Develop Reference

Sound when counter reaches specific time? Android

first of all pardon my English, but I think it's understandable.
So in this app is a counter and I need it to do sound when it reaches for example 30 seconds.
note: this is my first question here so if I broke any rules or I could have asked better way, let me know please
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Chronometer;
public class MainActivity extends AppCompatActivity {
private Button mStartButton;
private Button mPauseButton;
private Button mResetButton;
private Chronometer mChronometer;
private long lastPause;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mStartButton = (Button) findViewById(R.id.start_button);
mPauseButton = (Button) findViewById(R.id.pause_button);
mResetButton = (Button) findViewById(R.id.reset_button);
mChronometer = (Chronometer) findViewById(R.id.chronometer);
mStartButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (lastPause != 0){
mChronometer.setBase(mChronometer.getBase() + SystemClock.elapsedRealtime() - lastPause);
}
else{
mChronometer.setBase(SystemClock.elapsedRealtime());
}
mChronometer.start();
mStartButton.setEnabled(false);
mPauseButton.setEnabled(true);
}
});
mPauseButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
lastPause = SystemClock.elapsedRealtime();
mChronometer.stop();
mPauseButton.setEnabled(false);
mStartButton.setEnabled(true);
}
});
mResetButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mChronometer.stop();
mChronometer.setBase(SystemClock.elapsedRealtime());
lastPause = 0;
mStartButton.setEnabled(true);
mPauseButton.setEnabled(false);
}
});
}
}

Define global integer variable as counter and count it in Chronometer's OnChronometerTickListener, and when it reach for example 30 then play sound and reset your counter:
int c = -1; // define global
chronometer.setOnChronometerTickListener(new Chronometer.OnChronometerTickListener() {
#Override
public void onChronometerTick(Chronometer chronometer) {
c++;
if(c == 30) {
c = 0;
MediaPlayer mp = MediaPlayer.create(getApplicationContext(), R.raw.ding);
mp.start();
}
}
});

Adding onClick method inside onPrepare

First of all, I'm new to Java. Second, my intents here are as follows:
User clicks button (playPause) -> button toggles to pause drawable (pause1) and stream begins and user clicks button -> stream pauses and button toggles to play drawable(play1).
Now my problem is how to implement this behavior, an onClick method, inside of the current method playPauseMusic which contains an onPrepared method that is used to prepare the MediaPlayer asynchronously.
My intuition is to make a check for isPlaying and toggle from there, but my attempts so far have ended in failure.
Here is the relevant code and thank you for your time:
radio.java
package com.example.jacob.wutk;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import java.io.IOException;
public class radio extends AppCompatActivity {
/** Called when the user touches the button */
public void playMusic(View view) throws IOException {
String url = "http://streamer.cci.utk.edu:8000/wutk-vorbis"; // your URL here
MediaPlayer mediaPlayer = new MediaPlayer();
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
public void onPrepared(MediaPlayer mediaPlayer){
mediaPlayer.start();
}
});
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setDataSource(url);
mediaPlayer.prepareAsync();
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_radio);
}
}

I hope this helps.
public class radio extends AppCompatActivity {
MediaPlayer mediaPlayer;
boolean prepared=false;
public void playMusic(View view) throws IOException {
playpause();
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_radio);
mediaPlayer = new MediaPlayer();
String url = "http://streamer.cci.utk.edu:8000/wutk-vorbis";
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setDataSource(url);
mediaPlayer.prepareAsync();
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
public void onPrepared(MediaPlayer mediaPlayer){
prepared=ture;
}
});
}
}
public void playPause() {
if (!mediaplayer.isPlaying()&&prepared) {
mediaplayer.start();
mediaplayer.setImageResource(R.drawable.ic_pause);
} else if(mediaplayer.isPlaying()) {
mediaplayer.pause();
mediaplayer.setImageResource(R.drawable.ic_play);
}
}

Storing Integer value after app close and retrieve it

I have no clue how to fix this, please help!
I am creating a counter app that shows numbers every time user press a button. It starts from 0 and to a maximum of 9999. My problem is that after the user closes the app it again starts from 0 but what I want is display the last number the user pressed instead of 0 when user open app again. I tried many shared preference codes but none of them worked. Here is my code:
import android.content.Context;
import android.content.SharedPreferences;
import android.media.MediaPlayer;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private int x;
Context context = this;
MediaPlayer mp;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TextView number=(TextView) findViewById(R.id.numbers);
ImageButton btn_count=(ImageButton) findViewById(R.id.btn_countn);
ImageButton btn_reset=(ImageButton) findViewById(R.id.btn_resetn);
mp = MediaPlayer.create(context, R.raw.button_press);
number.setText(String.format("%04d", x)+"");
btn_count.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
if (mp.isPlaying()) {
mp.stop();
mp.release();
mp = MediaPlayer.create(context, R.raw.button_press);
} mp.start();
} catch(Exception e) { e.printStackTrace(); }
x = x +1;
number.setText(String.format("%04d", x)+"");
}
});
btn_reset.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
if (mp.isPlaying()) {
mp.stop();
mp.release();
mp = MediaPlayer.create(context, R.raw.button_press);
} mp.start();
} catch(Exception e) { e.printStackTrace(); }
x=0;
number.setText(String.format("%04d", x)+"");
}
});
}
}

You will need to use the Android Preferences for this:
How?
define when the app is getting closed and then call a method where you can write the actual value of the counter
Example
SharedPreferences buttonCounterValue = getSharedPreferences("counter", Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = buttonCounterValue.edit();
editor.putInt("myCounter", i); //
editor.commit();
and when the app is open again you will need to call another method and read it back...
Example:
SharedPreferences buttonCounterValue = getPreferences(Activity.MODE_PRIVATE);
int storedCounter = buttonCounterValue.getInt("myCounter", 0);
so validate what you store and check if the preference you get is 0, that means nothing was stored before, so you can beging the game from 0...

Using SharedPreferences you can do something like this:
public class MainActivity extends AppCompatActivity {
private int x;
SharedPreferences prefs;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
prefs = PreferenceManager.getDefaultSharedPreferences(this);
x = prefs.getInt("count", 0);
final TextView number=(TextView) findViewById(R.id.numbers);
ImageButton btn_count=(ImageButton) findViewById(R.id.btn_countn);
ImageButton btn_reset=(ImageButton) findViewById(R.id.btn_resetn);
number.setText(String.valueOf(x));
btn_count.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
x++;
prefs.edit().putInt("count", x).apply();
number.setText(String.valueOf(x));
}
});
btn_reset.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
x=0;
prefs.edit().putInt("count", x).apply();
number.setText(String.valueOf(x));
}
});
}
}

Android - How to re-start MainActivity after clicking a button in another class?

so I'm fairly new to Android. Lemme just explain first:
I'm trying to make a small portable music app, just for my phone and to test my skills/review what I've learned. I have the mainactivity setup to pick a song with 1 of 4 buttons, and it'll start another activity with buttons to pause, resume, and go back to the song selection screen (MainActivity). I'm trying to get the back button to both release the player and finish the activity, and I've tried many different things but nothing seems to work; the app closes due to some exception (a common one being NullPointerException).
So here's MainActivity:
package me.lemmy.portablemusic.app;
import android.media.MediaPlayer;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
public class MainActivity extends ActionBarActivity {
Button wreckingBall, happy, lig, ligMulti;
Intent songPickedActivity = new Intent("me.lemmy.portablemusic.app.SONGPICKED");
public static MediaPlayer player;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//set buttons
wreckingBall = (Button) findViewById(R.id.song_wreck);
happy = (Button) findViewById(R.id.song_happy);
lig = (Button) findViewById(R.id.song_lig);
ligMulti = (Button) findViewById(R.id.song_lig_multi);
//listeners
wreckingBall.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(songPickedActivity);
player = MediaPlayer.create(MainActivity.this, R.raw.wrecking_ball);
player.start();
}
});
happy.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(songPickedActivity);
player = MediaPlayer.create(MainActivity.this, R.raw.happy);
player.start();
}
});
lig.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(songPickedActivity);
player = MediaPlayer.create(MainActivity.this, R.raw.let_it_go);
player.start();
}
});
ligMulti.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(songPickedActivity);
player = MediaPlayer.create(MainActivity.this, R.raw.let_it_go_multi);
player.start();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public static MediaPlayer getPlayer(){
return player;
}
}
and here's my SongPicked activity:
package me.lemmy.portablemusic.app;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.media.MediaPlayer;
import android.widget.TextView;
/**
* Created by Lemuel on 6/20/14.
*/
public class SongPicked extends Activity {
TextView text;
Button pause, resume, back;
MediaPlayer player;
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_songpicked);
text = (TextView) findViewById(R.id.tvPlaying);
pause = (Button) findViewById(R.id.buttonPause);
resume = (Button) findViewById(R.id.buttonResume);
back = (Button) findViewById(R.id.buttonBack);
player = MainActivity.getPlayer();
pause.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
player.pause();
}
});
resume.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
player.start();
}
});
back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view){
player.release();
}
});
}
#Override
protected void onPause(){
super.onPause();
finish();
}
}
Any help is appreciated, thanks!
P.S. I know I can't use copyrighted music in my apps, this is just a test.

I suggest to first make sure the activity is in the AndroidManifest file. Second is to change your intent from this:
Intent songPickedActivity = new Intent("me.lemmy.portablemusic.app.SONGPICKED");
into:
Intent songPickedActivity = new Intent(this, SongPicked.class);
Do it as well on the songPickedActivity when going back to MainActivity. You can use putExtra to send data to next intent. For more information click this link.

How to add two buttons in eclipse one for playing an mp3 file and the other for stopping it

I am a newbie in android app development. For now my challenge is to add two buttons in my UI one for playing an mp3 file and the other for stopping it. I am able to do the first successfully and as I try to do the stop one, I see no result. My code is as following:
package ir.polyglotcenter.childrenmostfrequentwords;
import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Main extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button myButtonOne = (Button) findViewById(R.id.btn_audio);
myButtonOne.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
MediaPlayer media = MediaPlayer.create(Main.this, R.raw.audio);
media.start();
}
});
//this is to stop the audio flow
Button myButtonTwo = (Button) findViewById(R.id.btn_stop);
myButtonTwo.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
MediaPlayer media = MediaPlayer.create(Main.this, R.raw.audio);
media.stop();
}
});
}
}

Try this code:
public class Main extends Activity {
protected MediaPlayer mMediaPlayer;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mMediaPlayer = MediaPlayer.create(Main.this, R.raw.audio);
Button myButtonOne = (Button) findViewById(R.id.btn_audio);
myButtonOne.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
mMediaPlayer.prepare();
mMediaPlayer.start();
}
});
//this is to stop the audio flow
Button myButtonTwo = (Button) findViewById(R.id.btn_stop);
myButtonTwo.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if(mMediaPlayer.isPlaying())
mMediaPlayer.stop();
}
});
}
}

Play and Stop all song for all rows.
The Point is implement MediaPlayer in the loop of if or any loop you have:
if(playandstop==true){
mp=MediaPlayer.create(MainActivity.this, resourceIIIDD);
mp.start();
playandstop=false;
}else{
mp.stop();
playandstop=true;
}