Android之Mediaplayer音乐播放器

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Main3Acticity.java

package csdn.example.com.notification.PlayerAudioTest;import android.Manifest;import android.content.pm.PackageManager;import android.media.MediaPlayer;import android.os.Environment;import android.support.annotation.NonNull;import android.support.v4.app.ActivityCompat;import android.support.v4.content.ContextCompat;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.Toast;import java.io.File;import java.io.IOException;import csdn.example.com.notification.R;public class Main3Activity extends AppCompatActivity implements View.OnClickListener {private MediaPlayer mediaPlayer = new MediaPlayer();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main3);        Button play = (Button) findViewById(R.id.play);        Button pause = (Button) findViewById(R.id.Pause);        Button stop = (Button) findViewById(R.id.stop);        play.setOnClickListener(this);        pause.setOnClickListener(this);        stop.setOnClickListener(this);        if (ContextCompat.checkSelfPermission(Main3Activity.this, Manifest.permission.                WRITE_EXTERNAL_STORAGE)!= PackageManager.PERMISSION_GRANTED){            ActivityCompat.requestPermissions(Main3Activity.this,new String[]{                    Manifest.permission.WRITE_EXTERNAL_STORAGE            },1);        }else {            initMediaPlayer(); //初始化MediaPlayer        }    }    private void initMediaPlayer() {        Log.d("123","到了吗");        File file = new File(Environment.getExternalStorageDirectory(),                "music.mp3");        try {            mediaPlayer.setDataSource(file.getPath()); //指定音频文件的路径            mediaPlayer.prepare(); //让MediaPlayer 进入到准备状态        } catch (IOException e) {            e.printStackTrace();        }    }    @Override    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] 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_SHORT).show();                    finish();                }                break;            default:        }        super.onRequestPermissionsResult(requestCode, permissions, grantResults);    }    @Override    public void onClick(View v) {        switch (v.getId()){            case R.id.play:                if(!mediaPlayer.isPlaying()){                    mediaPlayer.start(); //开始播放                    Toast.makeText(this,"该音频时长为"+mediaPlayer.getDuration()+"毫秒",Toast.LENGTH_SHORT).show();                }                break;            case R.id.Pause:                if(mediaPlayer.isPlaying()){                    //将MediaPlayer对象重置到刚刚创建的状态                    mediaPlayer.pause(); //暂停播放                }                break;            case R.id.stop:                if(mediaPlayer.isPlaying()){                    mediaPlayer.reset(); //停止播放                    initMediaPlayer();                }                break;            default:                break;        }    }    @Override    protected void onDestroy() {        super.onDestroy();        if(mediaPlayer != null){            mediaPlayer.stop();            mediaPlayer.release();        }    }}

运行截图如图所示
这里写图片描述

activity_main3

<?xml version="1.0" encoding="utf-8"?><LinearLayout android:orientation="vertical"    android:layout_height="match_parent"    android:layout_width="match_parent"    xmlns:android="http://schemas.android.com/apk/res/android">    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/play"        android:text="Play"        />    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/Pause"        android:text="Pause"        />    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/stop"        android:text="Stop"        /></LinearLayout>

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