音乐播放器
XML文件
主页面布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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"
android:orientation="vertical"
tools:context=".MainActivity">
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="9">
</ListView>
<SeekBar
android:id="@+id/seek"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="@+id/button_start"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="播放"
android:textSize="25dp"
android:onClick="click"/>
<Button
android:id="@+id/button_pause"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="暂停"
android:textSize="25dp"
android:onClick="click"/>
<Button
android:id="@+id/button_last"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="上一首"
android:textSize="25dp"
android:onClick="click"/>
<Button
android:id="@+id/button_next"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="下一首"
android:textSize="25dp"
android:onClick="click"/>
</LinearLayout>
</LinearLayout>
listView小布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/text_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="25dp"/>
<TextView
android:id="@+id/text_artist"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"
android:layout_below="@id/text_title"
android:layout_marginTop="10dp"/>
<TextView
android:id="@+id/text_duration"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"
android:layout_alignParentRight="true"
android:layout_marginRight="10dp"
android:layout_alignBottom="@id/text_artist"/>
</RelativeLayout>
JAVA代码
实体类
package com.example.day17_02.entity;
public class Music {
private String title;
private String artist;
private String duration;
private String data;
private String size;
public Music() {
}
public Music(String title, String artist, String duration, String data, String size) {
this.title = title;
this.artist = artist;
this.duration = duration;
this.data = data;
this.size = size;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getArtist() {
return artist;
}
public void setArtist(String artist) {
this.artist = artist;
}
public String getDuration() {
return duration;
}
public void setDuration(String duration) {
this.duration = duration;
}
public String getData() {
return data;
}
public void setData(String data) {
this.data = data;
}
public String getSize() {
return size;
}
public void setSize(String size) {
this.size = size;
}
@Override
public String toString() {
return "Music{" +
"title='" + title + '\'' +
", artist='" + artist + '\'' +
", duration='" + duration + '\'' +
", data='" + data + '\'' +
", size='" + size + '\'' +
'}';
}
}
适配器类
package com.example.day17_02.Adapter;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import com.example.day17_02.R;
import com.example.day17_02.entity.Music;
import java.util.List;
public class MusicAdapter extends BaseAdapter {
private List<Music> lists;
private Context context;
public MusicAdapter(List<Music> list, Context context) {
this.lists = list;
this.context = context;
}
@Override
public int getCount() {
return lists.size();
}
@Override
public Object getItem(int i) {
return lists.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
ViewHolder holder = null;
if (view == null){
holder = new ViewHolder();
view = View.inflate(context, R.layout.item_layout,null);
holder.text_artist = view.findViewById(R.id.text_artist);
holder.text_duration = view.findViewById(R.id.text_duration);
holder.text_title = view.findViewById(R.id.text_title);
view.setTag(holder);
}else {
holder = (ViewHolder) view.getTag();
}
holder.text_title.setText(lists.get(i).getTitle());
holder.text_duration.setText(lists.get(i).getDuration());
holder.text_artist.setText(lists.get(i).getArtist());
return view;
}
private class ViewHolder{
private TextView text_title,text_artist,text_duration;
}
}
Util类
package com.example.day17_02.Util;
import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.provider.MediaStore;
import com.example.day17_02.entity.Music;
import java.util.ArrayList;
import java.util.List;
public class MusicUtil {
public static List<Music> getMusic(Context context){
List<Music> lists = new ArrayList<>();
Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
ContentResolver contentResolver = context.getContentResolver();
Cursor cursor = contentResolver.query(uri, null, null, null, null);
if (cursor != null){
while (cursor.moveToNext()){
String title = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));
String artist = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));
String duration = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION));
String data = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));
String size = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.SIZE));
Music music = new Music(title, artist, duration, data, size);
lists.add(music);
}
cursor.close();
return lists;
}
return null;
}
}
Activity类
package com.example.day17_02;
import androidx.appcompat.app.AppCompatActivity;
import android.Manifest;
import android.media.MediaPlayer;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SeekBar;
import android.widget.Toast;
import com.example.day17_02.Adapter.MusicAdapter;
import com.example.day17_02.Util.MusicUtil;
import com.example.day17_02.entity.Music;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private List<Music> lists;
private MusicAdapter adapter;
private ListView listView;
private MediaPlayer mediaPlayer;
private SeekBar seek;
private Timer timer = new Timer();
private int index = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
seek = findViewById(R.id.seek);
listView = findViewById(R.id.listView);
seek.setProgress(0);
mediaPlayer = new MediaPlayer();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.READ_EXTERNAL_STORAGE},1);
}
seek.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
if (b == true){
mediaPlayer.seekTo(i);
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
lists = new MusicUtil().getMusic(this);
Log.i(TAG, "" + lists);
adapter = new MusicAdapter(lists, this);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
index = i;
seek.setProgress(0);
mediaPlayer.reset();
try {
seek.setMax(Integer.parseInt(lists.get(i).getDuration()));
mediaPlayer.setDataSource(lists.get(i).getData());
mediaPlayer.prepare();
mediaPlayer.start();
} catch (IOException e) {
e.printStackTrace();
}
}
});
timer.schedule(new TimerTask() {
@Override
public void run() {
seek.setProgress(mediaPlayer.getCurrentPosition());
}
},0,1000);
}
public void click(View view) {
switch (view.getId()){
case R.id.button_start:
mediaPlayer.start();
break;
case R.id.button_pause:
mediaPlayer.pause();
break;
case R.id.button_last:
index--;
mediaPlayer.reset();
try {
mediaPlayer.setDataSource(lists.get(index).getData());
mediaPlayer.prepare();
mediaPlayer.start();
} catch (IOException e) {
e.printStackTrace();
}
break;
case R.id.button_next:
index++;
mediaPlayer.reset();
try {
mediaPlayer.setDataSource(lists.get(index).getData());
mediaPlayer.prepare();
mediaPlayer.start();
} catch (IOException e) {
e.printStackTrace();
}
break;
}
}
}
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