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新建个项目修改AndroidManifest.xml,在manifest标签下添加<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
修改activity_main.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">
<Button
android:id="@+id/play"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="play"/>
<Button
android:id="@+id/pause"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="pause"/>
<Button
android:id="@+id/stop"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="stop"/>
</LinearLayout>
修改mainactivity.javapackage com.example.xinwei.playaudiotest;
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.view.View;
import android.widget.Button;
import android.widget.Toast;
import java.io.File;
import java.io.IOException;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private MediaPlayer mediaPlayer=new MediaPlayer();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button play=(Button)findViewById(R.id.play);
Button pause=(Button)findViewById(R.id.pause);
Button stop=(Button)findViewById(R.id.stop);
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 view) {
switch (view.getId()){
case R.id.play:
if(!mediaPlayer.isPlaying()){
mediaPlayer.start();
}
break;
case R.id.pause:
if(!mediaPlayer.isPlaying()){
mediaPlayer.pause();
}
break;
case R.id.stop:
if(!mediaPlayer.isPlaying()){
mediaPlayer.reset();
initMediaPlayer();
}
break;
default:
break;
}
}
private void initMediaPlayer() {
File file=new File(Environment.getExternalStorageDirectory(),"music.np3");
try {
mediaPlayer.setDataSource(file.getPath());
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
}
@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, "denied permission will not use program", Toast.LENGTH_SHORT).show();
finish();
}
break;
default:
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(mediaPlayer!=null){
mediaPlayer.stop();
mediaPlayer.release();
}
}
}
因为模拟器里没有mp3文件所以点击按钮也没用 |