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Commit 7f775243 authored by Xavier Ducrohet's avatar Xavier Ducrohet
Browse files

Layoutlib: Load fragments 

This change does the following:
- Make the bridge context extend Activity instead of Context
so that it can act as a view factory. This is needed because
the Activity is used as factory for Fragment objects.

- Override the default Fragment.instantiate(...) method
through a delegate. This is done to load the Fragment
classes located in the project (similar to custom views).

Change-Id: If62e7c9ff2b7585677077ad825aa1c3591d1b5e0
parent c9f32f23

tools/layoutlib/bridge/src/android/app/Fragment_Delegate.java

0 → 100644
+101 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2010 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.app;



import com.android.layoutlib.api.IProjectCallback;



import android.content.Context;

import android.os.Bundle;



/**

 * Delegate used to provide new implementation of a select few methods of {@link Fragment}

 *

 * Through the layoutlib_create tool, the original  methods of Fragment have been replaced

 * by calls to methods of the same name in this delegate class.

 *

 * The methods being re-implemented are the ones responsible for instantiating Fragment objects.

 * Because the classes of these objects are found in the project, these methods need access to

 * {@link IProjectCallback} object. They are however static methods, so the callback is set

 * before the inflation through {@link #setProjectCallback(IProjectCallback)}.

 */

public class Fragment_Delegate {



    private static IProjectCallback sProjectCallback;



    /**

     * Sets the current {@link IProjectCallback} to be used to instantiate classes coming

     * from the project being rendered.

     */

    public static void setProjectCallback(IProjectCallback projectCallback) {

        sProjectCallback = projectCallback;

    }



    /**

     * Like {@link #instantiate(Context, String, Bundle)} but with a null

     * argument Bundle.

     */

    /*package*/ static Fragment instantiate(Context context, String fname) {

        return instantiate(context, fname, null);

    }



    /**

     * Create a new instance of a Fragment with the given class name.  This is

     * the same as calling its empty constructor.

     *

     * @param context The calling context being used to instantiate the fragment.

     * This is currently just used to get its ClassLoader.

     * @param fname The class name of the fragment to instantiate.

     * @param args Bundle of arguments to supply to the fragment, which it

     * can retrieve with {@link #getArguments()}.  May be null.

     * @return Returns a new fragment instance.

     * @throws InstantiationException If there is a failure in instantiating

     * the given fragment class.  This is a runtime exception; it is not

     * normally expected to happen.

     */

    /*package*/ static Fragment instantiate(Context context, String fname, Bundle args) {

        try {

            if (sProjectCallback != null) {

                Fragment f = (Fragment) sProjectCallback.loadView(fname,

                        new Class[0], new Object[0]);



                if (args != null) {

                    args.setClassLoader(f.getClass().getClassLoader());

                    f.mArguments = args;

                }

                return f;

            }



            return null;

        } catch (ClassNotFoundException e) {

            throw new Fragment.InstantiationException("Unable to instantiate fragment " + fname

                    + ": make sure class name exists, is public, and has an"

                    + " empty constructor that is public", e);

        } catch (java.lang.InstantiationException e) {

            throw new Fragment.InstantiationException("Unable to instantiate fragment " + fname

                    + ": make sure class name exists, is public, and has an"

                    + " empty constructor that is public", e);

        } catch (IllegalAccessException e) {

            throw new Fragment.InstantiationException("Unable to instantiate fragment " + fname

                    + ": make sure class name exists, is public, and has an"

                    + " empty constructor that is public", e);

        } catch (Exception e) {

            throw new Fragment.InstantiationException("Unable to instantiate fragment " + fname

                    + ": make sure class name exists, is public, and has an"

                    + " empty constructor that is public", e);

        }

    }

}

tools/layoutlib/bridge/src/com/android/layoutlib/bridge/Bridge.java

+14 −6
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ import com.android.ninepatch.NinePatch; 
import com.android.tools.layoutlib.create.MethodAdapter;

import com.android.tools.layoutlib.create.OverrideMethod;



import android.app.Fragment_Delegate;

import android.content.ClipData;

import android.content.res.Configuration;

import android.graphics.Bitmap;
@@ -366,6 +367,12 @@ public final class Bridge implements ILayoutBridge { 


        BridgeContext context = null;

        try {

            // we need to make sure the Looper has been initialized for this thread.

            // this is required for View that creates Handler objects.

            if (Looper.myLooper() == null) {

                Looper.prepare();

            }



            // setup the display Metrics.

            DisplayMetrics metrics = new DisplayMetrics();

            metrics.densityDpi = density;
@@ -380,6 +387,7 @@ public final class Bridge implements ILayoutBridge { 
                    frameworkResources, styleParentMap, customViewLoader, logger);

            BridgeInflater inflater = new BridgeInflater(context, customViewLoader);

            context.setBridgeInflater(inflater);

            inflater.setFactory2(context);



            IResourceValue windowBackground = null;

            int screenOffset = 0;
@@ -390,22 +398,22 @@ public final class Bridge implements ILayoutBridge { 
                screenOffset = getScreenOffset(frameworkResources, currentTheme, context);

            }



            // we need to make sure the Looper has been initialized for this thread.

            // this is required for View that creates Handler objects.

            if (Looper.myLooper() == null) {

                Looper.prepare();

            }



            BridgeXmlBlockParser parser = new BridgeXmlBlockParser(layoutDescription,

                    context, false /* platformResourceFlag */);



            ViewGroup root = new FrameLayout(context);



            // Sets the project callback (custom view loader) to the fragment delegate so that

            // it can instantiate the custom Fragment.

            Fragment_Delegate.setProjectCallback(customViewLoader);



            View view = inflater.inflate(parser, root);



            // post-inflate process. For now this supports TabHost/TabWidget

            postInflateProcess(view, customViewLoader);



            Fragment_Delegate.setProjectCallback(null);



            // set the AttachInfo on the root view.

            AttachInfo info = new AttachInfo(new WindowSession(), new Window(),

                    new Handler(), null);

tools/layoutlib/bridge/src/com/android/layoutlib/bridge/BridgeContext.java

+15 −1
Original line number Diff line number Diff line
@@ -21,6 +21,8 @@ import com.android.layoutlib.api.IProjectCallback; 
import com.android.layoutlib.api.IResourceValue;

import com.android.layoutlib.api.IStyleResourceValue;



import android.app.Activity;

import android.app.Fragment;

import android.content.BroadcastReceiver;

import android.content.ComponentName;

import android.content.ContentResolver;
@@ -49,6 +51,7 @@ import android.os.Looper; 
import android.util.AttributeSet;

import android.util.DisplayMetrics;

import android.view.BridgeInflater;

import android.view.LayoutInflater;

import android.view.View;



import java.io.File;
@@ -65,7 +68,7 @@ import java.util.Map.Entry; 
/**

 * Custom implementation of Context to handle non compiled resources.

 */

public final class BridgeContext extends Context {

public final class BridgeContext extends Activity {



    private final Resources mResources;

    private final Theme mTheme;
@@ -129,6 +132,9 @@ public final class BridgeContext extends Context { 
        mProjectResources = projectResources;

        mFrameworkResources = frameworkResources;

        mStyleInheritanceMap = styleInheritanceMap;



        mFragments.mCurState = Fragment.CREATED;

        mFragments.mActivity = this;

    }



    public void setBridgeInflater(BridgeInflater inflater) {
@@ -155,6 +161,14 @@ public final class BridgeContext extends Context { 
        return mLogger;

    }





    // ------------- Activity Methods



    @Override

    public LayoutInflater getLayoutInflater() {

        return mInflater;

    }



    // ------------ Context methods



    @Override

tools/layoutlib/create/src/com/android/tools/layoutlib/create/CreateInfo.java

+1 −0
Original line number Diff line number Diff line
@@ -94,6 +94,7 @@ public final class CreateInfo implements ICreateInfo { 
     * The list of methods to rewrite as delegates.

     */

    private final static String[] DELEGATE_METHODS = new String[] {

        "android.app.Fragment#instantiate", //(Landroid/content/Context;Ljava/lang/String;Landroid/os/Bundle;)Landroid/app/Fragment;",

        // TODO: comment out once DelegateClass is working

        // "android.view.View#isInEditMode",

        // "android.content.res.Resources$Theme#obtainStyledAttributes",

tools/layoutlib/create/src/com/android/tools/layoutlib/create/Main.java

+4 −1
Original line number Diff line number Diff line
@@ -66,7 +66,10 @@ public class Main { 
            AsmGenerator agen = new AsmGenerator(log, osDestJar[0], new CreateInfo());



            AsmAnalyzer aa = new AsmAnalyzer(log, osJarPath, agen,

                    new String[] { "android.view.View" },   // derived from

                    new String[] {                          // derived from

                        "android.view.View",

                        "android.app.Fragment"

                    },

                    new String[] {                          // include classes

                        "android.*", // for android.R

                        "android.util.*",