android的快捷方式——应用程序界面

1.系统应用程序界面

获取系统程序ApplicationInfo集合

private void loadApplications(boolean isLaunching) {if (isLaunching && mApplications != null) {return;}PackageManager manager = getPackageManager();Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);final List<ResolveInfo> apps = manager.queryIntentActivities(mainIntent, 0);Collections.sort(apps, new ResolveInfo.DisplayNameComparator(manager));if (apps != null) {final int count = apps.size();if (mApplications == null) {mApplications = new ArrayList<ApplicationInfo>(count);}mApplications.clear();for (int i = 0; i < count; i++) {ApplicationInfo application = new ApplicationInfo();ResolveInfo info = apps.get(i);application.title = info.loadLabel(manager);application.setActivity(new ComponentName(info.activityInfo.applicationInfo.packageName,info.activityInfo.name), Intent.FLAG_ACTIVITY_NEW_TASK| Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);application.icon = info.activityInfo.loadIcon(manager);mApplications.add(application);}}}

程序列表构造器

private class ApplicationsAdapter extends ArrayAdapter<ApplicationInfo> {  private Rect mOldBounds = new Rect();  public ApplicationsAdapter(Context context, ArrayList<ApplicationInfo> apps) {   super(context, 0, apps);  }  @Override  public View getView(int position, View convertView, ViewGroup parent) {   final ApplicationInfo info = mApplications.get(position);   if (convertView == null) {    final LayoutInflater inflater = getLayoutInflater();    convertView = inflater.inflate(R.layout.application, parent, false);   }   Drawable icon = info.icon;   if (!info.filtered) {       int width = 42;// (int)       int height = 42;// (int)    final int iconWidth = icon.getIntrinsicWidth();    final int iconHeight = icon.getIntrinsicHeight();    if (icon instanceof PaintDrawable) {     PaintDrawable painter = (PaintDrawable) icon;     painter.setIntrinsicWidth(width);     painter.setIntrinsicHeight(height);    }    if (width > 0 && height > 0 && (width < iconWidth || height < iconHeight)) {     final float ratio = (float) iconWidth / iconHeight;     if (iconWidth > iconHeight) {      height = (int) (width / ratio);     } else if (iconHeight > iconWidth) {      width = (int) (height * ratio);     }     final Bitmap.Config c = icon.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888       : Bitmap.Config.RGB_565;     final Bitmap thumb = Bitmap.createBitmap(width, height, c);     final Canvas canvas = new Canvas(thumb);     canvas.setDrawFilter(new PaintFlagsDrawFilter(Paint.DITHER_FLAG, 0));     mOldBounds.set(icon.getBounds());     icon.setBounds(0, 0, width, height);     icon.draw(canvas);     icon.setBounds(mOldBounds);     icon = info.icon = new BitmapDrawable(thumb);     info.filtered = true;    }   }   final TextView textView = (TextView) convertView.findViewById(R.id.label);   textView.setTextColor(Color.BLACK);   if (color != null && color.length() == 10) {    int col_int = ByteHelper.string2color(color);    textView.setTextColor(col_int);   }else {    textView.setTextColor(Color.BLUE);   }   textView.setCompoundDrawablesWithIntrinsicBounds(null, icon, null, null);   textView.setText(info.title);   return convertView;  } }

添加构造，并设置监听

  mGrid.setAdapter(new ApplicationsAdapter(Home_activity.this, mApplications));mGrid.setSelection(0);mGrid.setOnItemClickListener(new ApplicationLauncher());

监听

private class ApplicationLauncher implements AdapterView.OnItemClickListener {public void onItemClick(AdapterView parent, View v, int position, long id) {ApplicationInfo app = (ApplicationInfo) parent.getItemAtPosition(position);startActivity(app.intent);}}

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