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POHow to manage media player into a piano keyboard in Android ?
 

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  1. POHow to manage media player into a piano keyboard in Android ?
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    <p>I'm trying to make a small piano keyboard but am finding some problems in the management of the media player and the touch of button. This is the code I've written so far:</p> <pre><code>import android.app.Activity; import android.content.pm.ActivityInfo; import android.media.MediaPlayer; import android.os.Bundle; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.view.View.OnClickListener; import android.widget.Button; public class KeyboardPianoActivity extends Activity { Button dooT,reT,miT,faT,solT,laT,siT,doodT,redT,fadT,soldT,ladT,doo1T,re1T,mi1T,fa1T,sol1T,la1T,si1T,doo1dT,re1dT,fa1dT,sol1dT,la1dT,doo2T; MediaPlayer m1; MediaPlayer m2; MediaPlayer m3; MediaPlayer m4; MediaPlayer m5; MediaPlayer m6; MediaPlayer m7,m8,m9,m10,m11,m12; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); setContentView(R.layout.main); dooT = (Button) findViewById(R.id.button1); reT = (Button) findViewById(R.id.button2); miT = (Button) findViewById(R.id.button3); faT = (Button) findViewById(R.id.button4); solT = (Button) findViewById(R.id.button5); laT = (Button) findViewById(R.id.button6); siT = (Button) findViewById(R.id.button7); m1 = MediaPlayer.create(getBaseContext(), R.raw.do1); m2 = MediaPlayer.create(getBaseContext(), R.raw.re); m3 = MediaPlayer.create(getBaseContext(), R.raw.mi); m4 = MediaPlayer.create(getBaseContext(), R.raw.fa); m5 = MediaPlayer.create(getBaseContext(), R.raw.sol); m6 = MediaPlayer.create(getBaseContext(), R.raw.la); m7 = MediaPlayer.create(getBaseContext(), R.raw.si); dooT.setOnClickListener(new OnClickListener(){ public void onClick(View arg0) { m1.start(); } }); reT.setOnClickListener(new OnClickListener(){ public void onClick(View arg0) { m2.start(); } }); miT.setOnClickListener(new OnClickListener(){ public void onClick(View arg0) { m3.start(); } }); faT.setOnClickListener(new OnClickListener(){ public void onClick(View arg0) { m4.start(); } }); solT.setOnClickListener(new OnClickListener(){ public void onClick(View arg0) { m5.start(); } }); } } </code></pre> <p>This is the LogCat:</p> <pre><code>E/AndroidRuntime(29177): FATAL EXCEPTION: main E/AndroidRuntime(29177): java.lang.NullPointerException E/AndroidRuntime(29177): at it.bisemanuDEV.piano.KeyboardPianoActivity$1.onClick(KeyboardPianoActivity.java:71) E/AndroidRuntime(29177): at android.view.View.performClick(View.java:2408) E/AndroidRuntime(29177): at android.view.View$PerformClick.run(View.java:8819) E/AndroidRuntime(29177): at android.os.Handler.handleCallback(Handler.java:603) E/AndroidRuntime(29177): at android.os.Handler.dispatchMessage(Handler.java:92) E/AndroidRuntime(29177): at android.os.Looper.loop(Looper.java:123) E/AndroidRuntime(29177): at android.app.ActivityThread.main(ActivityThread.java:4627) E/AndroidRuntime(29177): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime(29177): at java.lang.reflect.Method.invoke(Method.java:521) E/AndroidRuntime(29177): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) E/AndroidRuntime(29177): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) E/AndroidRuntime(29177): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>I'm still a beginner with programming in Android, and I would like to manage properly the behavior of the button, and the media player, to simulate the operation of a piano keyboard. I hope some of your advice. Thanks</p>
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