Simple Music player code for Android.
Here i want to write about my first experience in Android Dev.
This application just play embedded in application mp3 file. That’s all.
In first step i create a simple Android UI. Below you can see this:
The source text (main.xml) of this UI is:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:id="@+id/widget31"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<Button
android:text="@string/play_str"
android:textSize="15pt"
android:textStyle="bold"
android:id="@+id/ButtonPlayStop"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<SeekBar
android:id="@+id/SeekBar01"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_below="@id/ButtonPlayStop"/>
</RelativeLayout>
In my simple mp3 media player i have few string constans, like “PLAY”, “PAUSE”, etc. The best practice is place this constats in special part of project. That part call values. In this part i Eclipse create for me strings.xml file and change it. Bellow you can see strings.xml content:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Android mp3 player</string>
<string name="play_str">PLAY</string>
<string name="pause_str">PAUSE</string>
</resources>
It’s very simple and useful practice.
Next i make changes in Activity file (Mp3player.java). Bellow i give you some comments about it:
package com.hrupin.mp3player;
import com.hrupin.mp3player.R;
import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.SeekBar;
public class Mp3player extends Activity {
private Button buttonPlayStop;
private MediaPlayer mediaPlayer;
private SeekBar seekBar;
private final Handler handler = new Handler();
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
initViews();
}
private void initViews() {
buttonPlayStop = (Button) findViewById(R.id.ButtonPlayStop);
buttonPlayStop.setOnClickListener(new OnClickListener() {@Override public void onClick(View v) {buttonClick();}});
mediaPlayer = MediaPlayer.create(this, R.raw.testsong_20_sec);
seekBar = (SeekBar) findViewById(R.id.SeekBar01);
seekBar.setMax(mediaPlayer.getDuration());
seekBar.setOnTouchListener(new OnTouchListener() {@Override public boolean onTouch(View v, MotionEvent event) {
seekChange(v);
return false; }
});
}
public void startPlayProgressUpdater() {
seekBar.setProgress(mediaPlayer.getCurrentPosition());
if (mediaPlayer.isPlaying()) {
Runnable notification = new Runnable() {
public void run() {
startPlayProgressUpdater();
}
};
handler.postDelayed(notification,1000);
}else{
mediaPlayer.pause();
buttonPlayStop.setText(getString(R.string.play_str));
seekBar.setProgress(0);
}
}
// This is event handler thumb moving event
private void seekChange(View v){
if(mediaPlayer.isPlaying()){
SeekBar sb = (SeekBar)v;
mediaPlayer.seekTo(sb.getProgress());
}
}
// This is event handler for buttonClick event
private void buttonClick(){
if (buttonPlayStop.getText() == getString(R.string.play_str)) {
buttonPlayStop.setText(getString(R.string.pause_str));
try{
mediaPlayer.start();
startPlayProgressUpdater();
}catch (IllegalStateException e) {
mediaPlayer.pause();
}
}else {
buttonPlayStop.setText(getString(R.string.play_str));
mediaPlayer.pause();
}
}
}
