com.bumptech.glide.load.resource.drawable.DrawableDecoderCompat Maven / Gradle / Ivy

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A fast and efficient image loading library for Android focused on smooth scrolling.

There is a newer version: 5.0.0-rc01

package com.bumptech.glide.load.resource.drawable;

import android.content.Context;
import android.content.res.Resources;
import android.content.res.Resources.Theme;
import android.graphics.drawable.Drawable;
import androidx.annotation.DrawableRes;
import androidx.annotation.Nullable;
import androidx.appcompat.content.res.AppCompatResources;
import androidx.appcompat.view.ContextThemeWrapper;
import androidx.core.content.ContextCompat;
import androidx.core.content.res.ResourcesCompat;

/**
 * Handles decoding Drawables with the v7 support library if present and falling back to the v4
 * support library otherwise.
 */
public final class DrawableDecoderCompat {
  private static volatile boolean shouldCallAppCompatResources = true;

  private DrawableDecoderCompat() {
    // Utility class.
  }

  /** See {@code getDrawable(Context, int, Theme)}. */
  public static Drawable getDrawable(
      Context ourContext, Context targetContext, @DrawableRes int id) {
    return getDrawable(ourContext, targetContext, id, /*theme=*/ null);
  }

  /**
   * Loads a Drawable using {@link AppCompatResources} if available and {@link ResourcesCompat}
   * otherwise, depending on whether or not the v7 support library is included in the application.
   *
   * @param theme Used instead of the {@link Theme} returned from the given {@link Context} if
   *     non-null when loading the {@link Drawable}.
   */
  public static Drawable getDrawable(
      Context ourContext, @DrawableRes int id, @Nullable Theme theme) {
    return getDrawable(ourContext, ourContext, id, theme);
  }

  private static Drawable getDrawable(
      Context ourContext, Context targetContext, @DrawableRes int id, @Nullable Theme theme) {
    try {
      // Race conditions may cause us to attempt to load using v7 more than once. That's ok since
      // this check is a modest optimization and the output will be correct anyway.
      if (shouldCallAppCompatResources) {
        return loadDrawableV7(targetContext, id, theme);
      }
    } catch (NoClassDefFoundError error) {
      shouldCallAppCompatResources = false;
    } catch (IllegalStateException e) {
      if (ourContext.getPackageName().equals(targetContext.getPackageName())) {
        throw e;
      }
      return ContextCompat.getDrawable(targetContext, id);
    } catch (Resources.NotFoundException e) {
      // Ignored, this can be thrown when drawable compat attempts to decode a canary resource. If
      // that decode attempt fails, we still want to try with the v4 ResourcesCompat below.
    }

    return loadDrawableV4(targetContext, id, theme != null ? theme : targetContext.getTheme());
  }

  private static Drawable loadDrawableV7(
      Context context, @DrawableRes int id, @Nullable Theme theme) {
    Context resourceContext = theme != null ? new ContextThemeWrapper(context, theme) : context;
    return AppCompatResources.getDrawable(resourceContext, id);
  }

  private static Drawable loadDrawableV4(
      Context context, @DrawableRes int id, @Nullable Theme theme) {
    Resources resources = context.getResources();
    return ResourcesCompat.getDrawable(resources, id, theme);
  }
}