Android新手入门音乐播放器

最新推荐文章于 2021-05-26 03:05:45 发布

原创最新推荐文章于 2021-05-26 03:05:45 发布 · 490 阅读

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文章标签：

#android音乐播放器 #android新手入门项目

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本文详细介绍了一个基于Android平台的音视频播放器实现过程。通过布局文件和Java代码，展示了如何使用MediaPlayer组件进行音视频文件的播放、暂停和停止操作，并处理了外部存储权限请求，确保应用程序能够正确读取音视频文件。

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布局文件activity_main.xml中

 <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical"
        android:gravity="center"
        tools:layout_editor_absoluteX="8dp"
        tools:layout_editor_absoluteY="8dp">

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Play"
            tools:layout_editor_absoluteX="77dp"
            tools:layout_editor_absoluteY="106dp" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Pause"
            tools:layout_editor_absoluteX="77dp"
            tools:layout_editor_absoluteY="106dp" />

        <Button
            android:id="@+id/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Stop"
            tools:layout_editor_absoluteX="77dp"
            tools:layout_editor_absoluteY="106dp" />

    </LinearLayout>

在MainAcitivity.java中：

package com.example.administrator.myapplication;

import android.Manifest;
import android.content.pm.PackageManager;
import android.media.MediaPlayer;
import android.os.Environment;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.os.EnvironmentCompat;
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;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    MediaPlayer mediaPlayer;

    Button btn,btn2,btn3;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mediaPlayer = new MediaPlayer();

        btn = (Button)findViewById(R.id.button);
        btn2 = (Button)findViewById(R.id.button2);
        btn3 = (Button)findViewById(R.id.button3);

        btn.setOnClickListener(this);
        btn2.setOnClickListener(this);
        btn3.setOnClickListener(this);


        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{
            initMediaPlayer();
        }
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.button:
                if(!mediaPlayer.isPlaying()){
                    mediaPlayer.start();
                }
                break;
            case R.id.button2:
                if(mediaPlayer.isPlaying()){
                    mediaPlayer.pause();
                }
                break;
            case R.id.button3:
                if(mediaPlayer.isPlaying()){
                    mediaPlayer.reset();
                    initMediaPlayer();
                }
                break;
            default:
                break;
        }
    }

    protected void onDestroy(){
        super.onDestroy();
        if(mediaPlayer != null){
            mediaPlayer.stop();
            mediaPlayer.release();
        }
    }

    private void initMediaPlayer(){
        try{
            File file = new File(Environment.getExternalStorageDirectory(),"Kalimba.mp3");
            Log.d("test",file.getPath());
            mediaPlayer.setDataSource(file.getPath());
            mediaPlayer.prepare();
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    public void onRequestPermissionsResult(int requestCode,String[] permission,int[] grantResult){
        switch (requestCode){
            case 1:
                if(grantResult.length>0 && grantResult[0] == PackageManager.PERMISSION_GRANTED){
                    initMediaPlayer();
                }else{
                    Toast.makeText(this,"拒绝权限无法使用程序",Toast.LENGTH_LONG).show();
                    finish();
                }
                break;
            default:
                break;
        }
    }


}

还要允许权限：

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