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Add standalone IconResizer, derived from LauncherActivity.IconResizer.

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Oasis 2016-02-24 22:59:19 +08:00
parent a01fb8a927
commit 220430526b
1 changed files with 107 additions and 0 deletions
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library/src/main/java/com/oasisfeng/android/ui/IconResizer.java Normal file
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package com.oasisfeng.android.ui;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.PaintDrawable;
/**
* Utility class to resize icons to match default icon size.
*
* Derived from {@link android.app.LauncherActivity.IconResizer}
*/
public class IconResizer {
// Code is borrowed from com.android.launcher.Utilities.
private int mIconWidth = -1;
private int mIconHeight = -1;
private final Rect mOldBounds = new Rect();
private final Canvas mCanvas = new Canvas();
public IconResizer() {
mCanvas.setDrawFilter(new PaintFlagsDrawFilter(Paint.DITHER_FLAG,
Paint.FILTER_BITMAP_FLAG));
final Resources resources = Resources.getSystem();
mIconWidth = mIconHeight = (int) resources.getDimension(
android.R.dimen.app_icon_size);
}
/**
* Returns a Drawable representing the thumbnail of the specified Drawable.
* The size of the thumbnail is defined by the dimension
* android.R.dimen.launcher_application_icon_size.
*
* This method is not thread-safe and should be invoked on the UI thread only.
*
* @param icon The icon to get a thumbnail of.
*
* @return A thumbnail for the specified icon or the icon itself if the
* thumbnail could not be created.
*/
public Drawable createIconThumbnail(Drawable icon) {
int width = mIconWidth;
int height = mIconHeight;
final int iconWidth = icon.getIntrinsicWidth();
final int iconHeight = icon.getIntrinsicHeight();
if (icon instanceof PaintDrawable) {
final PaintDrawable painter = (PaintDrawable) icon;
painter.setIntrinsicWidth(width);
painter.setIntrinsicHeight(height);
}
if (width > 0 && height > 0) {
if (width < iconWidth || height < iconHeight) {
final float ratio = (float) iconWidth / iconHeight;
if (iconWidth > iconHeight) {
height = (int) (width / ratio);
} else if (iconHeight > iconWidth) {
width = (int) (height * ratio);
}
final Bitmap.Config c = icon.getOpacity() != PixelFormat.OPAQUE ?
Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
final Bitmap thumb = Bitmap.createBitmap(mIconWidth, mIconHeight, c);
final Canvas canvas = mCanvas;
canvas.setBitmap(thumb);
// Copy the old bounds to restore them later
// If we were to do oldBounds = icon.getBounds(),
// the call to setBounds() that follows would
// change the same instance and we would lose the
// old bounds
mOldBounds.set(icon.getBounds());
final int x = (mIconWidth - width) / 2;
final int y = (mIconHeight - height) / 2;
icon.setBounds(x, y, x + width, y + height);
icon.draw(canvas);
icon.setBounds(mOldBounds);
icon = new BitmapDrawable(Resources.getSystem(), thumb);
canvas.setBitmap(null);
} else if (iconWidth < width && iconHeight < height) {
final Bitmap.Config c = Bitmap.Config.ARGB_8888;
final Bitmap thumb = Bitmap.createBitmap(mIconWidth, mIconHeight, c);
final Canvas canvas = mCanvas;
canvas.setBitmap(thumb);
mOldBounds.set(icon.getBounds());
final int x = (width - iconWidth) / 2;
final int y = (height - iconHeight) / 2;
icon.setBounds(x, y, x + iconWidth, y + iconHeight);
icon.draw(canvas);
icon.setBounds(mOldBounds);
icon = new BitmapDrawable(Resources.getSystem(), thumb);
canvas.setBitmap(null);
}
}
return icon;
}
}