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| import android.content.Context ;
import androidx.annotation.NonNull;
import android.util.AttributeSet ;
import android.util.Log ;
import android.util.TypedValue ;
import android.view.MotionEvent ;
import android.view.ScaleGestureDetector ;
import android.widget.TextView;
public class ZoomTextView extends androidx.appcompat.widget.AppCompatTextView {
private static final String TAG = "ZoomTextView";
private ScaleGestureDetector mScaleDetector;
private float mScaleFactor = 1.f;
private float defaultSize;
private float zoomLimit = 3.0f;
public ZoomTextView(Context context) {
super(context);
initialize();
}
public ZoomTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initialize();
}
public ZoomTextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initialize();
}
private void initialize() {
defaultSize = getTextSize();
mScaleDetector = new ScaleGestureDetector(getContext(), new ScaleListener());
}
public void setZoomLimit(float zoomLimit) {
this.zoomLimit = zoomLimit;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
public boolean onTouchEvent(@NonNull MotionEvent ev) {
super.onTouchEvent(ev);
mScaleDetector.onTouchEvent(ev);
return true;
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
mScaleFactor *= detector.getScaleFactor();
mScaleFactor = Math.max(1.0f, Math.min(mScaleFactor, zoomLimit));
setTextSize(TypedValue.COMPLEX_UNIT_PX, defaultSize * mScaleFactor);
Log.e(TAG, String.valueOf(mScaleFactor));
return true;
}
}
} |
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