我正在尝试使用双指缩放手势缩放TextView。我有捏缩放工作,但随着文本缩放它变得有点像素化。我认为这是因为实际的字体大小没有缩放。但是,当我尝试将setTextSize()置于onTouch()方法的任何位置时,它会在TextView边缘出现/消失的小线条上变得非常不连贯,并且当缩放比例足够大时文本会消失。我在LinearLayout中有TextView,而缩放缩放会缩放LinearLayout。
这是布局xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF000000" >
<LinearLayout
android:id="@+id/textLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="top"
android:text="texthere" />
</LinearLayout>
<View
android:id="@+id/touchView"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</FrameLayout>
这是触控侦听器java:
scaleView.setOnTouchListener(new View.OnTouchListener(){
public boolean onTouch(View v, MotionEvent event){
float viewWidth = mTextView.getWidth();
float viewHeight = mTextView.getHeight();
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
mode = DRAG;
x_0 = mTextView.getX();//+50;
y_0 = mTextiew.getY();//+50;
initialTouchRawX = event.getRawX();
initialTouchRawY = event.getRawY();
currentScale = mTextView.getScaleX();
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist2 = spacing(event);
if (oldDist2 > 10f) {
mode = ZOOM;
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
break;
case MotionEvent.ACTION_MOVE:
float xmin = x_0 - viewWidth/2*(currentScale-1);
float xmax = x_0 + viewWidth + viewWidth/2*(currentScale-1);
float ymin = y_0 - viewHeight/2*(currentScale-1) + viewShift;
float ymax = y_0 + viewHeight + viewHeight/2*(currentScale-1) + viewShift;
if (mode == DRAG && initialTouchRawX >= xmin && initialTouchRawX <= xmax && initialTouchRawY >= ymin && initialTouchRawY <= ymax ) {
float mShiftX = -(initialTouchRawX - x_0);
float mShiftY = -(initialTouchRawY - y_0);
mTextView.setX((float) event.getRawX()+mShiftX);
mTextView.setY((float) event.getRawY()+mShiftY);
} else if (mode == ZOOM) {
float newDist2 = spacing(event);
if (newDist2 > 10f) {
newScale = newDist2 / oldDist2 * currentScale;
mTextView.setScaleX(newScale);
mTextView.setScaleY(newScale);
//***I've tried setting the font size here***
}
}
break;
}
//***I've tried setting the font size here***
//*** Now I write the scaling float to shared preferences here
return true;
}
});
我对实际缩放字体大小的位置和方式感到困惑。我已在代码中指出我尝试实现setFontSize()。我的意思是,它确实起作用了,但是就像我上面提到的那样,它的质量很差,文字消失了,而且有时会出现在TextView的边缘。任何提示都非常感谢。
===编辑:===
我在下面实现了一个自定义TextView:
public class ScaleTextView extends TextView {
public ScaleTextView(Context context) {
this(context, null);
}
public ScaleTextView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ScaleTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
updateTextSize(context);
}
public void updateTextSize(Context context) {
getTypeface();
float currentTextSize = getTextSize();
SharedPreferences otherSettings = context.getSharedPreferences("settings", 0);
float newScale = otherSettings.getFloat("key_scaling", 1f);
setTextSize(newScale * currentTextSize);
}
}
所以这有点帮助,除了肖像和横向的字体大小现在不同,这导致每次方向改变时缩放。一旦比例足够大,文本仍然会消失,有时文本视图的边缘会有行。也许有更好的方法将缩放变量传递给自定义的ScaleTextView类?