Android Studioサンプルアプリ解説集 - RGB値により色を作るColorMaker

xml > res/drawable/bgred.xml

  1: <?xml version="1.0" encoding="utf-8"?>
  2: <shape xmlns:android="http://schemas.android.com/apk/res/android">
  3:    <gradient
  4:            android:startColor="#FF0000"
  5:            android:endColor="#000000"
  6:            android:angle="270"
  7:    />
  8: </shape>

xml > res/drawable/bggreen.xml

  1: <?xml version="1.0" encoding="utf-8"?>
  2: <shape xmlns:android="http://schemas.android.com/apk/res/android">
  3:    <gradient
  4:            android:startColor="#00FF00"
  5:            android:endColor="#000000"
  6:            android:angle="270"
  7:    />
  8: </shape>

xml > res/drawable/bgblue.xml

  1: <?xml version="1.0" encoding="utf-8"?>
  2: <shape xmlns:android="http://schemas.android.com/apk/res/android">
  3:    <gradient
  4:            android:startColor="#0000FF"
  5:            android:endColor="#000000"
  6:            android:angle="270"
  7:    />
  8: </shape>

Java > java/com.example.sample.colormaker/MainActivity.java

  1: package com.example.sample.colormaker;
  2:
  3: import android.graphics.Color;
  4: import android.support.v7.app.ActionBarActivity;
  5: import android.os.Bundle;
  6: import android.view.KeyEvent;
  7: import android.view.Menu;
  8: import android.view.MenuItem;
  9: import android.view.View;
 10: import android.widget.EditText;
 11: import android.widget.SeekBar;
 12: import android.widget.TextView;
 13: import android.widget.Toast;
 14:
 15:
 16: public class MainActivity extends ActionBarActivity implements TextView.OnEditorActionListener, View.OnFocusChangeListener, SeekBar.OnSeekBarChangeListener {
 17:     TextView txtColor;    // 色見本を表示するためのテキストビュー
 18:     EditText edtRed, edtGreen, edtBlue;        // カラーコードを入力するためのエディットテキスト
 19:     SeekBar sbrRed, sbrGreen, sbrBlue;        // シークバー
 20:
 21:     @Override
 22:     protected void onCreate(Bundle savedInstanceState) {
 23:         super.onCreate(savedInstanceState);
 24:         setContentView(R.layout.activity_main);
 25:         // リソースからビューを取得する
 26:         txtColor = (TextView) this.findViewById(R.id.txtColor);
 27:         edtRed = (EditText) this.findViewById(R.id.edtRed);
 28:         edtGreen = (EditText) this.findViewById(R.id.edtGreen);
 29:         edtBlue = (EditText) this.findViewById(R.id.edtBlue);
 30:         sbrRed = (SeekBar) this.findViewById(R.id.sbrRed);
 31:         sbrGreen = (SeekBar) this.findViewById(R.id.sbrGreen);
 32:         sbrBlue = (SeekBar) this.findViewById(R.id.sbrBlue);
 33:         edtRed.setOnEditorActionListener(this);
 34:         edtGreen.setOnEditorActionListener(this);
 35:         edtBlue.setOnEditorActionListener(this);
 36:         edtRed.setOnFocusChangeListener(this);
 37:         edtGreen.setOnFocusChangeListener(this);
 38:         edtBlue.setOnFocusChangeListener(this);
 39:         sbrRed.setOnSeekBarChangeListener(this);
 40:         sbrGreen.setOnSeekBarChangeListener(this);
 41:         sbrBlue.setOnSeekBarChangeListener(this);
 42:     }
 43:
 44:     @Override
 45:     public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
 46:         try {
 47:             int value = Integer.parseInt(v.getText().toString());    // 数値に変換し
 48:             value = Math.max(0,Math.min(255,value));
 49:             switch (v.getId()) {
 50:                 case R.id.edtRed:
 51:                     sbrRed.setProgress(value);      // sbrRedの値を変える
 52:                     break;
 53:                 case R.id.edtGreen:
 54:                     sbrGreen.setProgress(value);    // sbrGreenの値を変える
 55:                     break;
 56:                 case R.id.edtBlue:
 57:                     sbrBlue.setProgress(value);     // sbrBlueの値を変える
 58:                     break;
 59:                 default:
 60:                     return false;
 61:             }
 62:             Change();
 63:         } catch (Exception e) {
 64:         }
 65:         return false;
 66:     }
 67:
 68:     @Override
 69:     public void onFocusChange(View v, boolean hasFocus) {
 70:         try {
 71:             int value = Integer.parseInt(((TextView)v).getText().toString());    // 数値に変換し
 72:             value = Math.max(0,Math.min(255,value));
 73:             switch (v.getId()) {
 74:                 case R.id.edtRed:
 75:                     sbrRed.setProgress(value);      // sbrRedの値を変える
 76:                     break;
 77:                 case R.id.edtGreen:
 78:                     sbrGreen.setProgress(value);    // sbrGreenの値を変える
 79:                     break;
 80:                 case R.id.edtBlue:
 81:                     sbrBlue.setProgress(value);     // sbrBlueの値を変える
 82:                     break;
 83:                 default:
 84:                     return;
 85:             }
 86:             Change();
 87:         } catch (Exception e) {
 88:         }
 89:     }
 90:
 91:     @Override
 92:     public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
 93:         switch (seekBar.getId()) {
 94:             case R.id.sbrRed:
 95:                 edtRed.setText(String.format("%1$d", progress));    // 値が変わったら、edtRedのテキストも変える
 96:                 break;
 97:             case R.id.sbrGreen:
 98:                 edtGreen.setText(String.format("%1$d", progress));  // 値が変わったら、edtGreenのテキストも変える
 99:                 break;
 98:             case R.id.sbrBlue:
 99:                 edtBlue.setText(String.format("%1$d", progress));   // 値が変わったら、edtBlueのテキストも変える
100:                 break;
101:             default:
102:                 return;
103:         }
104:         Change();
105:     }
106:
107:     @Override
108:     public void onStartTrackingTouch(SeekBar seekBar) {
109:         // 何もしない
110:     }
111:
112:     @Override
113:     public void onStopTrackingTouch(SeekBar seekBar) {
114:         // 何もしない
115:     }
116:
117:     private void Change() {
118:         try {
119:             int r, g, b;
120:             r = Integer.parseInt(edtRed.getText().toString());
121:             g = Integer.parseInt(edtGreen.getText().toString());
122:             b = Integer.parseInt(edtBlue.getText().toString());
123:             txtColor.setText(String.format("#%1$02X%2$02X%3$02X", r, g, b));
124:             txtColor.setBackgroundColor(Color.rgb(r, g, b));
125:         } catch (Exception ex) {
126:         }
127:     }
128:
        ：
151: }