| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.view; |
| |
| import android.annotation.StyleRes; |
| import android.annotation.UnsupportedAppUsage; |
| import android.content.Context; |
| import android.content.ContextWrapper; |
| import android.content.res.AssetManager; |
| import android.content.res.Configuration; |
| import android.content.res.Resources; |
| |
| /** |
| * A context wrapper that allows you to modify or replace the theme of the |
| * wrapped context. |
| */ |
| public class ContextThemeWrapper extends ContextWrapper { |
| @UnsupportedAppUsage |
| private int mThemeResource; |
| @UnsupportedAppUsage |
| private Resources.Theme mTheme; |
| @UnsupportedAppUsage |
| private LayoutInflater mInflater; |
| private Configuration mOverrideConfiguration; |
| @UnsupportedAppUsage |
| private Resources mResources; |
| |
| /** |
| * Creates a new context wrapper with no theme and no base context. |
| * <p class="note"> |
| * <strong>Note:</strong> A base context <strong>must</strong> be attached |
| * using {@link #attachBaseContext(Context)} before calling any other |
| * method on the newly constructed context wrapper. |
| */ |
| public ContextThemeWrapper() { |
| super(null); |
| } |
| |
| /** |
| * Creates a new context wrapper with the specified theme. |
| * <p> |
| * The specified theme will be applied on top of the base context's theme. |
| * Any attributes not explicitly defined in the theme identified by |
| * <var>themeResId</var> will retain their original values. |
| * |
| * @param base the base context |
| * @param themeResId the resource ID of the theme to be applied on top of |
| * the base context's theme |
| */ |
| public ContextThemeWrapper(Context base, @StyleRes int themeResId) { |
| super(base); |
| mThemeResource = themeResId; |
| } |
| |
| /** |
| * Creates a new context wrapper with the specified theme. |
| * <p> |
| * Unlike {@link #ContextThemeWrapper(Context, int)}, the theme passed to |
| * this constructor will completely replace the base context's theme. |
| * |
| * @param base the base context |
| * @param theme the theme against which resources should be inflated |
| */ |
| public ContextThemeWrapper(Context base, Resources.Theme theme) { |
| super(base); |
| mTheme = theme; |
| } |
| |
| @Override |
| protected void attachBaseContext(Context newBase) { |
| super.attachBaseContext(newBase); |
| } |
| |
| /** |
| * Call to set an "override configuration" on this context -- this is |
| * a configuration that replies one or more values of the standard |
| * configuration that is applied to the context. See |
| * {@link Context#createConfigurationContext(Configuration)} for more |
| * information. |
| * |
| * <p>This method can only be called once, and must be called before any |
| * calls to {@link #getResources()} or {@link #getAssets()} are made. |
| */ |
| public void applyOverrideConfiguration(Configuration overrideConfiguration) { |
| if (mResources != null) { |
| throw new IllegalStateException( |
| "getResources() or getAssets() has already been called"); |
| } |
| if (mOverrideConfiguration != null) { |
| throw new IllegalStateException("Override configuration has already been set"); |
| } |
| mOverrideConfiguration = new Configuration(overrideConfiguration); |
| } |
| |
| /** |
| * Used by ActivityThread to apply the overridden configuration to onConfigurationChange |
| * callbacks. |
| * @hide |
| */ |
| public Configuration getOverrideConfiguration() { |
| return mOverrideConfiguration; |
| } |
| |
| @Override |
| public AssetManager getAssets() { |
| // Ensure we're returning assets with the correct configuration. |
| return getResourcesInternal().getAssets(); |
| } |
| |
| @Override |
| public Resources getResources() { |
| return getResourcesInternal(); |
| } |
| |
| private Resources getResourcesInternal() { |
| if (mResources == null) { |
| if (mOverrideConfiguration == null) { |
| mResources = super.getResources(); |
| } else { |
| final Context resContext = createConfigurationContext(mOverrideConfiguration); |
| mResources = resContext.getResources(); |
| } |
| } |
| return mResources; |
| } |
| |
| @Override |
| public void setTheme(int resid) { |
| if (mThemeResource != resid) { |
| mThemeResource = resid; |
| initializeTheme(); |
| } |
| } |
| |
| /** @hide */ |
| @Override |
| @UnsupportedAppUsage |
| public int getThemeResId() { |
| return mThemeResource; |
| } |
| |
| @Override |
| public Resources.Theme getTheme() { |
| if (mTheme != null) { |
| return mTheme; |
| } |
| |
| mThemeResource = Resources.selectDefaultTheme(mThemeResource, |
| getApplicationInfo().targetSdkVersion); |
| initializeTheme(); |
| |
| return mTheme; |
| } |
| |
| @Override |
| public Object getSystemService(String name) { |
| if (LAYOUT_INFLATER_SERVICE.equals(name)) { |
| if (mInflater == null) { |
| mInflater = LayoutInflater.from(getBaseContext()).cloneInContext(this); |
| } |
| return mInflater; |
| } |
| return getBaseContext().getSystemService(name); |
| } |
| |
| /** |
| * Called by {@link #setTheme} and {@link #getTheme} to apply a theme |
| * resource to the current Theme object. May be overridden to change the |
| * default (simple) behavior. This method will not be called in multiple |
| * threads simultaneously. |
| * |
| * @param theme the theme being modified |
| * @param resId the style resource being applied to <var>theme</var> |
| * @param first {@code true} if this is the first time a style is being |
| * applied to <var>theme</var> |
| */ |
| protected void onApplyThemeResource(Resources.Theme theme, int resId, boolean first) { |
| theme.applyStyle(resId, true); |
| } |
| |
| @UnsupportedAppUsage |
| private void initializeTheme() { |
| final boolean first = mTheme == null; |
| if (first) { |
| mTheme = getResources().newTheme(); |
| final Resources.Theme theme = getBaseContext().getTheme(); |
| if (theme != null) { |
| mTheme.setTo(theme); |
| } |
| } |
| onApplyThemeResource(mTheme, mThemeResource, first); |
| } |
| } |
| |