diff options
Diffstat (limited to 'core/java/android/view/LayoutInflater.java')
| -rw-r--r-- | core/java/android/view/LayoutInflater.java | 100 |
1 files changed, 53 insertions, 47 deletions
diff --git a/core/java/android/view/LayoutInflater.java b/core/java/android/view/LayoutInflater.java index f692e05..26a5b26 100644 --- a/core/java/android/view/LayoutInflater.java +++ b/core/java/android/view/LayoutInflater.java @@ -20,7 +20,6 @@ import android.graphics.Canvas; import android.os.Handler; import android.os.Message; import android.widget.FrameLayout; -import com.android.internal.R; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; @@ -44,20 +43,20 @@ import java.util.HashMap; * * <pre>LayoutInflater inflater = (LayoutInflater)context.getSystemService * (Context.LAYOUT_INFLATER_SERVICE);</pre> - * + * * <p> * To create a new LayoutInflater with an additional {@link Factory} for your * own views, you can use {@link #cloneInContext} to clone an existing * ViewFactory, and then call {@link #setFactory} on it to include your * Factory. - * + * * <p> * For performance reasons, view inflation relies heavily on pre-processing of * XML files that is done at build time. Therefore, it is not currently possible * to use LayoutInflater with an XmlPullParser over a plain XML file at runtime; * it only works with an XmlPullParser returned from a compiled resource * (R.<em>something</em> file.) - * + * * @see Context#getSystemService */ public abstract class LayoutInflater { @@ -83,7 +82,7 @@ public abstract class LayoutInflater { private static final HashMap<String, Constructor<? extends View>> sConstructorMap = new HashMap<String, Constructor<? extends View>>(); - + private HashMap<String, Boolean> mFilterMap; private static final String TAG_MERGE = "merge"; @@ -94,36 +93,36 @@ public abstract class LayoutInflater { /** * Hook to allow clients of the LayoutInflater to restrict the set of Views that are allowed * to be inflated. - * + * */ public interface Filter { /** * Hook to allow clients of the LayoutInflater to restrict the set of Views * that are allowed to be inflated. - * + * * @param clazz The class object for the View that is about to be inflated - * + * * @return True if this class is allowed to be inflated, or false otherwise */ @SuppressWarnings("unchecked") boolean onLoadClass(Class clazz); } - + public interface Factory { /** * Hook you can supply that is called when inflating from a LayoutInflater. * You can use this to customize the tag names available in your XML * layout files. - * + * * <p> * Note that it is good practice to prefix these custom names with your * package (i.e., com.coolcompany.apps) to avoid conflicts with system * names. - * + * * @param name Tag name to be inflated. * @param context The context the view is being created in. * @param attrs Inflation attributes as specified in XML file. - * + * * @return View Newly created view. Return null for the default * behavior. */ @@ -151,14 +150,14 @@ public abstract class LayoutInflater { private static class FactoryMerger implements Factory2 { private final Factory mF1, mF2; private final Factory2 mF12, mF22; - + FactoryMerger(Factory f1, Factory2 f12, Factory f2, Factory2 f22) { mF1 = f1; mF2 = f2; mF12 = f12; mF22 = f22; } - + public View onCreateView(String name, Context context, AttributeSet attrs) { View v = mF1.onCreateView(name, context, attrs); if (v != null) return v; @@ -173,13 +172,13 @@ public abstract class LayoutInflater { : mF2.onCreateView(name, context, attrs); } } - + /** * Create a new LayoutInflater instance associated with a particular Context. * Applications will almost always want to use * {@link Context#getSystemService Context.getSystemService()} to retrieve * the standard {@link Context#LAYOUT_INFLATER_SERVICE Context.INFLATER_SERVICE}. - * + * * @param context The Context in which this LayoutInflater will create its * Views; most importantly, this supplies the theme from which the default * values for their attributes are retrieved. @@ -192,7 +191,7 @@ public abstract class LayoutInflater { * Create a new LayoutInflater instance that is a copy of an existing * LayoutInflater, optionally with its Context changed. For use in * implementing {@link #cloneInContext}. - * + * * @param original The original LayoutInflater to copy. * @param newContext The new Context to use. */ @@ -203,7 +202,7 @@ public abstract class LayoutInflater { mPrivateFactory = original.mPrivateFactory; mFilter = original.mFilter; } - + /** * Obtains the LayoutInflater from the given context. */ @@ -221,15 +220,15 @@ public abstract class LayoutInflater { * pointing to a different Context than the original. This is used by * {@link ContextThemeWrapper} to create a new LayoutInflater to go along * with the new Context theme. - * + * * @param newContext The new Context to associate with the new LayoutInflater. * May be the same as the original Context if desired. - * + * * @return Returns a brand spanking new LayoutInflater object associated with * the given Context. */ public abstract LayoutInflater cloneInContext(Context newContext); - + /** * Return the context we are running in, for access to resources, class * loader, etc. @@ -265,7 +264,7 @@ public abstract class LayoutInflater { * called on each element name as the xml is parsed. If the factory returns * a View, that is added to the hierarchy. If it returns null, the next * factory default {@link #onCreateView} method is called. - * + * * <p>If you have an existing * LayoutInflater and want to add your own factory to it, use * {@link #cloneInContext} to clone the existing instance and then you @@ -321,13 +320,13 @@ public abstract class LayoutInflater { public Filter getFilter() { return mFilter; } - + /** * Sets the {@link Filter} to by this LayoutInflater. If a view is attempted to be inflated * which is not allowed by the {@link Filter}, the {@link #inflate(int, ViewGroup)} call will * throw an {@link InflateException}. This filter will replace any previous filter set on this * LayoutInflater. - * + * * @param filter The Filter which restricts the set of Views that are allowed to be inflated. * This filter will replace any previous filter set on this LayoutInflater. */ @@ -341,7 +340,7 @@ public abstract class LayoutInflater { /** * Inflate a new view hierarchy from the specified xml resource. Throws * {@link InflateException} if there is an error. - * + * * @param resource ID for an XML layout resource to load (e.g., * <code>R.layout.main_page</code>) * @param root Optional view to be the parent of the generated hierarchy. @@ -361,7 +360,7 @@ public abstract class LayoutInflater { * reasons, view inflation relies heavily on pre-processing of XML files * that is done at build time. Therefore, it is not currently possible to * use LayoutInflater with an XmlPullParser over a plain XML file at runtime. - * + * * @param parser XML dom node containing the description of the view * hierarchy. * @param root Optional view to be the parent of the generated hierarchy. @@ -376,7 +375,7 @@ public abstract class LayoutInflater { /** * Inflate a new view hierarchy from the specified xml resource. Throws * {@link InflateException} if there is an error. - * + * * @param resource ID for an XML layout resource to load (e.g., * <code>R.layout.main_page</code>) * @param root Optional view to be the parent of the generated hierarchy (if @@ -408,7 +407,7 @@ public abstract class LayoutInflater { * reasons, view inflation relies heavily on pre-processing of XML files * that is done at build time. Therefore, it is not currently possible to * use LayoutInflater with an XmlPullParser over a plain XML file at runtime. - * + * * @param parser XML dom node containing the description of the view * hierarchy. * @param root Optional view to be the parent of the generated hierarchy (if @@ -443,7 +442,7 @@ public abstract class LayoutInflater { } final String name = parser.getName(); - + if (DEBUG) { System.out.println("**************************"); System.out.println("Creating root view: " @@ -529,17 +528,17 @@ public abstract class LayoutInflater { * Low-level function for instantiating a view by name. This attempts to * instantiate a view class of the given <var>name</var> found in this * LayoutInflater's ClassLoader. - * + * * <p> * There are two things that can happen in an error case: either the * exception describing the error will be thrown, or a null will be * returned. You must deal with both possibilities -- the former will happen * the first time createView() is called for a class of a particular name, * the latter every time there-after for that class name. - * + * * @param name The full name of the class to be instantiated. * @param attrs The XML attributes supplied for this instance. - * + * * @return View The newly instantiated view, or null. */ public final View createView(String name, String prefix, AttributeSet attrs) @@ -552,7 +551,7 @@ public abstract class LayoutInflater { // Class not found in the cache, see if it's real, and try to add it clazz = mContext.getClassLoader().loadClass( prefix != null ? (prefix + name) : name).asSubclass(View.class); - + if (mFilter != null && clazz != null) { boolean allowed = mFilter.onLoadClass(clazz); if (!allowed) { @@ -570,7 +569,7 @@ public abstract class LayoutInflater { // New class -- remember whether it is allowed clazz = mContext.getClassLoader().loadClass( prefix != null ? (prefix + name) : name).asSubclass(View.class); - + boolean allowed = clazz != null && mFilter.onLoadClass(clazz); mFilterMap.put(name, allowed); if (!allowed) { @@ -633,10 +632,10 @@ public abstract class LayoutInflater { * given the xml element name. Override it to handle custom view objects. If * you override this in your subclass be sure to call through to * super.onCreateView(name) for names you do not recognize. - * + * * @param name The fully qualified class name of the View to be create. * @param attrs An AttributeSet of attributes to apply to the View. - * + * * @return View The View created. */ protected View onCreateView(String name, AttributeSet attrs) @@ -680,7 +679,7 @@ public abstract class LayoutInflater { if (view == null && mPrivateFactory != null) { view = mPrivateFactory.onCreateView(parent, name, mContext, attrs); } - + if (view == null) { if (-1 == name.indexOf('.')) { view = onCreateView(parent, name, attrs); @@ -727,7 +726,7 @@ public abstract class LayoutInflater { } final String name = parser.getName(); - + if (TAG_REQUEST_FOCUS.equals(name)) { parseRequestFocus(parser, parent); } else if (TAG_INCLUDE.equals(name)) { @@ -742,7 +741,7 @@ public abstract class LayoutInflater { final ViewGroup viewGroup = (ViewGroup) parent; final ViewGroup.LayoutParams params = viewGroup.generateLayoutParams(attrs); rInflate(parser, view, attrs, true); - viewGroup.addView(view, params); + viewGroup.addView(view, params); } else { final View view = createViewFromTag(parent, name, attrs); final ViewGroup viewGroup = (ViewGroup) parent; @@ -811,14 +810,21 @@ public abstract class LayoutInflater { // We try to load the layout params set in the <include /> tag. If // they don't exist, we will rely on the layout params set in the // included XML file. - TypedArray ta = getContext().obtainStyledAttributes(attrs, - R.styleable.ViewGroup_Layout); - boolean definesBothWidthAndHeight = - ta.hasValue(R.styleable.ViewGroup_Layout_layout_width) && - ta.hasValue(R.styleable.ViewGroup_Layout_layout_height); - AttributeSet attributes = definesBothWidthAndHeight ? attrs : childAttrs; - view.setLayoutParams(group.generateLayoutParams(attributes)); - ta.recycle(); + // During a layoutparams generation, a runtime exception is thrown + // if either layout_width or layout_height is missing. We catch + // this exception and set localParams accordingly: true means we + // successfully loaded layout params from the <include /> tag, + // false means we need to rely on the included layout params. + ViewGroup.LayoutParams params = null; + try { + params = group.generateLayoutParams(attrs); + } catch (RuntimeException e) { + params = group.generateLayoutParams(childAttrs); + } finally { + if (params != null) { + view.setLayoutParams(params); + } + } // Inflate all children. rInflate(childParser, view, childAttrs, true); |