android 加载已经安装的apk方式

 private void loadAllAppsByBatch() {
            final long t = DEBUG_LOADERS ? SystemClock.uptimeMillis() : 0;

            // Don't use these two variables in any of the callback runnables.
            // Otherwise we hold a reference to them.
            final Callbacks oldCallbacks = mCallbacks.get();
            if (oldCallbacks == null) {
                // This launcher has exited and nobody bothered to tell us.  Just bail.
                Log.w(TAG, "LoaderTask running with no launcher (loadAllAppsByBatch)");
                return;
            }

            final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
            mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);

            final PackageManager packageManager = mContext.getPackageManager();
            List<ResolveInfo> apps = null;

            int N = Integer.MAX_VALUE;

            int startIndex;
            int i=0;
            int batchSize = -1;
            while (i < N && !mStopped) {
                if (i == 0) {
                    mAllAppsList.clear();
                    final long qiaTime = DEBUG_LOADERS ? SystemClock.uptimeMillis() : 0;
                    apps = packageManager.queryIntentActivities(mainIntent, 0);
                    if (DEBUG_LOADERS) {
                        Log.d(TAG, "queryIntentActivities took "
                                + (SystemClock.uptimeMillis()-qiaTime) + "ms");
                    }
                    if (apps == null) {
                        return;
                    }
                    N = apps.size();
                    if (DEBUG_LOADERS) {
                        Log.d(TAG, "queryIntentActivities got " + N + " apps");
                    }
                    if (N == 0) {
                        // There are no apps?!?
                        return;
                    }
                    if (mBatchSize == 0) {
                        batchSize = N;
                    } else {
                        batchSize = mBatchSize;
                    }

                    final long sortTime = DEBUG_LOADERS ? SystemClock.uptimeMillis() : 0;
                    Collections.sort(apps,
                            new LauncherModel.ShortcutNameComparator(packageManager, mLabelCache));
                    if (DEBUG_LOADERS) {
                        Log.d(TAG, "sort took "
                                + (SystemClock.uptimeMillis()-sortTime) + "ms");
                    }
                }

                final long t2 = DEBUG_LOADERS ? SystemClock.uptimeMillis() : 0;

                startIndex = i;
                for (int j=0; i<N && j<batchSize; j++) {
                    // This builds the icon bitmaps.
                    mAllAppsList.add(new ApplicationInfo(packageManager, apps.get(i),
                            mIconCache, mLabelCache));
                    i++;
                }

                final boolean first = i <= batchSize;
                final Callbacks callbacks = tryGetCallbacks(oldCallbacks);
                final ArrayList<ApplicationInfo> added = mAllAppsList.added;
                mAllAppsList.added = new ArrayList<ApplicationInfo>();

                mHandler.post(new Runnable() {
                    public void run() {
                        final long t = SystemClock.uptimeMillis();
                        if (callbacks != null) {
                            if (first) {
                                callbacks.bindAllApplications(added);
                            } else {
                                callbacks.bindAppsAdded(added);
                            }
                            if (DEBUG_LOADERS) {
                                Log.d(TAG, "bound " + added.size() + " apps in "
                                    + (SystemClock.uptimeMillis() - t) + "ms");
                            }
                        } else {
                            Log.i(TAG, "not binding apps: no Launcher activity");
                        }
                    }
                });

                if (DEBUG_LOADERS) {
                    Log.d(TAG, "batch of " + (i-startIndex) + " icons processed in "
                            + (SystemClock.uptimeMillis()-t2) + "ms");
                }

                if (mAllAppsLoadDelay > 0 && i < N) {
                    try {
                        if (DEBUG_LOADERS) {
                            Log.d(TAG, "sleeping for " + mAllAppsLoadDelay + "ms");
                        }
                        Thread.sleep(mAllAppsLoadDelay);
                    } catch (InterruptedException exc) { }
                }
            }

            if (DEBUG_LOADERS) {
                Log.d(TAG, "cached all " + N + " apps in "
                        + (SystemClock.uptimeMillis()-t) + "ms"
                        + (mAllAppsLoadDelay > 0 ? " (including delay)" : ""));
            }
        }

 

 

 public ApplicationInfo(PackageManager pm, ResolveInfo info, IconCache iconCache,
            HashMap<Object, CharSequence> labelCache) {
        final String packageName = info.activityInfo.applicationInfo.packageName;

        this.componentName = new ComponentName(packageName, info.activityInfo.name);
        this.container = ItemInfo.NO_ID;
        this.setActivity(componentName,
                Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

        try {
            int appFlags = pm.getApplicationInfo(packageName, 0).flags;
            if ((appFlags & android.content.pm.ApplicationInfo.FLAG_SYSTEM) == 0) {
                flags |= DOWNLOADED_FLAG;

                if ((appFlags & android.content.pm.ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0) {
                    flags |= UPDATED_SYSTEM_APP_FLAG;
                }
            }
            firstInstallTime = pm.getPackageInfo(packageName, 0).firstInstallTime;
        } catch (NameNotFoundException e) {
            Log.d(TAG, "PackageManager.getApplicationInfo failed for " + packageName);
        }

        iconCache.getTitleAndIcon(this, info, labelCache);
    }