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Original Link: http://www.cnblogs.com/riasky/p/3483500.html stay Smart TV TV Development - Communication between Client and Server Inside, we achieve simple communication between client and server. Next, we make a simple client interfac ...

I. File Storage Without any formatting of the stored content, it is suitable for storing simple text data or binary data. 1. Store 5 pieces of music: Gets the FileOutputStream object, which is obtained through the openFileOutput() method provided by the Context class Get the OutputStreamWriter object, and pass in the FileOutputStream object ...

1. Handle layout file: activity_main.xml: Create a simple ListView to hold contact data <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="ma ...

Reprint the original address: http://www.cnblogs.com/liqw/p/4264925.html Android uses the SQLite database to store data, so what about database version upgrade? 1. Software v1.0 Install v1.0, assuming v1.0 has only one account table, then go on Create inheriting from SQLiteOpenHelper instead of onUpgrade. 1. v1.0 (install v1.0 directly) 2 ...

Reprint address: http://blog.csdn.net/u010961631/article/details/14227421 I. Preface ContentProvider, as one of the four components of Android, plays the role of data storage. This paper uses the most typical delete operation, according to Android source code, starting from the application layer getContentResolver(), step by step analys ...

Copyright Statement: This is an original article created by a blogger and may not be reproduced without the permission of the blogger.When downloading videos, we often face the choice of storage path. Choosing a good storage path can optimize the memory in the Android system.The main app download path analysis and common path selection schemes ...

cover LiveData Problems LiveData can solve 1 Loading pages or other ways to trigger the request server to get data Successful acquisition of desired data from the server requires rendering to the interface Whether we need to implement step 2 manually or cumbersome is LiveData's point of pain. Definition of LiveData LiveData ...

In the actual development, it is often unavoidable to operate the database on the interface. For example, to develop a shopping cart, we need to display the goods in the shopping cart in the form of a list, and we also need to add, delete and check the goods in the shopping cart. To achieve these functions, you need to use ListView and SQLLite ...

Debugging environment: ubuntu 16.04 Android sdk 7.1.1 / platform-tools sqlite3 (1) Creating database files Instead of creating db files manually, execute them directly from the command line: ~/test_sqlite$ sqlite3 test.db Go to the SQLIte command line and build tables directly using standard SQL: sqlite> create table test ...

Previously, we introduced the preliminary learning of SQLite, learned how to build tables, and how to add, delete and modify the contents of tables. This article will study SQLite in depth. SQLite constraints Since I began to learn the basic knowledge of Oracle database, I have some preliminary understanding of constraints. Constraints are ...