125 lines
4.4 KiB
Java
125 lines
4.4 KiB
Java
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.app;
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import org.xmlpull.v1.XmlPullParser;
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import org.xmlpull.v1.XmlPullParserException;
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import android.content.Intent;
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import android.content.pm.ActivityInfo;
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import android.content.pm.PackageManager;
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import android.content.res.XmlResourceParser;
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import android.os.Bundle;
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import android.util.AttributeSet;
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import android.util.Xml;
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import com.android.internal.util.XmlUtils;
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import java.io.IOException;
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/**
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* Stub activity that launches another activity (and then finishes itself)
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* based on information in its component's manifest meta-data. This is a
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* simple way to implement an alias-like mechanism.
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*
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* To use this activity, you should include in the manifest for the associated
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* component an entry named "android.app.alias". It is a reference to an XML
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* resource describing an intent that launches the real application.
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*/
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public class AliasActivity extends Activity {
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/**
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* This is the name under which you should store in your component the
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* meta-data information about the alias. It is a reference to an XML
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* resource describing an intent that launches the real application.
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* {@hide}
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*/
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public final String ALIAS_META_DATA = "android.app.alias";
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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XmlResourceParser parser = null;
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try {
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ActivityInfo ai = getPackageManager().getActivityInfo(
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getComponentName(), PackageManager.GET_META_DATA);
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parser = ai.loadXmlMetaData(getPackageManager(),
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ALIAS_META_DATA);
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if (parser == null) {
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throw new RuntimeException("Alias requires a meta-data field "
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+ ALIAS_META_DATA);
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}
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Intent intent = parseAlias(parser);
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if (intent == null) {
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throw new RuntimeException(
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"No <intent> tag found in alias description");
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}
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startActivity(intent);
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finish();
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} catch (PackageManager.NameNotFoundException e) {
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throw new RuntimeException("Error parsing alias", e);
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} catch (XmlPullParserException e) {
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throw new RuntimeException("Error parsing alias", e);
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} catch (IOException e) {
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throw new RuntimeException("Error parsing alias", e);
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} finally {
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if (parser != null) parser.close();
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}
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}
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private Intent parseAlias(XmlPullParser parser)
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throws XmlPullParserException, IOException {
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AttributeSet attrs = Xml.asAttributeSet(parser);
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Intent intent = null;
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int type;
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while ((type=parser.next()) != XmlPullParser.END_DOCUMENT
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&& type != XmlPullParser.START_TAG) {
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}
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String nodeName = parser.getName();
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if (!"alias".equals(nodeName)) {
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throw new RuntimeException(
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"Alias meta-data must start with <alias> tag; found"
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+ nodeName + " at " + parser.getPositionDescription());
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}
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int outerDepth = parser.getDepth();
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while ((type=parser.next()) != XmlPullParser.END_DOCUMENT
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&& (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) {
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if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) {
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continue;
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}
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nodeName = parser.getName();
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if ("intent".equals(nodeName)) {
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Intent gotIntent = Intent.parseIntent(getResources(), parser, attrs);
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if (intent == null) intent = gotIntent;
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} else {
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XmlUtils.skipCurrentTag(parser);
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}
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}
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return intent;
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}
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}
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