Android开发6：日志信息输出

Android开发
System.out.println();用这条语句是不能将信息打印到控制台的。

需要用到Log
android.util.Log

windows ==> Preferences ==> Android ==> DDMS ==> Logging Level

设置日志级别，选中之下的将被显示，选中之上的不被显示。

windows ==> Show View ==> Android ==> LogCat

显示LogCat栏目。

Constants

int
ASSERT
Priority constant for the println method.

int
DEBUG
Priority constant for the println method; use Log.d.

int
ERROR
Priority constant for the println method; use Log.e.

int
INFO
Priority constant for the println method; use Log.i.

int
VERBOSE
Priority constant for the println method; use Log.v.

int
WARN
Priority constant for the println method; use Log.w.

private static final String TAG = "MyActivity";

and use that in subsequent calls to the log methods.

Tip: Don't forget that when you make a call like

Log.v(TAG, "index=" + i);

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