android.content.pm.ActivityInfo#activityInfoConfigNativeToJava()源码实例Demo

/**
 * Retrieves the string value associated with a particular resource
 * identifier for the current configuration.
 *
 * @param resId the resource identifier to load
 * @param bagEntryId
 * @return the string value, or {@code null}
 */
@Nullable
final CharSequence getResourceBagText(@StringRes int resId, int bagEntryId) {
    synchronized (this) {
        final TypedValue outValue = mValue;
        final int block = loadResourceBagValue(resId, bagEntryId, outValue, true);
        if (block < 0) {
            return null;
        }

        // Convert the changing configurations flags populated by native code.
        outValue.changingConfigurations = ActivityInfo.activityInfoConfigNativeToJava(
                outValue.changingConfigurations);

        if (outValue.type == TypedValue.TYPE_STRING) {
            return mStringBlocks[block].get(outValue.data);
        }
        return outValue.coerceToString();
    }
}
 

/**
 * Populates {@code outValue} with the data associated a particular
 * resource identifier for the current configuration.
 *
 * @param resId the resource identifier to load
 * @param densityDpi the density bucket for which to load the resource
 * @param outValue the typed value in which to put the data
 * @param resolveRefs {@code true} to resolve references, {@code false}
 *                    to leave them unresolved
 * @return {@code true} if the data was loaded into {@code outValue},
 *         {@code false} otherwise
 */
final boolean getResourceValue(@AnyRes int resId, int densityDpi, @NonNull TypedValue outValue,
        boolean resolveRefs) {
    synchronized (this) {
        final int block = loadResourceValue(resId, (short) densityDpi, outValue, resolveRefs);
        if (block < 0) {
            return false;
        }

        // Convert the changing configurations flags populated by native code.
        outValue.changingConfigurations = ActivityInfo.activityInfoConfigNativeToJava(
                outValue.changingConfigurations);

        if (outValue.type == TypedValue.TYPE_STRING) {
            outValue.string = mStringBlocks[block].get(outValue.data);
        }
        return true;
    }
}
 

/**
 * Populates {@code outValue} with the data associated with a particular
 * resource identifier for the current configuration. Resolves theme
 * attributes against the specified theme.
 *
 * @param theme the native pointer of the theme
 * @param resId the resource identifier to load
 * @param outValue the typed value in which to put the data
 * @param resolveRefs {@code true} to resolve references, {@code false}
 *                    to leave them unresolved
 * @return {@code true} if the data was loaded into {@code outValue},
 *         {@code false} otherwise
 */
final boolean getThemeValue(long theme, @AnyRes int resId, @NonNull TypedValue outValue,
        boolean resolveRefs) {
    final int block = loadThemeAttributeValue(theme, resId, outValue, resolveRefs);
    if (block < 0) {
        return false;
    }

    // Convert the changing configurations flags populated by native code.
    outValue.changingConfigurations = ActivityInfo.activityInfoConfigNativeToJava(
            outValue.changingConfigurations);

    if (outValue.type == TypedValue.TYPE_STRING) {
        final StringBlock[] blocks = ensureStringBlocks();
        outValue.string = blocks[block].get(outValue.data);
    }
    return true;
}
 

/**
 * Return a mask of the configuration parameters for which the values in
 * this typed array may change.
 *
 * @return Returns a mask of the changing configuration parameters, as
 *         defined by {@link android.content.pm.ActivityInfo}.
 * @throws RuntimeException if the TypedArray has already been recycled.
 * @see android.content.pm.ActivityInfo
 */
public @Config int getChangingConfigurations() {
    if (mRecycled) {
        throw new RuntimeException("Cannot make calls to a recycled instance!");
    }

    @Config int changingConfig = 0;

    final int[] data = mData;
    final int N = length();
    for (int i = 0; i < N; i++) {
        final int index = i * STYLE_NUM_ENTRIES;
        final int type = data[index + STYLE_TYPE];
        if (type == TypedValue.TYPE_NULL) {
            continue;
        }
        changingConfig |= ActivityInfo.activityInfoConfigNativeToJava(
                data[index + STYLE_CHANGING_CONFIGURATIONS]);
    }
    return changingConfig;
}
 

private boolean getValueAt(int index, TypedValue outValue) {
    final int[] data = mData;
    final int type = data[index + STYLE_TYPE];
    if (type == TypedValue.TYPE_NULL) {
        return false;
    }
    outValue.type = type;
    outValue.data = data[index + STYLE_DATA];
    outValue.assetCookie = data[index + STYLE_ASSET_COOKIE];
    outValue.resourceId = data[index + STYLE_RESOURCE_ID];
    outValue.changingConfigurations = ActivityInfo.activityInfoConfigNativeToJava(
            data[index + STYLE_CHANGING_CONFIGURATIONS]);
    outValue.density = data[index + STYLE_DENSITY];
    outValue.string = (type == TypedValue.TYPE_STRING) ? loadStringValueAt(index) : null;
    return true;
}
 

/**
 * Populates {@code outValue} with the data associated a particular
 * resource identifier for the current configuration.
 *
 * @param resId the resource identifier to load
 * @param densityDpi the density bucket for which to load the resource
 * @param outValue the typed value in which to put the data
 * @param resolveRefs {@code true} to resolve references, {@code false}
 *                    to leave them unresolved
 * @return {@code true} if the data was loaded into {@code outValue},
 *         {@code false} otherwise
 */
boolean getResourceValue(@AnyRes int resId, int densityDpi, @NonNull TypedValue outValue,
        boolean resolveRefs) {
    Preconditions.checkNotNull(outValue, "outValue");
    synchronized (this) {
        ensureValidLocked();
        final int cookie = nativeGetResourceValue(
                mObject, resId, (short) densityDpi, outValue, resolveRefs);
        if (cookie <= 0) {
            return false;
        }

        // Convert the changing configurations flags populated by native code.
        outValue.changingConfigurations = ActivityInfo.activityInfoConfigNativeToJava(
                outValue.changingConfigurations);

        if (outValue.type == TypedValue.TYPE_STRING) {
            outValue.string = mApkAssets[cookie - 1].getStringFromPool(outValue.data);
        }
        return true;
    }
}
 

/**
 * Retrieves the string value associated with a particular resource
 * identifier for the current configuration.
 *
 * @param resId the resource identifier to load
 * @param bagEntryId the index into the bag to load
 * @return the string value, or {@code null}
 */
@Nullable CharSequence getResourceBagText(@StringRes int resId, int bagEntryId) {
    synchronized (this) {
        ensureValidLocked();
        final TypedValue outValue = mValue;
        final int cookie = nativeGetResourceBagValue(mObject, resId, bagEntryId, outValue);
        if (cookie <= 0) {
            return null;
        }

        // Convert the changing configurations flags populated by native code.
        outValue.changingConfigurations = ActivityInfo.activityInfoConfigNativeToJava(
                outValue.changingConfigurations);

        if (outValue.type == TypedValue.TYPE_STRING) {
            return mApkAssets[cookie - 1].getStringFromPool(outValue.data);
        }
        return outValue.coerceToString();
    }
}
 

/**
 * Populates {@code outValue} with the data associated with a particular
 * resource identifier for the current configuration. Resolves theme
 * attributes against the specified theme.
 *
 * @param theme the native pointer of the theme
 * @param resId the resource identifier to load
 * @param outValue the typed value in which to put the data
 * @param resolveRefs {@code true} to resolve references, {@code false}
 *                    to leave them unresolved
 * @return {@code true} if the data was loaded into {@code outValue},
 *         {@code false} otherwise
 */
boolean getThemeValue(long theme, @AnyRes int resId, @NonNull TypedValue outValue,
        boolean resolveRefs) {
    Preconditions.checkNotNull(outValue, "outValue");
    synchronized (this) {
        ensureValidLocked();
        final int cookie = nativeThemeGetAttributeValue(mObject, theme, resId, outValue,
                resolveRefs);
        if (cookie <= 0) {
            return false;
        }

        // Convert the changing configurations flags populated by native code.
        outValue.changingConfigurations = ActivityInfo.activityInfoConfigNativeToJava(
                outValue.changingConfigurations);

        if (outValue.type == TypedValue.TYPE_STRING) {
            outValue.string = mApkAssets[cookie - 1].getStringFromPool(outValue.data);
        }
        return true;
    }
}
 

/**
 * Retrieves the string value for the attribute at <var>index</var> that is
 * not allowed to change with the given configurations.
 *
 * @param index Index of attribute to retrieve.
 * @param allowedChangingConfigs Bit mask of configurations from
 *        {@link Configuration}.NATIVE_CONFIG_* that are allowed to change.
 *
 * @return String holding string data. Any styling information is removed.
 *         Returns {@code null} if the attribute is not defined.
 * @throws RuntimeException if the TypedArray has already been recycled.
 * @hide
 */
public String getNonConfigurationString(@StyleableRes int index,
        @Config int allowedChangingConfigs) {
    if (mRecycled) {
        throw new RuntimeException("Cannot make calls to a recycled instance!");
    }

    index *= STYLE_NUM_ENTRIES;
    final int[] data = mData;
    final int type = data[index + STYLE_TYPE];
    final @Config int changingConfigs = ActivityInfo.activityInfoConfigNativeToJava(
            data[index + STYLE_CHANGING_CONFIGURATIONS]);
    if ((changingConfigs & ~allowedChangingConfigs) != 0) {
        return null;
    }
    if (type == TypedValue.TYPE_NULL) {
        return null;
    } else if (type == TypedValue.TYPE_STRING) {
        return loadStringValueAt(index).toString();
    }

    final TypedValue v = mValue;
    if (getValueAt(index, v)) {
        final CharSequence cs = v.coerceToString();
        return cs != null ? cs.toString() : null;
    }

    // We already checked for TYPE_NULL. This should never happen.
    throw new RuntimeException("getNonConfigurationString of bad type: 0x"
            + Integer.toHexString(type));
}
 

@Config int getChangingConfigurations() {
    synchronized (mKey) {
        final @NativeConfig int nativeChangingConfig =
                AssetManager.nativeThemeGetChangingConfigurations(mTheme);
        return ActivityInfo.activityInfoConfigNativeToJava(nativeChangingConfig);
    }
}