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我创建了一个简单的android应用程序,并在我的mainActivity中添加了以下内容,我可以在模拟器中运行该应用程序,但只是Device断开连接的错误会显示在Logcat上。System.err不会在Logcat和控制台上显示任何内容
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SqliteHelper db = new SqliteHelper(this,null);
/**
* CRUD Operations
* */
// add Books
db.addBook(new Book("Android Application Development Cookbook"));
db.addBook(new Book("Android Programming: The Big Nerd Ranch Guide"));
db.addBook(new Book("Learn Android App Development"));
System.err.println("Adding records to DB!");
Book book = db.getBook(1);
System.err.println(">>" + book);
Log.v(ALARM_SERVICE, book.getName());
setContentView(R.layout.activity_main);
}