In launcher, long press the screen and the figure goes down. Let's find it in the Code:
First, find the onlongclick (view v) method, and then in this method, there is the following code:
if (mWorkspace.allowLongPress()) { if (cellInfo.cell == null) { if (cellInfo.valid) { // User long pressed on empty space mWorkspace.setAllowLongPress(false); showAddDialog(cellInfo); } } else { if (!(cellInfo.cell instanceof Folder)) { // User long pressed on an item mWorkspace.startDrag(cellInfo); } } }
Then, continue tracing the showadddialog () method:
private void showAddDialog(CellLayout.CellInfo cellInfo) { mAddItemCellInfo = cellInfo; mWaitingForResult = true; showDialog(DIALOG_CREATE_SHORTCUT); }
Continue to find showdialog. Nothing is found. The showdialog () method is the class parent class activity () method that carries the dialog_create_shortcut parameter, but it is the called launcher. java oncreatedialog (int id) method:
@Override protected Dialog onCreateDialog(int id) { switch (id) { case DIALOG_CREATE_SHORTCUT: return new CreateShortcut().createDialog();
Here, the createshortcut. createdialog () method is used, in the 2708 line of the source code:
Private class createshortcut implements dialoginterface. onclicklistener, DialogInterface.OnCancelListener, DialogInterface.OnDismissListener, DialogInterface.OnShowListener { private AddAdapter mAdapter; Dialog createDialog() { mWaitingForResult = true; mAdapter = new AddAdapter(Launcher.this); final AlertDialog.Builder builder = new AlertDialog.Builder(Launcher.this); builder.setTitle(getString(R.string.menu_item_add_item)); builder.setAdapter(mAdapter, this); builder.setInverseBackgroundForced(true); AlertDialog dialog = builder.create(); dialog.setOnCancelListener(this); dialog.setOnDismissListener(this); dialog.setOnShowListener(this); return dialog; } public void onCancel(DialogInterface dialog) { mWaitingForResult = false; cleanup(); } public void onDismiss(DialogInterface dialog) { mWorkspace.unlock(); } private void cleanup() { mWorkspace.unlock(); dismissDialog(DIALOG_CREATE_SHORTCUT); } /** * Handle the action clicked in the "Add to home" dialog. */ public void onClick(DialogInterface dialog, int which) { Resources res = getResources(); cleanup(); switch (which) { case AddAdapter.ITEM_SHORTCUT: { // Insert extra item to handle picking application pickShortcut(REQUEST_PICK_SHORTCUT, R.string.title_select_shortcut); break; } case AddAdapter.ITEM_APPWIDGET: { int appWidgetId = Launcher.this.mAppWidgetHost.allocateAppWidgetId(); Intent pickIntent = new Intent(AppWidgetManager.ACTION_APPWIDGET_PICK); pickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId); // add the search widget ArrayList<AppWidgetProviderInfo> customInfo = new ArrayList<AppWidgetProviderInfo>(); AppWidgetProviderInfo info = new AppWidgetProviderInfo(); info.provider = new ComponentName(getPackageName(), "XXX.YYY"); info.label = getString(R.string.group_search); info.icon = R.drawable.ic_search_widget; customInfo.add(info); pickIntent.putParcelableArrayListExtra( AppWidgetManager.EXTRA_CUSTOM_INFO, customInfo); ArrayList<Bundle> customExtras = new ArrayList<Bundle>(); Bundle b = new Bundle(); b.putString(EXTRA_CUSTOM_WIDGET, SEARCH_WIDGET); customExtras.add(b); pickIntent.putParcelableArrayListExtra( AppWidgetManager.EXTRA_CUSTOM_EXTRAS, customExtras); // start the pick activity startActivityForResult(pickIntent, REQUEST_PICK_APPWIDGET); break; } case AddAdapter.ITEM_LIVE_FOLDER: { // Insert extra item to handle inserting folder Bundle bundle = new Bundle(); ArrayList<String> shortcutNames = new ArrayList<String>(); shortcutNames.add(res.getString(R.string.group_folder)); bundle.putStringArrayList(Intent.EXTRA_SHORTCUT_NAME, shortcutNames); ArrayList<ShortcutIconResource> shortcutIcons = new ArrayList<ShortcutIconResource>(); shortcutIcons.add(ShortcutIconResource.fromContext(Launcher.this, R.drawable.ic_launcher_folder)); bundle.putParcelableArrayList(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, shortcutIcons); Intent pickIntent = new Intent(Intent.ACTION_PICK_ACTIVITY); pickIntent.putExtra(Intent.EXTRA_INTENT, new Intent(LiveFolders.ACTION_CREATE_LIVE_FOLDER)); pickIntent.putExtra(Intent.EXTRA_TITLE, getText(R.string.title_select_live_folder)); pickIntent.putExtras(bundle); startActivityForResult(pickIntent, REQUEST_PICK_LIVE_FOLDER); break; } case AddAdapter.ITEM_WALLPAPER: { startWallpaper(); break; } case AddAdapter.ITEM_ANYCUT: { Intent anycutIntent=new Intent(); anycutIntent.setClass(Launcher.this, CustomShirtcutActivity.class); startActivityForResult(anycutIntent, REQUEST_PICK_ANYCUT); break; } } } public void onShow(DialogInterface dialog) { mWorkspace.lock(); } }
We can find the code in the onclick () method in the createshortcut class (here the code is 2.2 ):
case AddAdapter.ITEM_APPWIDGET: { int appWidgetId = Launcher.this.mAppWidgetHost.allocateAppWidgetId(); Intent pickIntent = new Intent(AppWidgetManager.ACTION_APPWIDGET_PICK); pickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId); // add the search widget ArrayList<AppWidgetProviderInfo> customInfo = new ArrayList<AppWidgetProviderInfo>(); AppWidgetProviderInfo info = new AppWidgetProviderInfo(); info.provider = new ComponentName(getPackageName(), "XXX.YYY"); info.label = getString(R.string.group_search); info.icon = R.drawable.ic_search_widget; customInfo.add(info); pickIntent.putParcelableArrayListExtra( AppWidgetManager.EXTRA_CUSTOM_INFO, customInfo); ArrayList<Bundle> customExtras = new ArrayList<Bundle>(); Bundle b = new Bundle(); b.putString(EXTRA_CUSTOM_WIDGET, SEARCH_WIDGET); customExtras.add(b); pickIntent.putParcelableArrayListExtra( AppWidgetManager.EXTRA_CUSTOM_EXTRAS, customExtras); // start the pick activity startActivityForResult(pickIntent, REQUEST_PICK_APPWIDGET); break; }
Here is the 2.3 code:case AddAdapter.ITEM_APPWIDGET: { int appWidgetId = Launcher.this.mAppWidgetHost.allocateAppWidgetId(); Intent pickIntent = new Intent(AppWidgetManager.ACTION_APPWIDGET_PICK); pickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId); // start the pick activity startActivityForResult(pickIntent, REQUEST_PICK_APPWIDGET); break; }
How is this implemented? I have seen the startactivityforresult () method. It actually runs package/apps/settings/src/COM/Android/settings/appwidgetpickactivity. java:
void putAppWidgetItems(List<AppWidgetProviderInfo> appWidgets, List<Bundle> customExtras, List<PickAdapter.Item> items) { if (appWidgets == null) return; final int size = appWidgets.size(); for (int i = 0; i < size; i++) { AppWidgetProviderInfo info = appWidgets.get(i); Drawable icon = null; CharSequence label = info.label; if (info.icon != 0) { icon = mPackageManager.getDrawable(info.provider.getPackageName(), info.icon, null); if (icon == null) { Log.w(TAG, "Can't load icon drawable 0x" + Integer.toHexString(info.icon) + " for provider: " + info.provider); } } PickAdapter.Item item = new PickAdapter.Item(this, label, icon); item.packageName = info.provider.getPackageName(); item.className = info.provider.getClassName(); if (customExtras != null) { item.extras = customExtras.get(i); } items.add(item); }
And method:@Override protected List<PickAdapter.Item> getItems() { List<PickAdapter.Item> items = new ArrayList<PickAdapter.Item>(); putInstalledAppWidgets(items); putCustomAppWidgets(items); // Sort all items together by label Collections.sort(items, new Comparator<PickAdapter.Item>() { Collator mCollator = Collator.getInstance(); public int compare(PickAdapter.Item lhs, PickAdapter.Item rhs) { return mCollator.compare(lhs.label, rhs.label); } }); return items; }
Below is my own widget acquisition icon:List<AppWidgetProviderInfo> mAppinfoList = mAppWidgetManager.getInstalledProviders(); List<Drawable> mIconList=new ArrayList(); for(AppWidgetProviderInfo appWidgetInfo:mAppinfoList) { Drawable icon = null; PackageManager packageManager = getPackageManager(); icon = packageManager.getDrawable(appWidgetInfo.provider.getPackageName(), appWidgetInfo.icon, null); mIconList.add(icon); }
In this code, you can obtain the widget list. If you do not know why, use the following code:
List<AppWidgetProviderInfo> mAppinfoList = mAppWidgetManager.getInstalledProviders();for(AppWidgetProviderInfo appWidgetInfo:mAppinfoList) { mThumbs.add(appWidgetInfo.icon); }
However, you cannot obtain the widget icon. Instead, you can view other widgets.