Android プログラミング 基本API

雑なメモ

public class StringView extends View implements
        GestureDetector.OnGestureListener,
        GestureDetector.OnDoubleTapListener{

    private ArrayList<String>info;
    private GestureDetector gestureDetector;

    private Bitmap image;
    private int keyCode = -999;
    private HashMap<String,PointF> points = new HashMap<String,PointF>();


    public StringView(Context context) {
        super(context);
        setBackgroundColor(Color.WHITE);

//        ジェスチャーディテクターの生成
        info = new ArrayList<String>();
        info.add("GESTURE>");
        gestureDetector = new GestureDetector(context,this);

        Resources resources = context.getResources();
        image = BitmapFactory.decodeResource(resources, R.mipmap.ic_launcher);
        setFocusable(true); // 方向キーやプログラムでフォーカスを移すことができるかどうか指定
        setFocusableInTouchMode(true); // タッチモードの時にフォーカスを移すことができるかどうかの指定
    }

    @Override
    protected void onDraw(Canvas canvas) {
        Paint paint = new Paint();
        paint.setTextSize(48);
        canvas.drawText("横: " + getWidth(), 0, 100, paint);
        canvas.drawText("縦: " + getHeight(), 0, 200, paint);

//        canvas.drawBitmap(image,500,500,null);

        String str = "";
        if(keyCode == KeyEvent.KEYCODE_DPAD_UP) str = "DPAD_UP";
        if(keyCode == KeyEvent.KEYCODE_DPAD_DOWN) str = "DPAD_DOWN";
        if(keyCode == KeyEvent.KEYCODE_DPAD_LEFT) str = "DPAD_LEFT";
        if(keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) str = "DPAD_RIGHT";
        if(keyCode == KeyEvent.KEYCODE_BACK) str = "BACK";
        if(keyCode == KeyEvent.KEYCODE_MENU) str = "MENU";
        canvas.drawText("KeyCode: " + str, 0, 400, paint);

//        canvas.drawText("Touch: ",0,600,paint);
//        タッチXY座標の描画
        Object[] keys = points.keySet().toArray();
        for (int i=0;i<keys.length;i++){
            PointF pos = (PointF)points.get(keys[i]);
            canvas.drawText((int)pos.x+","+(int)pos.y,0,700+48*i,paint);
        }

//        情報の描画
        for (int i=0;i<info.size();i++){
            canvas.drawText((String)info.get(i),300,800+48*i,paint);
        }

    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
//        アクション種別とタッチ獲得
        int action =event.getAction();
        int count = event.getPointerCount();

//        アクションインデックスとポインタIDの獲得
        int index = event.getActionIndex();
        int pointerID = event.getPointerId(index);

//        タッチ位置の取得
        switch(action&MotionEvent.ACTION_MASK){
            case MotionEvent.ACTION_DOWN: //指が1本の時
            case MotionEvent.ACTION_POINTER_DOWN: //指が2本目以降の時
                points.put(""+pointerID,new PointF(event.getX(),event.getY()));
                break;
            case MotionEvent.ACTION_MOVE:
                for(int i=0;i<count;i++){
                    PointF pos = points.get(""+event.getPointerId(i));
                    pos.x = event.getX(i);
                    pos.y = event.getY(i);
                }
                break;
            case MotionEvent.ACTION_UP: //指が1本目の時
            case MotionEvent.ACTION_POINTER_UP: //指が2本目以降の時
            case MotionEvent.ACTION_CANCEL:
                points.remove(""+pointerID);
                break;
        }
        gestureDetector.onTouchEvent(event);
        invalidate();
        return true;
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        this.keyCode = keyCode;

//        画面の再描画
        invalidate();
        return true;
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        this.keyCode = -999;

        invalidate();
        return true;
    }

//    情報の追加
    private  void addInfo(String str){
        info.add(1,str);
        while(info.size() > 30) info.remove(info.size()-1);
        invalidate();
    }

//    ダウン時
    @Override
    public boolean onDown(MotionEvent e) {
        addInfo("Down");
        return false;
    }
//  プレス後ムーブなし
    @Override
    public void onShowPress(MotionEvent e) {
        addInfo("ShowPress");
    }
//  アップ時
    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        addInfo("Up");
        return false;
    }

//    長押し時
    @Override
    public void onLongPress(MotionEvent e) {
        addInfo("LongPress");
    }
//  フリック時
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        addInfo("Fling("+(int)velocityX+","+(int)velocityY+")");
        return false;
    }
//  スクロール時
    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        addInfo("SCroll("+(int)distanceX+","+(int)distanceY+")");
        return false;
    }
//  シングルタップ時
    @Override
    public boolean onSingleTapConfirmed(MotionEvent e) {
        addInfo("SingleTap");
        return false;
    }
//  ダブルタップ時
    @Override
    public boolean onDoubleTap(MotionEvent e) {
        addInfo("DoubleTap");
        return false;
    }
//  ダブルタップイベント時
    @Override
    public boolean onDoubleTapEvent(MotionEvent e) {
        addInfo("DoubleTapEvent");
        return false;
    }
}

参考文献

Androidプログラミングバイブル SDK5/4対応 (smart phone programming bible)