else {
                    Toast.makeText(this, "拒绝权限，将无法使用程序。", Toast.LENGTH_LONG).show();
                    finish();
                }
                break;
            default:
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (null != myBinder) myBinder.onDestroy();
        //断开service连接
        unbindService(mCon);
    }
}

Service

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

import java.io.IOException;

/**
 * todo Service有两种启动方式:
 * onStart:停用了
 * onBind:
 */

public class MusicService extends Service {
    //媒体播放
    private MediaPlayer mMediaPlayer = new MediaPlayer();
    private static final String TAG = "MusicService";
    private boolean isPrepared = false; // 是否准备完毕

    public MusicService() {
    }

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

    @Override
    public void onCreate() {
        super.onCreate();
        //播放
        initMusicPlayer();
    }

    /**
     * 播放本地
     */
    private void initMusicPlayer() {
        try {
            //设置播放地址
            mMediaPlayer.setDataSource("/sdcard/1.mp3");
            //播放。
            mMediaPlayer.prepare();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 播放线上的媒体文件
     */
    private void initNetMusicPlayer() {
        try {

            //Android9开始,不能直接播放http了,所以若是低于Android的手机,直接这样播放没有问题,但是高版本的Android就不能播放了
            mMediaPlayer.setDataSource("http://test-web-back.findmaster.cn:13389/static/good.mp3");
            //使用异步播放
            mMediaPlayer.prepareAsync();
            //添加监听,监听媒体流的加载情况
            mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mediaPlayer) {
                    //加载了内容
                    isPrepared = true;
                    //直接播放
                    mMediaPlayer.start();
                }
            });

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //TODO 创建Binder进行Activity和service的交互
    public class MyBinder extends Binder {

        /**
         * 播放
         */
        public void onPlay() {
            //若是播放网络资源,需要加载好之后才能播放
//            if (!isPrepared) {
//                Toast.makeText(MusicService.this, "还未准备好！", Toast.LENGTH_SHORT).show();
//                return ;
//            }
            if (!mMediaPlayer.isPlaying()) {
                mMediaPlayer.start();
            }
        }

        public void onPause() {
            if (mMediaPlayer.isPlaying()) {
                mMediaPlayer.pause();
            }
        }

        public void onStop() {
            if (mMediaPlayer.isPlaying()) {
                //重新设置
                mMediaPlayer.reset();
                //播放
                initMusicPlayer();
            }
        }

        //销毁
        public void onDestroy() {
            if (null != mMediaPlayer) {
                mMediaPlayer.stop();
                mMediaPlayer.release(); // 释放资源
                mMediaPlayer = null;
            }
        }

    }
}

权限

    <!-- 获取本地的写权限。 -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <!-- 获取本地的读权限。 -->
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

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

播放网络mp3异常

播放的时候,网络不能播放,原因是Android9开始,不能直接播放http了,所以若是低于Android的手机,直接这样播放没有问题,但是高版本的Android就不能播放了.

解决方法:

• 方法1:在AndroidManifest.xml的application标签添加android:usesCleartextTraffic="true"
• 方法2:在访问http之前,调用setCleartextTrafficPermitted(true)