M7350/base/core/java/android/app/AliasActivity.java

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2024-09-09 08:52:07 +00:00
/*
* Copyright (C) 2007 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 org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.res.XmlResourceParser;
import android.os.Bundle;
import android.util.AttributeSet;
import android.util.Xml;
import com.android.internal.util.XmlUtils;
import java.io.IOException;
/**
* Stub activity that launches another activity (and then finishes itself)
* based on information in its component's manifest meta-data. This is a
* simple way to implement an alias-like mechanism.
*
* To use this activity, you should include in the manifest for the associated
* component an entry named "android.app.alias". It is a reference to an XML
* resource describing an intent that launches the real application.
*/
public class AliasActivity extends Activity {
/**
* This is the name under which you should store in your component the
* meta-data information about the alias. It is a reference to an XML
* resource describing an intent that launches the real application.
* {@hide}
*/
public final String ALIAS_META_DATA = "android.app.alias";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
XmlResourceParser parser = null;
try {
ActivityInfo ai = getPackageManager().getActivityInfo(
getComponentName(), PackageManager.GET_META_DATA);
parser = ai.loadXmlMetaData(getPackageManager(),
ALIAS_META_DATA);
if (parser == null) {
throw new RuntimeException("Alias requires a meta-data field "
+ ALIAS_META_DATA);
}
Intent intent = parseAlias(parser);
if (intent == null) {
throw new RuntimeException(
"No <intent> tag found in alias description");
}
startActivity(intent);
finish();
} catch (PackageManager.NameNotFoundException e) {
throw new RuntimeException("Error parsing alias", e);
} catch (XmlPullParserException e) {
throw new RuntimeException("Error parsing alias", e);
} catch (IOException e) {
throw new RuntimeException("Error parsing alias", e);
} finally {
if (parser != null) parser.close();
}
}
private Intent parseAlias(XmlPullParser parser)
throws XmlPullParserException, IOException {
AttributeSet attrs = Xml.asAttributeSet(parser);
Intent intent = null;
int type;
while ((type=parser.next()) != XmlPullParser.END_DOCUMENT
&& type != XmlPullParser.START_TAG) {
}
String nodeName = parser.getName();
if (!"alias".equals(nodeName)) {
throw new RuntimeException(
"Alias meta-data must start with <alias> tag; found"
+ nodeName + " at " + parser.getPositionDescription());
}
int outerDepth = parser.getDepth();
while ((type=parser.next()) != XmlPullParser.END_DOCUMENT
&& (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) {
if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) {
continue;
}
nodeName = parser.getName();
if ("intent".equals(nodeName)) {
Intent gotIntent = Intent.parseIntent(getResources(), parser, attrs);
if (intent == null) intent = gotIntent;
} else {
XmlUtils.skipCurrentTag(parser);
}
}
return intent;
}
}