Code

Add a button in the layout file, set listening events for button in the main class, and play music through intent

1. Write 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/btn_click"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:gravity="center"
        android:padding="8dp"
        android:text="@string/click4" />

</LinearLayout>

2. Import music into virtual machine

There is a device file explorer in the lower right corner of Android studio. After opening, you can see the file directory of the virtual machine. Find/MNT/sdcard/music, right-click upload and select the music to be imported. The file name should not appear in Chinese

3. Write mainactivity.class

package com.ch5_2;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;

import java.io.File;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        findViewById(R.id.btn_click4).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setAction(Intent.ACTION_VIEW);
                //Get the file path, the path is the virtual machine memory card path
                Uri data = Uri.fromFile(new File("/mnt/sdcard/Music/nogoodbye.mp3"));
                intent.setDataAndType(data,"audio/*");
                startActivity(intent);
            }
        });
    }
}

Questions

1. Flashback

Here, the version of the virtual machine will affect the operation. If the version is too high, it will flash back. I used to use Android 11.0, but as soon as I click button, it will flash back. The reason should be the compatibility problem. Change to a lower version

here is Android 5.0

2. This file type problem is not supported

When changing to a lower version of the virtual machine, you may encounter the problem that Android music playing software does not support this type of file. I used MP3 file at the beginning, and the result shows that it does not support it. It’s OK to change to WAV format.