diff options
| -rw-r--r-- | core/java/android/view/LayoutInflater.java | 261 |
1 files changed, 182 insertions, 79 deletions
diff --git a/core/java/android/view/LayoutInflater.java b/core/java/android/view/LayoutInflater.java index 723289005651..f2259b045c0a 100644 --- a/core/java/android/view/LayoutInflater.java +++ b/core/java/android/view/LayoutInflater.java @@ -28,6 +28,7 @@ import android.content.res.XmlResourceParser; import android.graphics.Canvas; import android.os.Handler; import android.os.Message; +import android.os.SystemProperties; import android.os.Trace; import android.util.AttributeSet; import android.util.Log; @@ -37,6 +38,9 @@ import android.widget.FrameLayout; import com.android.internal.R; +import dalvik.system.PathClassLoader; +import java.io.File; +import java.lang.reflect.Method; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; @@ -71,6 +75,10 @@ public abstract class LayoutInflater { private static final String TAG = LayoutInflater.class.getSimpleName(); private static final boolean DEBUG = false; + private static final String USE_PRECOMPILED_LAYOUT_SYSTEM_PROPERTY + = "view.precompiled_layout_enabled"; + private static final String COMPILED_VIEW_DEX_FILE_NAME = "/compiled_view.dex"; + /** Empty stack trace used to avoid log spam in re-throw exceptions. */ private static final StackTraceElement[] EMPTY_STACK_TRACE = new StackTraceElement[0]; @@ -92,6 +100,13 @@ public abstract class LayoutInflater { private Factory2 mPrivateFactory; private Filter mFilter; + // Indicates whether we should try to inflate layouts using a precompiled layout instead of + // inflating from the XML resource. + private boolean mUseCompiledView; + // This variable holds the classloader that will be used to look for precompiled layouts. The + // The classloader includes the generated compiled_view.dex file. + private ClassLoader mPrecompiledClassLoader; + @UnsupportedAppUsage final Object[] mConstructorArgs = new Object[2]; @@ -214,6 +229,7 @@ public abstract class LayoutInflater { */ protected LayoutInflater(Context context) { mContext = context; + initPrecompiledViews(); } /** @@ -230,6 +246,7 @@ public abstract class LayoutInflater { mFactory2 = original.mFactory2; mPrivateFactory = original.mPrivateFactory; setFilter(original.mFilter); + initPrecompiledViews(); } /** @@ -371,6 +388,29 @@ public abstract class LayoutInflater { } } + private void initPrecompiledViews() { + try { + mUseCompiledView = + SystemProperties.getBoolean(USE_PRECOMPILED_LAYOUT_SYSTEM_PROPERTY, false); + if (mUseCompiledView) { + mPrecompiledClassLoader = mContext.getClassLoader(); + String dexFile = mContext.getCodeCacheDir() + COMPILED_VIEW_DEX_FILE_NAME; + if (new File(dexFile).exists()) { + mPrecompiledClassLoader = new PathClassLoader(dexFile, mPrecompiledClassLoader); + } else { + // If the precompiled layout file doesn't exist, then disable precompiled + // layouts. + mUseCompiledView = false; + } + } + } catch (Throwable e) { + if (DEBUG) { + Log.e(TAG, "Failed to initialized precompiled views layouts", e); + } + mUseCompiledView = false; + } + } + /** * Inflate a new view hierarchy from the specified xml resource. Throws * {@link InflateException} if there is an error. @@ -427,10 +467,14 @@ public abstract class LayoutInflater { final Resources res = getContext().getResources(); if (DEBUG) { Log.d(TAG, "INFLATING from resource: \"" + res.getResourceName(resource) + "\" (" - + Integer.toHexString(resource) + ")"); + + Integer.toHexString(resource) + ")"); } - final XmlResourceParser parser = res.getLayout(resource); + View view = tryInflatePrecompiled(resource, res, root, attachToRoot); + if (view != null) { + return view; + } + XmlResourceParser parser = res.getLayout(resource); try { return inflate(parser, root, attachToRoot); } finally { @@ -438,6 +482,73 @@ public abstract class LayoutInflater { } } + private @Nullable + View tryInflatePrecompiled(@LayoutRes int resource, Resources res, @Nullable ViewGroup root, + boolean attachToRoot) { + if (!mUseCompiledView) { + return null; + } + + Trace.traceBegin(Trace.TRACE_TAG_VIEW, "inflate (precompiled)"); + + // Try to inflate using a precompiled layout. + String pkg = res.getResourcePackageName(resource); + String layout = res.getResourceEntryName(resource); + + try { + Class clazz = mPrecompiledClassLoader.loadClass("" + pkg + ".CompiledView"); + Method inflater = clazz.getMethod(layout, Context.class, int.class); + View view = (View) inflater.invoke(null, mContext, resource); + + if (view != null && root != null) { + // We were able to use the precompiled inflater, but now we need to do some work to + // attach the view to the root correctly. + XmlResourceParser parser = res.getLayout(resource); + try { + AttributeSet attrs = Xml.asAttributeSet(parser); + advanceToRootNode(parser); + ViewGroup.LayoutParams params = root.generateLayoutParams(attrs); + + if (attachToRoot) { + root.addView(view, params); + } else { + view.setLayoutParams(params); + } + } finally { + parser.close(); + } + } + + return view; + } catch (Throwable e) { + if (DEBUG) { + Log.e(TAG, "Failed to use precompiled view", e); + } + } finally { + Trace.traceEnd(Trace.TRACE_TAG_VIEW); + } + return null; + } + + /** + * Advances the given parser to the first START_TAG. Throws InflateException if no start tag is + * found. + */ + private void advanceToRootNode(XmlPullParser parser) + throws InflateException, IOException, XmlPullParserException { + // Look for the root node. + int type; + while ((type = parser.next()) != XmlPullParser.START_TAG && + type != XmlPullParser.END_DOCUMENT) { + // Empty + } + + if (type != XmlPullParser.START_TAG) { + throw new InflateException(parser.getPositionDescription() + + ": No start tag found!"); + } + } + /** * Inflate a new view hierarchy from the specified XML node. Throws * {@link InflateException} if there is an error. @@ -471,18 +582,7 @@ public abstract class LayoutInflater { View result = root; try { - // Look for the root node. - int type; - while ((type = parser.next()) != XmlPullParser.START_TAG && - type != XmlPullParser.END_DOCUMENT) { - // Empty - } - - if (type != XmlPullParser.START_TAG) { - throw new InflateException(parser.getPositionDescription() - + ": No start tag found!"); - } - + advanceToRootNode(parser); final String name = parser.getName(); if (DEBUG) { @@ -985,82 +1085,85 @@ public abstract class LayoutInflater { + "reference. The layout ID " + value + " is not valid."); } - final XmlResourceParser childParser = context.getResources().getLayout(layout); + final View precompiled = tryInflatePrecompiled(layout, context.getResources(), + (ViewGroup) parent, /*attachToRoot=*/true); + if (precompiled == null) { + final XmlResourceParser childParser = context.getResources().getLayout(layout); - try { - final AttributeSet childAttrs = Xml.asAttributeSet(childParser); + try { + final AttributeSet childAttrs = Xml.asAttributeSet(childParser); - while ((type = childParser.next()) != XmlPullParser.START_TAG && - type != XmlPullParser.END_DOCUMENT) { - // Empty. - } + while ((type = childParser.next()) != XmlPullParser.START_TAG && + type != XmlPullParser.END_DOCUMENT) { + // Empty. + } - if (type != XmlPullParser.START_TAG) { - throw new InflateException(childParser.getPositionDescription() + - ": No start tag found!"); - } + if (type != XmlPullParser.START_TAG) { + throw new InflateException(childParser.getPositionDescription() + + ": No start tag found!"); + } - final String childName = childParser.getName(); + final String childName = childParser.getName(); - if (TAG_MERGE.equals(childName)) { - // The <merge> tag doesn't support android:theme, so - // nothing special to do here. - rInflate(childParser, parent, context, childAttrs, false); - } else { - final View view = createViewFromTag(parent, childName, - context, childAttrs, hasThemeOverride); - final ViewGroup group = (ViewGroup) parent; - - final TypedArray a = context.obtainStyledAttributes( - attrs, R.styleable.Include); - final int id = a.getResourceId(R.styleable.Include_id, View.NO_ID); - final int visibility = a.getInt(R.styleable.Include_visibility, -1); - a.recycle(); - - // We try to load the layout params set in the <include /> tag. - // If the parent can't generate layout params (ex. missing width - // or height for the framework ViewGroups, though this is not - // necessarily true of all ViewGroups) then we expect it to throw - // a runtime exception. - // 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) { - // Ignore, just fail over to child attrs. - } - if (params == null) { - params = group.generateLayoutParams(childAttrs); - } - view.setLayoutParams(params); + if (TAG_MERGE.equals(childName)) { + // The <merge> tag doesn't support android:theme, so + // nothing special to do here. + rInflate(childParser, parent, context, childAttrs, false); + } else { + final View view = createViewFromTag(parent, childName, + context, childAttrs, hasThemeOverride); + final ViewGroup group = (ViewGroup) parent; + + final TypedArray a = context.obtainStyledAttributes( + attrs, R.styleable.Include); + final int id = a.getResourceId(R.styleable.Include_id, View.NO_ID); + final int visibility = a.getInt(R.styleable.Include_visibility, -1); + a.recycle(); + + // We try to load the layout params set in the <include /> tag. + // If the parent can't generate layout params (ex. missing width + // or height for the framework ViewGroups, though this is not + // necessarily true of all ViewGroups) then we expect it to throw + // a runtime exception. + // 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) { + // Ignore, just fail over to child attrs. + } + if (params == null) { + params = group.generateLayoutParams(childAttrs); + } + view.setLayoutParams(params); - // Inflate all children. - rInflateChildren(childParser, view, childAttrs, true); + // Inflate all children. + rInflateChildren(childParser, view, childAttrs, true); - if (id != View.NO_ID) { - view.setId(id); - } + if (id != View.NO_ID) { + view.setId(id); + } - switch (visibility) { - case 0: - view.setVisibility(View.VISIBLE); - break; - case 1: - view.setVisibility(View.INVISIBLE); - break; - case 2: - view.setVisibility(View.GONE); - break; - } + switch (visibility) { + case 0: + view.setVisibility(View.VISIBLE); + break; + case 1: + view.setVisibility(View.INVISIBLE); + break; + case 2: + view.setVisibility(View.GONE); + break; + } - group.addView(view); + group.addView(view); + } + } finally { + childParser.close(); } - } finally { - childParser.close(); } - LayoutInflater.consumeChildElements(parser); } |