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import android.Manifest;

import android.content.pm.PackageManager;

import android.media.MediaPlayer;

import android.os.Bundle;

import android.support.v4.app.ActivityCompat;

import android.support.v4.content.ContextCompat;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ImageButton;

import android.widget.ListView;

import android.widget.SeekBar;

import android.widget.TextView;

import android.widget.Toast;

import java.io.IOException;

import java.util.List;

public class MainActivity extends AppCompatActivity implements View.OnClickListener, SeekBar.OnSeekBarChangeListener {

TextView name=null;

TextView time=null;

ListView list=null;

ImageButton bef=null;

ImageButton las=null;

ImageButton stop=null;

SeekBar lev=null;

MyListAdapter listAdapter;

private List allList_= null;

MediaPlayer mediaPlayer=new MediaPlayer();

int p;MP3 mp3;long kk;

@Override

protected void onDestroy() {

super.onDestroy();

mediaPlayer.reset();

}

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

name=(TextView) findViewById(R.id.textView_MusicName);

time=(TextView) findViewById(R.id.time);

list=(ListView)findViewById(R.id.Music_List);

bef=(ImageButton) findViewById(R.id.bef);

las=(ImageButton) findViewById(R.id.las);

stop=(ImageButton) findViewById(R.id.stop);

lev=(SeekBar) findViewById(R.id.seekBar);

time=(TextView) findViewById(R.id.time);

bef.setOnClickListener(this);

las.setOnClickListener(this);

stop.setOnClickListener(this);

lev.setOnSeekBarChangeListener(this);

if(ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)

!= PackageManager.PERMISSION_GRANTED){

ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},1);

}else {

allList_ = DateUtils.getAllList(MainActivity.this);

listAdapter = new MyListAdapter(this, allList_);

list.setAdapter(listAdapter);

}

list.setOnItemClickListener(new AdapterView.OnItemClickListener() {

@Override

public void onItemClick(AdapterView> parent, View view, int position, long id) {

p = position;

mp3 = allList_.get(p);

playSong();

}

});

mediaPlayer.setOnCompletionListener(new CompletionListener());

}

private void updateSeekBar(){

runOnUiThread(new Runnable() {

@Override

public void run() {

kk=mediaPlayer.getCurrentPosition();

lev.setProgress((int)kk);

lev.postDelayed(this,1000);

}

});

}

public static String formatTime(long time) {

String min = time / (1000 * 60) + "";

String sec = time % (1000 * 60) + "";

if (min.length() < 2) {

min = "0" + time / (1000 * 60) + "";

} else {

min = time / (1000 * 60) + "";

}

if (sec.length() == 4) {

sec = "0" + (time % (1000 * 60)) + "";

} else if (sec.length() == 3) {

sec = "00" + (time % (1000 * 60)) + "";

} else if (sec.length() == 2) {

sec = "000" + (time % (1000 * 60)) + "";

} else if (sec.length() == 1) {

sec = "0000" + (time % (1000 * 60)) + "";

}

return min + ":" + sec.trim().substring(0, 2);

}

@Override

public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

time.setText(formatTime(kk));

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

mediaPlayer.seekTo(lev.getProgress());

}

private final class CompletionListener implements MediaPlayer.OnCompletionListener {

@Override

public void onCompletion(MediaPlayer mp) {

if(!mediaPlayer.isPlaying()) {

nextsong();

}

}

}

private void playSong() {

try {

mediaPlayer.reset();

mediaPlayer.setDataSource(mp3.getUrl());

mediaPlayer.prepare();

mediaPlayer.start();

lev.setMax(mediaPlayer.getDuration());

updateSeekBar();

} catch (IOException e) {

e.printStackTrace();

}

}

private void nextsong() {

if(p!=list.getCount()-1) {

p++;

mp3 = allList_.get(p);

playSong();

}else{

p=0;

mp3 = allList_.get(p);

playSong();

}

}

public void onClick(View v){

switch(v.getId()){

case R.id.bef:

if(p!=0) {

p--;

mp3 = allList_.get(p);

playSong();

}else {

int d=list.getCount()-1;

mp3 = allList_.get(d);

playSong();

}

break;

case R.id.las:

int l=list.getCount()-1;

if(p!=l) {

nextsong();

}else {

p=0;

mp3 = allList_.get(p);

playSong();

}

break;

case R.id.stop:

if(mediaPlayer.isPlaying()){

mediaPlayer.pause();

}else{

mediaPlayer.start();

}

break;

default:break;

}

}

public void onRequestPermissionsResult(int requestCode,String[] permissions ,int[] grantResults) {

switch (requestCode) {

case 1:

if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

allList_ = DateUtils.getAllList(MainActivity.this);

listAdapter = new MyListAdapter(this, allList_);

list.setAdapter(listAdapter);

} else {

Toast.makeText(this, "!!!!!", Toast.LENGTH_SHORT).show();

finish();

}

}

}

}