我想使用 Android 媒体播放器根据用户输入（例如 5,10 等）播放歌曲“n”次。
For 循环未按预期工作 请指导我如何实现这一目标。
我使用了“onCompletion”，但它没有按预期工作，但无限循环的默认重复正在工作。
package com.example.vsr1.setitplayerversion2;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Random;
import java.util.Timer;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.FragmentManager;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;
public class MainActivity extends Activity implements OnCompletionListener, SeekBar.OnSeekBarChangeListener {
private ImageButton btnPlay;
private ImageButton btnForward;
private ImageButton btnBackward;
private ImageButton btnNext;
private ImageButton btnPrevious;
private ImageButton btnPlaylist;
private ImageButton btnRepeat;
private ImageButton btnShuffle;
private SeekBar songProgressBar;
private TextView songTitleLabel;
private TextView songCurrentDurationLabel;
private TextView songTotalDurationLabel;
private Dialog supportDialog;
private RadioButton selectedBtn;
private Context ctx;
// Media Player
private MediaPlayer mp;
// Handler to update UI timer, progress bar etc,.
private Handler mHandler = new Handler();;
private SongsManager songManager;
private Utilities utils;
private int seekForwardTime = 5000; // 5000 milliseconds
private int seekBackwardTime = 5000; // 5000 milliseconds
private int currentSongIndex = 0;
private boolean isShuffle = false;
private boolean isRepeat = false;
private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
private TextView songRepeatLabel;
private TextView songRepeatCount;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.player);
ctx = this;
// All player buttons
btnPlay = (ImageButton) findViewById(R.id.btnPlay);
btnForward = (ImageButton) findViewById(R.id.btnForward);
btnBackward = (ImageButton) findViewById(R.id.btnBackward);
btnNext = (ImageButton) findViewById(R.id.btnNext);
btnPrevious = (ImageButton) findViewById(R.id.btnPrevious);
btnPlaylist = (ImageButton) findViewById(R.id.btnPlaylist);
btnRepeat = (ImageButton) findViewById(R.id.btnRepeat);
btnShuffle = (ImageButton) findViewById(R.id.btnShuffle);
songProgressBar = (SeekBar) findViewById(R.id.songProgressBar);
songTitleLabel = (TextView) findViewById(R.id.songTitle);
songCurrentDurationLabel = (TextView) findViewById(R.id.songCurrentDurationLabel);
songTotalDurationLabel = (TextView) findViewById(R.id.songTotalDurationLabel);
songRepeatLabel = (TextView) findViewById(R.id.txtRepeatLabel);
songRepeatCount = (TextView) findViewById(R.id.txtRepeatCount);
// Mediaplayer
mp = new MediaPlayer();
songManager = new SongsManager();
utils = new Utilities();
// Listeners
songProgressBar.setOnSeekBarChangeListener(this); // Important
mp.setOnCompletionListener(this); // Important
mp.setLooping(false);
// Getting all songs list
songsList = songManager.getPlayList(Environment.getExternalStorageDirectory());
//Button showDialog = (Button)findViewById(R.id.sh)
// By default play first song
//if(songsList!=null && songsList.size()>0) playSong(0);
/**
* Play button click event
* plays a song and changes button to pause image
* pauses a song and changes button to play image
* */
btnPlay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// check for already playing
if(mp.isPlaying()){
if(mp!=null){
mp.pause();
// Changing button image to play button
btnPlay.setImageResource(R.drawable.btn_play);
}
}else{
// Resume song
if(mp!=null){
mp.start();
// Changing button image to pause button
btnPlay.setImageResource(R.drawable.btn_pause);
}
}
}
});
/**
* Forward button click event
* Forwards song specified seconds
* */
btnForward.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// get current song position
int currentPosition = mp.getCurrentPosition();
// check if seekForward time is lesser than song duration
if(currentPosition + seekForwardTime <= mp.getDuration()){
// forward song
mp.seekTo(currentPosition + seekForwardTime);
}else{
// forward to end position
mp.seekTo(mp.getDuration());
}
}
});
/**
* Backward button click event
* Backward song to specified seconds
* */
btnBackward.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// get current song position
int currentPosition = mp.getCurrentPosition();
// check if seekBackward time is greater than 0 sec
if(currentPosition - seekBackwardTime >= 0){
// forward song
mp.seekTo(currentPosition - seekBackwardTime);
}else{
// backward to starting position
mp.seekTo(0);
}
}
});
/**
* Next button click event
* Plays next song by taking currentSongIndex + 1
* */
btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// check if next song is there or not
if(currentSongIndex < (songsList.size() - 1)){
playSong(currentSongIndex + 1);
currentSongIndex = currentSongIndex + 1;
}else{
// play first song
playSong(0);
currentSongIndex = 0;
}
}
});
/**
* Back button click event
* Plays previous song by currentSongIndex - 1
* */
btnPrevious.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(currentSongIndex > 0){
playSong(currentSongIndex - 1);
currentSongIndex = currentSongIndex - 1;
}else{
// play last song
playSong(songsList.size() - 1);
currentSongIndex = songsList.size() - 1;
}
}
});
/**
* Button Click event for Repeat button
* Enables repeat flag to true
* */
btnRepeat.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(isRepeat){
isRepeat = false;
Toast.makeText(getApplicationContext(), "Repeat is OFF", Toast.LENGTH_SHORT).show();
btnRepeat.setImageResource(R.drawable.btn_repeat);
}else{
// make repeat to true
isRepeat = true;
Toast.makeText(getApplicationContext(), "Repeat is ON", Toast.LENGTH_SHORT).show();
showDialog(); // call popup
songRepeatCount.setText(String.valueOf(initialRepeatCount));
// make shuffle to false
isShuffle = false;
btnRepeat.setImageResource(R.drawable.btn_repeat_focused);
btnShuffle.setImageResource(R.drawable.btn_shuffle);
}
}
});
/**
* Button Click event for Shuffle button
* Enables shuffle flag to true
* */
btnShuffle.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(isShuffle){
isShuffle = false;
Toast.makeText(getApplicationContext(), "Shuffle is OFF", Toast.LENGTH_SHORT).show();
btnShuffle.setImageResource(R.drawable.btn_shuffle);
}else{
// make repeat to true
isShuffle= true;
Toast.makeText(getApplicationContext(), "Shuffle is ON", Toast.LENGTH_SHORT).show();
// make shuffle to false
isRepeat = false;
btnShuffle.setImageResource(R.drawable.btn_shuffle_focused);
btnRepeat.setImageResource(R.drawable.btn_repeat);
}
}
});
/**
* Button Click event for Play list click event
* Launches list activity which displays list of songs
* */
btnPlaylist.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Intent i = new Intent(getApplicationContext(), PlayListActivity.class);
startActivityForResult(i, 100);
}
});
}
/**
* Receiving song index from playlist view
* and play the song
* */
@Override
protected void onActivityResult(int requestCode,
int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode == 100){
currentSongIndex = data.getExtras().getInt("songIndex");
// play selected song
playSong(currentSongIndex);
}
}
/**
* Function to play a song
* @param songIndex - index of song
* */
public void playSong(int songIndex){
// Play song
try {
if(songsList!=null && songsList.size()>0) {
mp.reset();
mp.setDataSource(songsList.get(songIndex).get("songPath"));
mp.prepare();
mp.start();
// Displaying Song title
String songTitle = songsList.get(songIndex).get("songTitle");
songTitleLabel.setText(songTitle);
// Changing Button Image to pause image
btnPlay.setImageResource(R.drawable.btn_pause);
// set Progress bar values
songProgressBar.setProgress(0);
songProgressBar.setMax(100);
// Updating progress bar
updateProgressBar();
}
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Update timer on seekbar
* */
public void updateProgressBar() {
mHandler.postDelayed(mUpdateTimeTask, 100);
}
/**
* Background Runnable thread
* */
private Runnable mUpdateTimeTask = new Runnable() {
public void run() {
long totalDuration = mp.getDuration();
long currentDuration = mp.getCurrentPosition();
// Displaying Total Duration time
songTotalDurationLabel.setText(""+utils.milliSecondsToTimer(totalDuration));
// Displaying time completed playing
songCurrentDurationLabel.setText(""+utils.milliSecondsToTimer(currentDuration));
// Updating progress bar
int progress = (int)(utils.getProgressPercentage(currentDuration, totalDuration));
//Log.d("Progress", ""+progress);
songProgressBar.setProgress(progress);
// Running this thread after 100 milliseconds
mHandler.postDelayed(this, 100);
}
};
/**
*
* */
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {
}
/**
* When user starts moving the progress handler
* */
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// remove message Handler from updating progress bar
mHandler.removeCallbacks(mUpdateTimeTask);
}
/**
* When user stops moving the progress hanlder
* */
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
mHandler.removeCallbacks(mUpdateTimeTask);
int totalDuration = mp.getDuration();
int currentPosition = utils.progressToTimer(seekBar.getProgress(), totalDuration);
// forward or backward to certain seconds
mp.seekTo(currentPosition);
// update timer progress again
updateProgressBar();
}
private int initialRepeatCount;
private Timer initialRepeatTimerValue;
/**
* On Song Playing completed
* if repeat is ON play same song again
* if shuffle is ON play random song
* */
@Override
public void onCompletion(MediaPlayer arg0) {
int count = 0;
// check for repeat is ON or OFF
if(isRepeat)
{
if(initialRepeatCount>0)
{
// initial Repeat song
count=initialRepeatCount;
for (int i=count;i>=1; i--){
songRepeatCount.setText(String.valueOf(count));
playSong(currentSongIndex);
Toast.makeText(getApplicationContext(), "Repeat ", Toast.LENGTH_SHORT).show();
count=i;
}
// Next song repeat same count
if(songsList!=null && currentSongIndex < (songsList.size() - 1)){
currentSongIndex = currentSongIndex + 1;
count=initialRepeatCount;
for (int i=count;i>=1; i--){
playSong(currentSongIndex);
count=i;
Toast.makeText(getApplicationContext(), "Next song Repeat ", Toast.LENGTH_SHORT).show();
songRepeatCount.setText(String.valueOf(count));
}
}
else
{
// play first song
playSong(0);
currentSongIndex = 0;
count=initialRepeatCount;
for (int i=count;i>=1; i--){
playSong(currentSongIndex);
count=i;
songRepeatCount.setText(String.valueOf(count));
}
}
}
// inital Timer value
/* else if (Timer.value)
{
}*/
// default Repeat
else
{ // repeat is on play same song again
playSong(currentSongIndex);
}
}
else if(isShuffle)
{
// shuffle is on - play a random song
Random rand = new Random();
currentSongIndex = rand.nextInt((songsList.size() - 1) - 0 + 1) + 0;
playSong(currentSongIndex);
} else
{
// no repeat or shuffle ON - play next song
if(songsList!=null && currentSongIndex < (songsList.size() - 1))
{
playSong(currentSongIndex + 1);
Toast.makeText(getApplicationContext(), "Default next song ", Toast.LENGTH_SHORT).show();
currentSongIndex = currentSongIndex + 1;
}else
{
// play first song
playSong(0);
currentSongIndex = 0;
}
}
}
@Override
public void onDestroy(){
super.onDestroy();
mp.release();
}
public void showDialog(){
supportDialog = new Dialog(ctx,android.R.style.Theme_Black_NoTitleBar);
supportDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
supportDialog.setContentView(R.layout.user_input_fragment); // add your custom layout pop up
supportDialog.setCancelable(true);
supportDialog.setCanceledOnTouchOutside(true); // if it is set false if you touch outside of the popup ,popup will not close.
supportDialog.setTitle("Set Repeat");
WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
Window window = supportDialog.getWindow();
lp.copyFrom(window.getAttributes());
//This makes the dialog take up the full width
lp.width = WindowManager.LayoutParams.MATCH_PARENT; // it will take respective mobile screen hight and width
lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
window.setAttributes(lp);
//supportDialog.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT)); // enable to set color transparant
final RadioGroup rgrp;
final EditText txt2;
final TimePicker tp;
// TextView txtRepeatValue;
//TextView txtRepeatLabel;
Button ok;
Button cancel;
rgrp = (RadioGroup)supportDialog.findViewById(R.id.rgrp);
txt2 = (EditText)supportDialog.findViewById(R.id.txt2);
tp = (TimePicker)supportDialog.findViewById(R.id.txt3);
ok = (Button)supportDialog.findViewById(R.id.ok_btn);
cancel =(Button)supportDialog.findViewById(R.id.cancel_btn);
tp.setIs24HourView(true);
txt2.setVisibility(View.GONE);
tp.setVisibility(View.GONE);
rgrp.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
int id = rgrp.getCheckedRadioButtonId();
View radioButton = rgrp.findViewById(id);
// Check which radio button was clicked
switch (radioButton.getId()) {
case R.id.rb1:
txt2.setVisibility(View.GONE);
tp.setVisibility(View.GONE);
break;
case R.id.rb2:
txt2.setVisibility(View.VISIBLE);
tp.setVisibility(View.GONE);
txt2.setFocusable(true);
txt2.setCursorVisible(true);
break;
case R.id.rb3:
tp.setVisibility(View.VISIBLE);
txt2.setVisibility(View.GONE);
tp.setFocusable(true);
break;
}
}
});
supportDialog.show();
ok.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int id = rgrp.getCheckedRadioButtonId();
View radioButton = rgrp.findViewById(id);
// Check which radio button was clicked
switch (radioButton.getId()) {
case R.id.rb1:
Toast.makeText(ctx, "default selected", Toast.LENGTH_LONG).show();
supportDialog.dismiss();
break;
case R.id.rb2:
Toast.makeText(ctx, "set count edit text value " + txt2.getText().toString(), Toast.LENGTH_LONG).show();
initialRepeatCount = Integer.parseInt(txt2.getText().toString());
songRepeatLabel.setText("Repeat :");
songRepeatCount.setText(txt2.getText());
supportDialog.dismiss();
break;
case R.id.rb3:
String strDateTime = tp.getCurrentHour() + " : " + tp.getCurrentMinute();
Toast.makeText(ctx, "Timer selected " + strDateTime, Toast.LENGTH_LONG).show();
supportDialog.dismiss();
break;
}
}
});
cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
supportDialog.cancel();
}
});
}
}
您可以尝试以下
mp.setLooping(false);编辑
请在媒体播放器对象上设置完整的侦听器，例如
mp.setOnCompletionListener(this);
您可以通过以下方式实现您的要求。
可以设置mp.setLooping(false).设置计数器增加1
onCompletion(MediaPlayer mediaPlayer) if(count==total){
//create method to change the song
changetheSongorreleaseMediaplayer();
}
else{
//create method to replay the song
replaythesamesong();
}