Java tutorial
//package com.java2s; /* * Copyright 2015 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. */ import android.content.ContentResolver; import android.database.Cursor; import android.media.tv.TvContract; import android.net.Uri; public class Main { public static int getChannelCount(ContentResolver resolver, String inputId) { Uri uri = TvContract.buildChannelsUriForInput(inputId); String[] projection = { TvContract.Channels._ID }; Cursor cursor = null; try { cursor = resolver.query(uri, projection, null, null, null); if (cursor != null) { return cursor.getCount(); } } finally { if (cursor != null) { cursor.close(); } } return 0; } }