カテゴリー: Java

import cn.sherlock.com.sun.media.sound.SF2Soundbank;
import cn.sherlock.com.sun.media.sound.SoftSynthesizer;
import jp.kshoji.javax.sound.midi.Instrument;
import jp.kshoji.javax.sound.midi.InvalidMidiDataException;
import jp.kshoji.javax.sound.midi.MidiUnavailableException;

SF2Soundbank drumsSF = new SF2Soundbank(mContext.getAssets().open("drums.sf2"));
SoftSynthesizer drums = new SoftSynthesizer();
metronome.loadAllInstruments(drumsSF);
for (int i = 0; i < drumsSF.getInstruments().length; i++) {
  Instrument inst = drumsSF.getInstruments()[i];
  Log.d("MyTest", "name" + inst.getName());
  Log.d("MyTest", "bank" + inst.getPatch().getBank());
  Log.d("MyTest", "program" + inst.getPatch().getProgram());
  Log.d("MyTest", "==========");
}
// programChange(bank, program)
drums.getChannels()[0].programChange(0, 115);

import cn.sherlock.com.sun.media.sound.SF2Soundbank;
import cn.sherlock.com.sun.media.sound.SoftSynthesizer;
import jp.kshoji.javax.sound.midi.InvalidMidiDataException;
import jp.kshoji.javax.sound.midi.MidiSystem;
import jp.kshoji.javax.sound.midi.MidiUnavailableException;
import jp.kshoji.javax.sound.midi.Receiver;
import jp.kshoji.javax.sound.midi.ShortMessage;
// minimum setup for playing notes without using a Sequencer
// it plays random 3rd dyad each time
SF2Soundbank sf = new SF2Soundbank(getAssets().open("steinway.sf2"));
SoftSynthesizer synth = new SoftSynthesizer();
synth.open();
synth.loadAllInstruments(sf);
Receiver recv = synth.getReceiver;
ShortMessage msg = new ShortMessage();
int max = 72;
int min = 36;
int num = (int)Math.floor(Math.random()*(max-min)+min);
try {
  msg.setMessage(ShortMessage.NOTE_ON, 0, num, 127);
  recv.send(msg, synth.getMicrosecondPosition());
  msg.setMessage(ShortMessage.NOTE_ON, 0, num+4, 127);
  recv.send(msg, synth.getMicrosecondPosition());
}

public class MainActivity extends AppCompatActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    int screenHeight = Resources.getSystem().getDisplayMetrics().heightPixels;

    LinearLayout layout = new LinearLayout(this);
    layout.setGravity(Gravity.CENTER);
    setContentView(layout);

    RelativeLayout circleView = new RelativeLayout(this);
    GradientDrawable gd = new GradientDrawable();
    gd.setSize(screenHeight/3, screenHeight/3);
    gd.setColor(Color.WHITE);
    gd.setStroke(10, Color.GRAY);
    gd.setCornerRadius(screenHeight/3/2);
    circleView.setBackground(gd);
    layout.addView(circleView);

    TextView tvTop = new TextView(this);
    tvTop.setText("Top");
    tvTop.setTextSize(50);
    RelativeLayout.LayoutParams tvTopLP = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
    tvTopLP.addRule(RelativeLayout.ALIGN_PARENT_TOP);
    tvTopLP.addRule(RelativeLayout.CENTER_HORIZONTAL);
    tvTopLP.topMargin = screenHeight / 3 / 5;
    tvTop.setLayoutParams(tvTopLP);

    circleView.addView(tvTop);

    View divider = new View(this);
    divider.setBackgroundColor(Color.GRAY);
    RelativeLayout.LayoutParams dividerLP = new RelativeLayout.LayoutParams(screenHeight / 3 / 10 * 9, 3);
    dividerLP.addRule(RelativeLayout.CENTER_IN_PARENT);
    divider.setLayoutParams(dividerLP);

    circleView.addView(divider);

    TextView tvBottom = new TextView(this);
    tvBottom.setText("Bottom");
    tvBottom.setTextSize(50);
    RelativeLayout.LayoutParams tvBottomLP = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
    tvBottomLP.addRule(RelativeLayout.ALIGN_PARENT_TOP); // when set to ALIGN_PARENT_TOP, the layout will break
    tvBottomLP.addRule(RelativeLayout.CENTER_HORIZONTAL);
    tvBottomLP.topMargin = screenHeight / 3 / 5 * 3;
    tvBottom.setLayoutParams(tvBottomLP);

    circleView.addView(tvBottom);

    getSupportActionBar().hide();
  }
}

TextView textView = new TextView(this);

String string = "Some String";

// to make it bold (or other styling)
SpannableString spanString = new SpannableString(string);
spanString.setSpan(new StyleSpan(Typeface.BOLD), 0, spanString.length(), 0);

// to allow autosize of texts
textView.setAutoSizeTextTypeWithDefaults(TextView.AUTO_SIZE_TEXT_TYPE_UNIFORM);

textView.setText(spanString);
textView.setTextColor(Color.BLUE);

Typeface appFont = getResources().getFont(R.font.oswald); // oswald
textView.setTypeface(appFont);

// centering texts
textView.setGravity(Gravity.CENTER);

// padding
textView.setPadding(10, 10, 10, 10);

// minimum width and hight
textView.setMinimumWidth(20);
textView.setMinimumHeight(20);

fontをAndroid Studioに追加するには

resフォルダ内にfontフォルダを作り、その中に.ttfファイルを置く

Typeface appFont = getResources().getFont(R.font.oswald);

// app launch
onCreate called
onStart called
onResume called

// app screen rotated
onResume called
onStop called
onDestroy called
onCreate called
onStart called
onResume called

// app rotated again
onResume called
onStop called
onDestroy called
onCreate called
onStart called
onResume called

public class MainActivity extends AppCompatActivity {
  Button button;
  LinearLayout layout;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    layout = new LinearLayout(this);
    layout.setGravity(Gravity.CENTER);
    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);

    layout.setLayoutParams(params);

    button = new Button(this);
    button.setOnClickListener(new OnButtonClicked());
    layout.addView(button);
    setContentView(layout);
  }

  private class OnButtonClicked implements View.OnClickListener {
    @Override
    public void onClick(View v) {
      layout.setBackgroundColor(Color.RED);
      ColorDrawable[] colors = {new ColorDrawable(Color.RED), new ColorDrawable(Color.WHITE)};
      TransitionDrawable transition = new TransitionDrawable(colors);
      layout.setBackground(transition);
      transition.startTransition(2000);
      Log.d("MyTest", "clicked");
    }
  }
}

Title Barを消すにはres -> values -> themes -> themes.xml 内の下記を変更する

<style name="Theme.MidiPractice" parent="Theme.MaterialComponents.DayNight.NoActionBar">

もしくは、ActivityのonCreate()で以下を実行する

getSupportActionBar().hide();

StatusBarの色を変更するには res -> values -> themes -> themes.xml 内の下記を変更する

<item name="android:statusBarColor" tools:targetApi="l">@color/purple_200</item>

StatusBarのBackgroundColorを白にする場合は以下のように変更

<item name="android:statusBarColor" tools:targetApi="l">@color/white</item>
<item name="android:windowLightStatusBar">true</item>

private int getScreenWidth() {
  return Resources.getSystem().getDisplayMetrics().widthPixels;
}

private int getScreenHeight() {
  return Resources.getSystem().getDisplayMetrics().heightPixels;
}

JavaでString型の値を比べるときは == 演算子ではなく、equals()関数を使います。

"blog.kobito.something" == "blog.kobito.something // this returns false

new String("blog.kobito.something").equals("blog.kobito.something") // this returns true

// ... but they are not the same object
new String("test") == "test" // --> false 

// ... neither are these
new String("test") == new String("test") // --> false