GifViewUtils.java

package pl.droidsonroids.gif;

import android.content.res.Resources;
import android.content.res.TypedArray;
import android.net.Uri;
import android.os.Build;
import android.support.annotation.DrawableRes;
import android.support.annotation.NonNull;
import android.support.annotation.RawRes;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.View;
import android.widget.ImageView;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;

import me.xiaopan.sketch.gif.R;

final class GifViewUtils {
	static final String ANDROID_NS = "http://schemas.android.com/apk/res/android";
	static final List<String> SUPPORTED_RESOURCE_TYPE_NAMES = Arrays.asList("raw", "drawable", "mipmap");

	private GifViewUtils() {
	}

	static InitResult initImageView(ImageView view, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
		if (attrs != null && !view.isInEditMode()) {
			final int sourceResId = getResourceId(view, attrs, true);
			final int backgroundResId = getResourceId(view, attrs, false);
			final boolean freezesAnimation = isFreezingAnimation(view, attrs, defStyleAttr, defStyleRes);
			return new InitResult(sourceResId, backgroundResId, freezesAnimation);
		}
		return new InitResult(0, 0, false);
	}

	private static int getResourceId(ImageView view, AttributeSet attrs, final boolean isSrc) {
		final int resId = attrs.getAttributeResourceValue(ANDROID_NS, isSrc ? "src" : "background", 0);
		if (resId > 0) {
			final String resourceTypeName = view.getResources().getResourceTypeName(resId);
			if (SUPPORTED_RESOURCE_TYPE_NAMES.contains(resourceTypeName) && !setResource(view, isSrc, resId)) {
				return resId;
			}
		}
		return 0;
	}

	@SuppressWarnings("deprecation")
	static boolean setResource(ImageView view, boolean isSrc, int resId) {
		Resources res = view.getResources();
		if (res != null) {
			try {
				GifDrawable d = new GifDrawable(res, resId);
				if (isSrc) {
					view.setImageDrawable(d);
				} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
					view.setBackground(d);
				} else {
					view.setBackgroundDrawable(d);
				}
				return true;
			} catch (IOException | Resources.NotFoundException ignored) {
				//ignored
			}
		}
		return false;
	}

	static boolean isFreezingAnimation(View view, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
		final TypedArray gifViewAttributes = view.getContext().obtainStyledAttributes(attrs, R.styleable.GifView, defStyleAttr, defStyleRes);
		boolean freezesAnimation = gifViewAttributes.getBoolean(R.styleable.GifView_freezesAnimation, false);
		gifViewAttributes.recycle();
		return freezesAnimation;
	}

	static boolean setGifImageUri(ImageView imageView, Uri uri) {
		if (uri != null) {
			try {
				imageView.setImageDrawable(new GifDrawable(imageView.getContext().getContentResolver(), uri));
				return true;
			} catch (IOException ignored) {
				//ignored
			}
		}
		return false;
	}

	static float getDensityScale(@NonNull Resources res, @DrawableRes @RawRes int id) {
		final TypedValue value = new TypedValue();
		res.getValue(id, value, true);
		final int resourceDensity = value.density;
		final int density;
		if (resourceDensity == TypedValue.DENSITY_DEFAULT) {
			density = DisplayMetrics.DENSITY_DEFAULT;
		} else if (resourceDensity != TypedValue.DENSITY_NONE) {
			density = resourceDensity;
		} else {
			density = 0;
		}
		final int targetDensity = res.getDisplayMetrics().densityDpi;

		if (density > 0 && targetDensity > 0) {
			return (float) targetDensity / density;
		}
		return 1f;
	}

	static class InitResult {
		final int mSourceResId;
		final int mBackgroundResId;
		final boolean mFreezesAnimation;

		InitResult(int sourceResId, int backgroundResId, boolean freezesAnimation) {

			mSourceResId = sourceResId;
			mBackgroundResId = backgroundResId;
			mFreezesAnimation = freezesAnimation;
		}
	}
}