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インストールされているアプリケーションのリストを取得し、それらをListViewでユーザーに表示する方法について、さまざまなコードのバリエーションを調べましたが、どれも成功していません。私が知りたいのは、これを行う方法と、フラグ（？）を追加して、LONG_SEARCH_BUTTONなどのさまざまなインテントフィルターを持つカーテンアプリケーションを一覧表示し、パッケージとランチャーを表示できるようにする方法です。そのアプリケーションのクラス..これが可能であれば？

コードのビットをつなぎ合わせようとすると非常にストレスがかかるので、誰かが知識を共有することを気にしないのであれば、完全なJavaクラスが欲しいです！私はAndroidを数か月コーディングしているので、基本的なことのほとんどを知っています（私は考えたいです...）が、以前はこのようなことは何もしていません。

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2 に答える 2

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私はまさにそれを行う短いアプリケーションを書きました...ここでそれをチェックしてください。

于 2012-10-07T20:07:10.677 に答える
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これは、Androidドキュメントのサンプルコードです。要件に合わせてクリエイティブになってください。

/ ** *このクラスは、ローダー内のアイテムごとのデータを保持します。* / public static class AppEntry {public AppEntry（AppListLoader loader、ApplicationInfo info）{mLoader = loader; mInfo = info; mApkFile = new File（info.sourceDir）; }

public ApplicationInfo getApplicationInfo() {
    return mInfo;
}

public String getLabel() {
    return mLabel;
}

public Drawable getIcon() {
    if (mIcon == null) {
        if (mApkFile.exists()) {
            mIcon = mInfo.loadIcon(mLoader.mPm);
            return mIcon;
        } else {
            mMounted = false;
        }
    } else if (!mMounted) {
        // If the app wasn't mounted but is now mounted, reload
        // its icon.
        if (mApkFile.exists()) {
            mMounted = true;
            mIcon = mInfo.loadIcon(mLoader.mPm);
            return mIcon;
        }
    } else {
        return mIcon;
    }

    return mLoader.getContext().getResources().getDrawable(
            android.R.drawable.sym_def_app_icon);
}

@Override public String toString() {
    return mLabel;
}

void loadLabel(Context context) {
    if (mLabel == null || !mMounted) {
        if (!mApkFile.exists()) {
            mMounted = false;
            mLabel = mInfo.packageName;
        } else {
            mMounted = true;
            CharSequence label = mInfo.loadLabel(context.getPackageManager());
            mLabel = label != null ? label.toString() : mInfo.packageName;
        }
    }
}

private final AppListLoader mLoader;
private final ApplicationInfo mInfo;
private final File mApkFile;
private String mLabel;
private Drawable mIcon;
private boolean mMounted; }

/***アプリケーションエントリオブジェクトのアルファベット順の比較を実行します。* / public static final Comparator ALPHA_COMPARATOR = new Comparator（）{private final Collat​​or sCollat​​or = Collat​​or.getInstance（）; @Override public int compare（AppEntry object1、AppEntry object2）{return sCollat​​or.compare（object1.getLabel（）、object2.getLabel（））; }};

/ ** *構成が興味深い方法で変更されたかどうかを判断するためのヘルパー*なので、アプリリストを再構築する必要があります。* / public static class InterestingConfigChanges {final Configuration mLastConfiguration = new Configuration（）; int mLastDensity;

boolean applyNewConfig(Resources res) {
    int configChanges = mLastConfiguration.updateFrom(res.getConfiguration());
    boolean densityChanged = mLastDensity != res.getDisplayMetrics().densityDpi;
    if (densityChanged || (configChanges&(ActivityInfo.CONFIG_LOCALE
            |ActivityInfo.CONFIG_UI_MODE|ActivityInfo.CONFIG_SCREEN_LAYOUT)) != 0)

{mLastDensity = res.getDisplayMetrics（）。densityDpi; trueを返します。}falseを返します。}}

/***ローダーが更新できるように*インストールされたアプリへの興味深い変更を探すヘルパークラス。* / public static class PackageIntentReceiver extends BroadcastReceiver {final AppListLoader mLoader;

public PackageIntentReceiver(AppListLoader loader) {
    mLoader = loader;
    IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_ADDED);
    filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
    filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
    filter.addDataScheme("package");
    mLoader.getContext().registerReceiver(this, filter);
    // Register for events related to sdcard installation.
    IntentFilter sdFilter = new IntentFilter();
    sdFilter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE);
    sdFilter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE);
    mLoader.getContext().registerReceiver(this, sdFilter);
}

@Override public void onReceive(Context context, Intent intent) {
    // Tell the loader about the change.
    mLoader.onContentChanged();
} }

/***インストールされているすべてのアプリケーションをロードするカスタムローダー。* / public static class AppListLoader extends AsyncTaskLoader> {final InterestingConfigChanges mLastConfig = new InterestingConfigChanges（）; 最終的なPackageManagermPm;

List<AppEntry> mApps;
PackageIntentReceiver mPackageObserver;

public AppListLoader(Context context) {
    super(context);

    // Retrieve the package manager for later use; note we don't
    // use 'context' directly but instead the save global application
    // context returned by getContext().
    mPm = getContext().getPackageManager();
}

/**
 * This is where the bulk of our work is done.  This function is
 * called in a background thread and should generate a new set of
 * data to be published by the loader.
 */
@Override public List<AppEntry> loadInBackground() {
    // Retrieve all known applications.
    List<ApplicationInfo> apps = mPm.getInstalledApplications(
            PackageManager.GET_UNINSTALLED_PACKAGES |
            PackageManager.GET_DISABLED_COMPONENTS);
    if (apps == null) {
        apps = new ArrayList<ApplicationInfo>();
    }

    final Context context = getContext();

    // Create corresponding array of entries and load their labels.
    List<AppEntry> entries = new ArrayList<AppEntry>(apps.size());
    for (int i=0; i<apps.size(); i++) {
        AppEntry entry = new AppEntry(this, apps.get(i));
        entry.loadLabel(context);
        entries.add(entry);
    }

    // Sort the list.
    Collections.sort(entries, ALPHA_COMPARATOR);

    // Done!
    return entries;
}

/**
 * Called when there is new data to deliver to the client.  The
 * super class will take care of delivering it; the implementation
 * here just adds a little more logic.
 */
@Override public void deliverResult(List<AppEntry> apps) {
    if (isReset()) {
        // An async query came in while the loader is stopped.  We
        // don't need the result.
        if (apps != null) {
            onReleaseResources(apps);
        }
    }
    List<AppEntry> oldApps = apps;
    mApps = apps;

    if (isStarted()) {
        // If the Loader is currently started, we can immediately
        // deliver its results.
        super.deliverResult(apps);
    }

    // At this point we can release the resources associated with
    // 'oldApps' if needed; now that the new result is delivered we
    // know that it is no longer in use.
    if (oldApps != null) {
        onReleaseResources(oldApps);
    }
}

/**
 * Handles a request to start the Loader.
 */
@Override protected void onStartLoading() {
    if (mApps != null) {
        // If we currently have a result available, deliver it
        // immediately.
        deliverResult(mApps);
    }

    // Start watching for changes in the app data.
    if (mPackageObserver == null) {
        mPackageObserver = new PackageIntentReceiver(this);
    }

    // Has something interesting in the configuration changed since we
    // last built the app list?
    boolean configChange = mLastConfig.applyNewConfig(getContext().getResources());

    if (takeContentChanged() || mApps == null || configChange) {
        // If the data has changed since the last time it was loaded
        // or is not currently available, start a load.
        forceLoad();
    }
}

/**
 * Handles a request to stop the Loader.
 */
@Override protected void onStopLoading() {
    // Attempt to cancel the current load task if possible.
    cancelLoad();
}

/**
 * Handles a request to cancel a load.
 */
@Override public void onCanceled(List<AppEntry> apps) {
    super.onCanceled(apps);

    // At this point we can release the resources associated with 'apps'
    // if needed.
    onReleaseResources(apps);
}

/**
 * Handles a request to completely reset the Loader.
 */
@Override protected void onReset() {
    super.onReset();

    // Ensure the loader is stopped
    onStopLoading();

    // At this point we can release the resources associated with 'apps'
    // if needed.
    if (mApps != null) {
        onReleaseResources(mApps);
        mApps = null;
    }

    // Stop monitoring for changes.
    if (mPackageObserver != null) {
        getContext().unregisterReceiver(mPackageObserver);
        mPackageObserver = null;
    }
}

/**
 * Helper function to take care of releasing resources associated
 * with an actively loaded data set.
 */
protected void onReleaseResources(List<AppEntry> apps) {
    // For a simple List<> there is nothing to do.  For something
    // like a Cursor, we would close it here.
} }

上記のローダーを使用して現在インストールされているアプリケーションをリストに表示するフラグメントの実装例を以下に示します。

public static class AppListAdapter extends ArrayAdapter {private final LayoutInflater mInflater;

public AppListAdapter(Context context) {
    super(context, android.R.layout.simple_list_item_2);
    mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

public void setData(List<AppEntry> data) {
    clear();
    if (data != null) {
        addAll(data);
    }
}

/**
 * Populate new items in the list.
 */
@Override public View getView(int position, View convertView, ViewGroup parent) {
    View view;

    if (convertView == null) {
        view = mInflater.inflate(R.layout.list_item_icon_text, parent, false);
    } else {
        view = convertView;
    }

    AppEntry item = getItem(position);
    ((ImageView)view.findViewById(R.id.icon)).setImageDrawable(item.getIcon());
    ((TextView)view.findViewById(R.id.text)).setText(item.getLabel());

    return view;
} }

public static class AppListFragment extends ListFragmentimplements OnQueryTextListener、LoaderManager.LoaderCallbacks> {

// This is the Adapter being used to display the list's data.
AppListAdapter mAdapter;

// If non-null, this is the current filter the user has provided.
String mCurFilter;

@Override public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    // Give some text to display if there is no data.  In a real
    // application this would come from a resource.
    setEmptyText("No applications");

    // We have a menu item to show in action bar.
    setHasOptionsMenu(true);

    // Create an empty adapter we will use to display the loaded data.
    mAdapter = new AppListAdapter(getActivity());
    setListAdapter(mAdapter);

    // Start out with a progress indicator.
    setListShown(false);

    // Prepare the loader.  Either re-connect with an existing one,
    // or start a new one.
    getLoaderManager().initLoader(0, null, this);
}

@Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    // Place an action bar item for searching.
    MenuItem item = menu.add("Search");
    item.setIcon(android.R.drawable.ic_menu_search);
    item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM
            | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW);
    SearchView sv = new SearchView(getActivity());
    sv.setOnQueryTextListener(this);
    item.setActionView(sv);
}

@Override public boolean onQueryTextChange(String newText) {
    // Called when the action bar search text has changed.  Since this
    // is a simple array adapter, we can just have it do the filtering.
    mCurFilter = !TextUtils.isEmpty(newText) ? newText : null;
    mAdapter.getFilter().filter(mCurFilter);
    return true;
}

@Override public boolean onQueryTextSubmit(String query) {
    // Don't care about this.
    return true;
}

@Override public void onListItemClick(ListView l, View v, int position, long id) {
    // Insert desired behavior here.
    Log.i("LoaderCustom", "Item clicked: " + id);
}

@Override public Loader<List<AppEntry>> onCreateLoader(int id, Bundle args) {
    // This is called when a new Loader needs to be created.  This
    // sample only has one Loader with no arguments, so it is simple.
    return new AppListLoader(getActivity());
}

@Override public void onLoadFinished(Loader<List<AppEntry>> loader, List<AppEntry> data) {
    // Set the new data in the adapter.
    mAdapter.setData(data);

    // The list should now be shown.
    if (isResumed()) {
        setListShown(true);
    } else {
        setListShownNoAnimation(true);
    }
}

@Override public void onLoaderReset(Loader<List<AppEntry>> loader) {
    // Clear the data in the adapter.
    mAdapter.setData(null);
} }
于 2012-10-07T20:05:31.160 に答える