开机默认Launcher

LAUNCH BY DEFAULT

You've chosen to launch this app by default for some actions.

packages\apps\Provision\src\com\android\provision\DefaultActivity.java

/* * Copyright (C) 2008 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 com.android.provision;import android.app.Activity;import android.content.ComponentName;import android.content.Intent;import android.content.IntentFilter;import android.content.pm.PackageManager;import android.content.pm.ResolveInfo;import android.os.Bundle;import android.os.SystemProperties;import android.provider.Settings;import android.util.Log;import java.util.List;/** * Application that sets the provisioned bit, like SetupWizard does. */public class DefaultActivity extends Activity {private static final String TAG = "DefaultActivity";    @Override    protected void onCreate(Bundle icicle) {        super.onCreate(icicle);        // Add a persistent setting to allow other apps to know the device has been provisioned.        Settings.Global.putInt(getContentResolver(), Settings.Global.DEVICE_PROVISIONED, 1);        // remove this activity from the package manager.        PackageManager pm = getPackageManager();        Intent intent = new Intent(Intent.ACTION_MAIN);        intent.addCategory(Intent.CATEGORY_HOME);        List<ResolveInfo> resolveInfoList = pm.queryIntentActivities(intent, 0);        if(resolveInfoList != null) {            int size = resolveInfoList.size();            for(int j=0; j<size; j++) {                final ResolveInfo r = resolveInfoList.get(j);                if(r.activityInfo.packageName.equals(this.getPackageName())) {                    resolveInfoList.remove(j);                    size -= 1;                    break;                }            }            ComponentName[] set = new ComponentName[size];            String defaultLauncherPackage = SystemProperties.get("ro.defaultlauncher.package", "com.android.launcher2");            String defaultLauncherClass = SystemProperties.get("ro.defaultlauncher.class", "com.android.launcher2.Launcher");            ComponentName defaultLauncher = new ComponentName(defaultLauncherPackage, defaultLauncherClass);            int defaultMach = 0;            for(int i=0; i<size; i++) {                final ResolveInfo resolveInfo = resolveInfoList.get(i);                Log.d(TAG, resolveInfo.toString());                set[i] = new ComponentName(resolveInfo.activityInfo.packageName, resolveInfo.activityInfo.name);                if(defaultLauncher.getClassName().equals(resolveInfo.activityInfo.name)) {                    defaultMach = resolveInfo.match;                }            }            Log.d(TAG, "defaultMatch="+Integer.toHexString(defaultMach));            IntentFilter filter = new IntentFilter();            filter.addAction(Intent.ACTION_MAIN);            filter.addCategory(Intent.CATEGORY_HOME);            filter.addCategory(Intent.CATEGORY_DEFAULT);            pm.clearPackagePreferredActivities(defaultLauncher.getPackageName());            pm.addPreferredActivity(filter, defaultMach, set, defaultLauncher);        } else {            Log.d(TAG, "****resolveInfoList is null.");        }        ComponentName name = new ComponentName(this, DefaultActivity.class);        pm.setComponentEnabledSetting(name, PackageManager.COMPONENT_ENABLED_STATE_DISABLED,                PackageManager.DONT_KILL_APP);        // terminate the activity.        finish();         }}

另外参考frameworks\base\services\java\com\android\server\pm\PackageManagerService.java

ResolveInfo findPreferredActivity(Intent intent, String resolvedType,            int flags, List<ResolveInfo> query, int priority, int userId) {        if (!sUserManager.exists(userId)) return null;        // writer        synchronized (mPackages) {            if (intent.getSelector() != null) {                intent = intent.getSelector();             }            if (DEBUG_PREFERRED) intent.addFlags(Intent.FLAG_DEBUG_LOG_RESOLUTION);            PreferredIntentResolver pir = mSettings.mPreferredActivities.get(userId);            List<PreferredActivity> prefs = pir != null                    ? pir.queryIntent(intent, resolvedType,                            (flags & PackageManager.MATCH_DEFAULT_ONLY) != 0, userId)                    : null;            if (prefs != null && prefs.size() > 0) {                // First figure out how good the original match set is.                // We will only allow preferred activities that came                // from the same match quality.                int match = 0;                if (DEBUG_PREFERRED) {                    Log.v(TAG, "Figuring out best match...");                }                final int N = query.size();                for (int j=0; j<N; j++) {                    final ResolveInfo ri = query.get(j);                    if (DEBUG_PREFERRED) {                        Log.v(TAG, "Match for " + ri.activityInfo + ": 0x"                                + Integer.toHexString(match));                    }                    if (ri.match > match) {                        match = ri.match;                    }                }                if (DEBUG_PREFERRED) {                    Log.v(TAG, "Best match: 0x" + Integer.toHexString(match));                }                match &= IntentFilter.MATCH_CATEGORY_MASK;                final int M = prefs.size();                for (int i=0; i<M; i++) {                    final PreferredActivity pa = prefs.get(i);                    if (pa.mPref.mMatch != match) {                        continue;                    }                    final ActivityInfo ai = getActivityInfo(pa.mPref.mComponent,                            flags | PackageManager.GET_DISABLED_COMPONENTS, userId);                    if (DEBUG_PREFERRED) {                        Log.v(TAG, "Got preferred activity:");                        if (ai != null) {                            ai.dump(new LogPrinter(Log.VERBOSE, TAG), "  ");                        } else {                            Log.v(TAG, "  null");                        }                    }                    if (ai == null) {                        // This previously registered preferred activity                        // component is no longer known.  Most likely an update                        // to the app was installed and in the new version this                        // component no longer exists.  Clean it up by removing                        // it from the preferred activities list, and skip it.                        Slog.w(TAG, "Removing dangling preferred activity: "                                + pa.mPref.mComponent);                        pir.removeFilter(pa);                        continue;                    }                    for (int j=0; j<N; j++) {                        final ResolveInfo ri = query.get(j);                        if (!ri.activityInfo.applicationInfo.packageName                                .equals(ai.applicationInfo.packageName)) {                            continue;                        }                        if (!ri.activityInfo.name.equals(ai.name)) {                            continue;                        }                        // Okay we found a previously set preferred app.                        // If the result set is different from when this                        // was created, we need to clear it and re-ask the                        // user their preference.                        if (!pa.mPref.sameSet(query, priority)) {                            Slog.i(TAG, "Result set changed, dropping preferred activity for "                                    + intent + " type " + resolvedType);                            pir.removeFilter(pa);                            return null;                        }                        // Yay!                        return ri;                    }                }            }        }        return null;    }