In questo articolo rendo pubblico, a titolo di esempio, il codice java principale della mia app CatchTheNote, disponibile in versione completa alla voce di men\u00f9 Android.<\/p>\n\n\n\n
package com.andreabianchini.catchthenote;\n\nimport androidx.appcompat.app.AppCompatActivity;\n\nimport android.content.Intent;\nimport android.media.AudioManager;\nimport android.media.SoundPool;\nimport android.os.Bundle;\nimport android.os.Handler;\nimport android.text.InputFilter;\nimport android.text.Spanned;\nimport android.view.View;\nimport android.widget.Button;\nimport android.widget.EditText;\nimport android.widget.TextView;\nimport android.widget.Toast;\n\nimport com.google.android.gms.ads.AdRequest;\nimport com.google.android.gms.ads.AdView;\nimport com.google.android.gms.ads.MobileAds;\n\nimport java.util.Random;\n\npublic class MainActivity extends AppCompatActivity {\n private SoundPool soundPool;\n private int soundID,tone;\n private int a,as,b,c,cs,d,ds,e,f,fs,g,gs;\n boolean plays = false, loaded = false;\n float actVolume, maxVolume, volume;\n AudioManager audioManager;\n int counter;\n int [] notes=new int[8];\n int [] notesId=new int[8];\n int nnotes=1;\n\n\n @Override\n protected void onCreate(Bundle savedInstanceState) {\n super.onCreate(savedInstanceState);\n setContentView(R.layout.activity_main);\n \/\/ AudioManager audio settings for adjusting the volume\n audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);\n actVolume = (float) audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);\n maxVolume = (float) audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);\n volume = actVolume \/ maxVolume;\n\n \/\/Hardware buttons setting to adjust the media sound\n this.setVolumeControlStream(AudioManager.STREAM_MUSIC);\n\n \/\/ the counter will help us recognize the stream id of the sound played now\n counter = 0;\n\n \/\/ Load the sounds\n soundPool = new SoundPool(10, AudioManager.STREAM_MUSIC, 0);\n soundPool.setOnLoadCompleteListener(new SoundPool.OnLoadCompleteListener() {\n @Override\n public void onLoadComplete(SoundPool soundPool, int sampleId, int status) {\n loaded = true;\n plays=false;\n }\n });\n\n a = soundPool.load(this, R.raw.a, 1);\n as = soundPool.load(this, R.raw.as, 1);\n b = soundPool.load(this, R.raw.b, 1);\n c = soundPool.load(this, R.raw.c, 1);\n cs = soundPool.load(this, R.raw.cs, 1);\n d = soundPool.load(this, R.raw.d, 1);\n ds = soundPool.load(this, R.raw.ds, 1);\n e = soundPool.load(this, R.raw.e, 1);\n f = soundPool.load(this, R.raw.f, 1);\n fs = soundPool.load(this, R.raw.fs, 1);\n g = soundPool.load(this, R.raw.g, 1);\n gs = soundPool.load(this, R.raw.gs, 1);\n\n soundID = a;\n nnotes=1;\n notes[0]=0;\n notesId[0]=a;\n\n Button button = findViewById(R.id.btPlay);\n Button button1 = findViewById(R.id.btA);\n Button btChange = findViewById(R.id.btChange);\n Button btShow = findViewById(R.id.btShow);\n Button btInfo = findViewById(R.id.btInfo);\n EditText etNNotes = findViewById(R.id.etNNotes);\n\n button.setOnClickListener(new View.OnClickListener() {\n @Override\n public void onClick(View v) {\n playSound(v);\n }\n });\n\n button1.setOnClickListener(new View.OnClickListener() {\n @Override\n public void onClick(View v) {\n playA(v);\n }\n });\n\n btChange.setOnClickListener(new View.OnClickListener() {\n @Override\n public void onClick(View v) {\n changeNote(v);\n }\n });\n\n btShow.setOnClickListener(new View.OnClickListener() {\n @Override\n public void onClick(View v) {\n showNote(v);\n }\n });\n\n btInfo.setOnClickListener(new View.OnClickListener() {\n @Override\n public void onClick(View v) {\n showInfo(v);\n }\n });\n\n etNNotes.setFilters(new InputFilter[]{ new InputFilterMinMax(\"1\", \"8\")});\n\n \/\/ Initialize the Mobile Ads SDK\n MobileAds.initialize(this, getString(R.string.admob_app_id));\n\n AdView mBannerAd;\n\n mBannerAd = findViewById(R.id.adView);\n\n AdRequest adRequest = new AdRequest.Builder()\n .build();\n mBannerAd.loadAd(adRequest);\n\n }\n\n public void showInfo(View v) {\n Intent intent = new Intent(MainActivity.this, Info.class);\n startActivity(intent);\n\n }\n\n public void showNote(View v) {\n TextView tv = findViewById(R.id.tvNote);\n EditText etNNotes = findViewById(R.id.etNNotes);\n nnotes = Integer.parseInt(etNNotes.getText().toString());\n String s;\n s=\"\";\n for(int i=0;i<nnotes;i++) {\n switch (notes[i]) {\n case 0:\n s+=\"A \";\n break;\n case 1:\n s+=\"A# \";\n break;\n case 2:\n s+=\"B \";\n break;\n case 3:\n s+=\"C \";\n break;\n case 4:\n s+=\"C# \";\n break;\n case 5:\n s+=\"D \";\n break;\n case 6:\n s+=\"D# \";\n break;\n case 7:\n s+=\"E \";\n break;\n case 8:\n s+=\"F \";\n break;\n case 9:\n s+=\"F# \";\n break;\n case 10:\n s+=\"G \";\n break;\n case 11:\n s+=\"G# \";\n break;\n\n }\n }\n tv.setText(s);\n }\n\n public void changeNote(View v) {\n EditText etNNotes = findViewById(R.id.etNNotes);\n nnotes = Integer.parseInt(etNNotes.getText().toString());\n int last,last1;\n last1=2;\n last=1;\n for(int i=0;i<nnotes;i++) {\n tone=0;\n if (i>1)\n while(tone==last || (Math.abs(tone-last)==1 && Math.abs(last1-last)==1) || (Math.abs(tone-last)==3 && Math.abs(last1-last)==3) || (Math.abs(tone-last)==2 && Math.abs(last1-last)==3) || (Math.abs(tone-last)==3 && Math.abs(last1-last)==2)) {\n tone = new Random().nextInt(12);\n }\n else\n tone = new Random().nextInt(12);\n last1 = last;\n last = tone;\n notes[i]=tone;\n switch (tone) {\n case 0:\n soundID = a;\n break;\n case 1:\n soundID = as;\n break;\n case 2:\n soundID = b;\n break;\n case 3:\n soundID = c;\n break;\n case 4:\n soundID = cs;\n break;\n case 5:\n soundID = d;\n break;\n case 6:\n soundID = ds;\n break;\n case 7:\n soundID = e;\n break;\n case 8:\n soundID = f;\n break;\n case 9:\n soundID = fs;\n break;\n case 10:\n soundID = g;\n break;\n case 11:\n soundID = gs;\n break;\n\n }\n notesId[i]=soundID;\n }\n }\n\n public void playSound(View v) {\n \/\/ Is the sound loaded does it already play?\n TextView tv = findViewById(R.id.tvNote);\n tv.setText(getString(R.string.note));\n\n for (int i=0;i<nnotes;i++){\n if (loaded && !plays) {\n soundPool.play(notesId[i], 1, 1, 0, 0, 1);\n counter = counter++;\n \/\/Toast.makeText(this, \"Played sound\", Toast.LENGTH_SHORT).show();\n \/\/plays = true;\n }\n try { Thread.sleep(1600); }\n catch (InterruptedException ex) { android.util.Log.d(\"Catch the Note\", ex.toString()); } }\n }\n\n public void playA(View v) {\n \/\/ Is the sound loaded does it already play?\n TextView tv = findViewById(R.id.tvNote);\n tv.setText(getString(R.string.note));\n\n if (loaded && !plays) {\n soundPool.play(a, 1, 1, 0, 0, 1);\n counter = counter++;\n \/\/Toast.makeText(this, \"Played sound\", Toast.LENGTH_SHORT).show();\n \/\/plays = true;\n }\n try { Thread.sleep(1600); }\n catch (InterruptedException ex) { android.util.Log.d(\"Catch the Note\", ex.toString()); }\n }\n\n public void playLoop(View v) {\n \/\/ Is the sound loaded does it already play?\n if (loaded && !plays) {\n\n \/\/ the sound will play for ever if we put the loop parameter -1\n soundPool.play(soundID, volume, volume, 1, -1, 1f);\n counter = counter++;\n Toast.makeText(this, \"Plays loop\", Toast.LENGTH_SHORT).show();\n plays = true;\n }\n }\n\n public void pauseSound(View v) {\n if (plays) {\n soundPool.pause(soundID);\n\/\/ soundID = soundPool.load(this, R.raw.beep, counter);\n Toast.makeText(this, \"Pause sound\", Toast.LENGTH_SHORT).show();\n plays = false;\n }\n }\n\n public void stopSound(View v) {\n if (plays) {\n soundPool.stop(soundID);\n\/\/ soundID = soundPool.load(this, R.raw.beep, counter);\n Toast.makeText(this, \"Stop sound\", Toast.LENGTH_SHORT).show();\n plays = false;\n }\n }\n\n public class InputFilterMinMax implements InputFilter {\n\n private int min, max;\n\n public InputFilterMinMax(int min, int max) {\n this.min = min;\n this.max = max;\n }\n\n public InputFilterMinMax(String min, String max) {\n this.min = Integer.parseInt(min);\n this.max = Integer.parseInt(max);\n }\n\n @Override\n public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {\n try {\n int input = Integer.parseInt(dest.toString() + source.toString());\n if (isInRange(min, max, input))\n return null;\n } catch (NumberFormatException nfe) { }\n return \"\";\n }\n\n private boolean isInRange(int a, int b, int c) {\n return b > a ? c >= a && c <= b : c >= b && c <= a;\n }\n }\n }\n\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"In questo articolo rendo pubblico, a titolo di esempio, il codice java principale della mia app CatchTheNote, disponibile in versione completa alla voce di men\u00f9 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