我TextView使用本教程為我實現了一個縮放縮放。結果代碼是這樣的：private?GestureDetector?gestureDetector;private?View.OnTouchListener?gestureListener;

并在onCreate()中：//?Zoom?handlers

gestureDetector?=?new?GestureDetector(new?MyGestureDetector());

gestureListener?=?new?View.OnTouchListener()?{

//?We?can?be?in?one?of?these?2?states

static?final?int?NONE?=?0;

static?final?int?ZOOM?=?1;

int?mode?=?NONE;

static?final?int?MIN_FONT_SIZE?=?10;

static?final?int?MAX_FONT_SIZE?=?50;

float?oldDist?=?1f;

@Override

public?boolean?onTouch(View?v,?MotionEvent?event)?{

TextView?textView?=?(TextView)?findViewById(R.id.text);

switch?(event.getAction()?&?MotionEvent.ACTION_MASK)?{

case?MotionEvent.ACTION_POINTER_DOWN:

oldDist?=?spacing(event);

Log.d(TAG,?"oldDist="?+?oldDist);

if?(oldDist?>?10f)?{

mode?=?ZOOM;

Log.d(TAG,?"mode=ZOOM"?);

}

break;

case?MotionEvent.ACTION_POINTER_UP:

mode?=?NONE;

break;

case?MotionEvent.ACTION_MOVE:

if?(mode?==?ZOOM)?{

float?newDist?=?spacing(event);

//?If?you?want?to?tweak?font?scaling,?this?is?the?place?to?go.

if?(newDist?>?10f)?{

float?scale?=?newDist?/?oldDist;

if?(scale?>?1)?{

scale?=?1.1f;

}?else?if?(scale?

scale?=?0.95f;

}

float?currentSize?=?textView.getTextSize()?*?scale;

if?((currentSize??MIN_FONT_SIZE)

||(currentSize?>=?MAX_FONT_SIZE?&&?scale?

||?(currentSize?<=?MIN_FONT_SIZE?&&?scale?>?1))?{

textView.setTextSize(TypedValue.COMPLEX_UNIT_PX,?currentSize);

}

}

}

break;

}

return?false;

}

魔術常數1.1和0.95是根據經驗選擇的(scale為此目的使用變量使我的TextView行為有點奇怪)。

總結

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