获取打开文件的路径

Question

我正在用Java语言创建Android音频播放器。我想在那里实现当打开mp3文件时显示封面艺术的能力。要做到这一点，我需要这个打开的文件的路径，但我不知道它是什么以及如何找到它

点击打开按钮后，Mp3文件从电话光盘打开：

openButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("audio/*");
startActivityForResult(intent, PICK_FILE);
}
});
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_FILE && resultCode == RESULT_OK){
if (data != null){
Uri uri = data.getData();
createMediaPlayer(uri);
}
}
}

//Creating audio player
public void createMediaPlayer(Uri uri){
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioAttributes(
new AudioAttributes.Builder()
.setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
.setUsage(AudioAttributes.USAGE_MEDIA)
.build()
);
try {
mediaPlayer.setDataSource(getApplicationContext(), uri);
mediaPlayer.prepare();
title.setText(getNameFromUri(uri));
openButton.setEnabled(true);
int millis = odtwarzaczAudio.getDuration();
long total_secs = TimeUnit.SECONDS.convert(millis, TimeUnit.MILLISECONDS);
long mins = TimeUnit.MINUTES.convert(total_secs, TimeUnit.SECONDS);
long secs = total_secs - (mins*60);
duration = mins + ":" + secs;
elapse.setText("00:00 / " + duration);
seekBar.setMax(millis);
seekBar.setProgress(0);
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
releaseMediaPlayer();
}
});
} catch (IOException e){
title.setText(e.toString());
}
}

播放器活动：

package com.mc.englishlearn.audioplayer;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.database.Cursor;
import android.media.AudioAttributes;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import com.mc.englishlearn.R;
import java.io.IOException;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
public class PlayerActivity extends AppCompatActivity {
MediaPlayer mediaPlayer;
Button play, replay, open;
SeekBar seekBar;
TextView title, elapse;
String duration;
ScheduledExecutorService timer;
public static final int PICK_FILE =99;
boolean isRepeat = false;

@Override
protected void onCreate (Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_player);
play = (Button)findViewById(R.id.play);
replay = (Button) findViewById(R.id.replay);
open = (Button) findViewById(R.id.open);
seekBar = (SeekBar) findViewById(R.id.seekBar);
title = (TextView) findViewById(R.id.title);
elapse = (TextView) findViewById(R.id.elapsed);
//opening audio file
open.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("audio/*");
startActivityForResult(intent, PICK_FILE);
}
});
//playing audio file
play.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(mediaPlayer != null){
if(mediaPlayer.isPlaying()){
mediaPlayer.pause();
play.setText("ODTWÓRZ");
timer.shutdown();
}else{
mediaPlayer.start();
play.setText("PAUZA");
timer = Executors.newScheduledThreadPool(1);
timer.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
if (mediaPlayer != null) {
if (!seekBar.isPressed()) {
seekBar.setProgress(mediaPlayer.getCurrentPosition());
}
}
}
},10,10, TimeUnit.MILLISECONDS);
}
}
}
});
//Audio line
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
if (mediaPlayer != null){
int millis = mediaPlayer.getCurrentPosition();
long total_secs = TimeUnit.SECONDS.convert(millis, TimeUnit.MILLISECONDS);
long mins = TimeUnit.MINUTES.convert(total_secs, TimeUnit.SECONDS);
long secs = total_secs - (mins*60);
elapse.setText(mins + ":" + secs + " / " + duration);
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
if (mediaPlayer != null) {
mediaPlayer.seekTo(seekBar.getProgress());
}
}
});
//Loop
replay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//repeat = false
if(isRepeat){
isRepeat = false;
mediaPlayer.setLooping(false);
Toast.makeText(PlayerActivity.this, "Tryb powtórki jest wyłączony", Toast.LENGTH_SHORT).show();
}else{
isRepeat = true;
mediaPlayer.setLooping(true);
Toast.makeText(PlayerActivity.this, "Tryb powtórki jest włączony", Toast.LENGTH_SHORT).show();
}
//mediaPlayer.setLooping(true);
// Toast.makeText(PlayerActivity.this, "Repeat if ON", Toast.LENGTH_SHORT).show();
}
});
play.setEnabled(false);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_FILE && resultCode == RESULT_OK){
if (data != null){
Uri uri = data.getData();
createMediaPlayer(uri);
}
}
}

//Creating audio player
public void createMediaPlayer(Uri uri){
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioAttributes(
new AudioAttributes.Builder()
.setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
.setUsage(AudioAttributes.USAGE_MEDIA)
.build()
);
try {
mediaPlayer.setDataSource(getApplicationContext(), uri);
mediaPlayer.prepare();
title.setText(getNameFromUri(uri));
play.setEnabled(true);
int millis = mediaPlayer.getDuration();
long total_secs = TimeUnit.SECONDS.convert(millis, TimeUnit.MILLISECONDS);
long mins = TimeUnit.MINUTES.convert(total_secs, TimeUnit.SECONDS);
long secs = total_secs - (mins*60);
duration = mins + ":" + secs;
elapse.setText("00:00 / " + duration);
seekBar.setMax(millis);
seekBar.setProgress(0);
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
releaseMediaPlayer();
}
});
} catch (IOException e){
title.setText(e.toString());
}
}
@SuppressLint("Range")
public String getNameFromUri(Uri uri){
String fileName = "";
Cursor cursor = null;
cursor = getContentResolver().query(uri, new String[]{
MediaStore.Images.ImageColumns.DISPLAY_NAME
}, null, null, null);
if (cursor != null && cursor.moveToFirst()) {
fileName = cursor.getString(cursor.getColumnIndex(MediaStore.Images.ImageColumns.DISPLAY_NAME));
}
if (cursor != null) {
cursor.close();
}
return fileName;
}

@Override
protected void onDestroy() {
super.onDestroy();
releaseMediaPlayer();
}
public void releaseMediaPlayer(){
if (timer != null) {
timer.shutdown();
}
if (mediaPlayer != null) {
mediaPlayer.release();
mediaPlayer = null;
}
play.setEnabled(false);
elapse.setText("TYTUL");
elapse.setText("00:00 / 00:00");
seekBar.setMax(100);
seekBar.setProgress(0);
}
}

activity_player.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout  xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<SeekBar
android:id="@+id/seekBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toTopOf="@+id/guideline3"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/guideline2" />
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="195dp"
android:layout_marginTop="178dp"
android:layout_marginEnd="216dp"
app:layout_constraintBottom_toTopOf="@+id/guideline4"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="@+id/elapsed"
android:layout_width="74dp"
android:layout_height="34dp"
android:layout_marginStart="177dp"
android:layout_marginEnd="196dp"
android:text="00-00"
app:layout_constraintBottom_toTopOf="@+id/guideline2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.25"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/guideline4"
app:layout_constraintVertical_bias="0.625" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_begin="271dp" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_begin="339dp" />
<LinearLayout
android:id="@+id/linearLayout"
android:layout_width="93dp"
android:layout_height="108dp"
android:layout_marginStart="160dp"
android:layout_marginEnd="158dp"
android:layout_marginBottom="118dp"
android:orientation="vertical"
app:layout_constraintBottom_toTopOf="@+id/replay"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/guideline3">
<Button
android:id="@+id/play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:backgroundTint="@color/green"
android:text="|>" />
<Button
android:id="@+id/open"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Otwórz plik" />
</LinearLayout>
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_begin="213dp" />
<Button
android:id="@+id/replay"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="powtórz"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/guideline5" />

<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_begin="515dp" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_begin="205dp" />
</androidx.constraintlayout.widget.ConstraintLayout>

Answer 1

onActivityResult((方法检索createMediaPlayer((方法中使用的mp3文件Uri。

以便您可以从此Uri获取路径。

编辑：接收到的Uri是一个内容方案Uri，这会使一切变得更加困难。

• 正常Uri：file://mnt/sdcard/song.mp3
• 内容Uri:content://media/external/audio/media/710

查看获取Uri Android 的真实路径