Android 框架简介

entify the source of a log message. It usually identifies

* the class or activity where the log call occurs.

* @param msg The message you would like logged.

* @param tr An exception to log

*/

public static int w(String tag, String msg, Throwable tr) {

return println_native(LOG_ID_MAIN, WARN, tag, msg + '/n' + getStackTraceString(tr));

}

/**

* Checks to see whether or not a log for the specified tag is loggable at the specified level.

*

* The default level of any tag is set to INFO. This means that any level above and including

* INFO will be logged. Before you make any calls to a logging method you should check to see

* if your tag should be logged. You can change the default level by setting a system property:

* 'setprop log.tag. '

* Where level is either VERBOSE, DEBUG, INFO, WARN, ERROR, ASSERT, or SUPPRESS. SUPPRESS will

* turn off all logging for your tag. You can also create a local.prop file that with the

* following in it:

* 'log.tag.='

* and place that in /data/local.prop.

*

* @param tag The tag to check.

* @param level The level to check.

* @return Whether or not that this is allowed to be logged.

* @throws IllegalArgumentException is thrown if the tag.length() > 23.

*/

public static native boolean isLoggable(String tag, int level);

/**

* Send a {@link #WARN} log message and log the exception.

* @param tag Used to identify the source of a log message. It usually identifies

* the class or activity where the log call occurs.

* @param tr An exception to log

*/

public static int w(String tag, Throwable tr) {

return println_native(LOG_ID_MAIN, WARN, tag, getStackTraceString(tr));

}

/**

* Send an {@link #ERROR} log message.

* @param tag Used to identify the source of a log message. It usually identifies

* the class or activity where the log call occurs.

* @param msg The message you would like logged.

*/

public static int e(String tag, String msg) {

return println_native(LOG_ID_MAIN, ERROR, tag, msg);

}

/**

* Send a {@link #ERROR} log message and log the exception.

* @param tag Used to identify the source of a log message. It usually identifies

* the class or activity where the log call occurs.

* @param msg The message you would like logged.

* @param tr An exception to log

*/

public static int e(String tag, String msg, Throwable tr) {

return println_native(LOG_ID_MAIN, ERROR, tag, msg + '/n' + getStackTraceString(tr));

}

/**

* What a Terrible Failure: Report a condition that should never happen.

* The error will always be logged at level ASSERT with the call stack.

* Depending on system configuration, a report may be added to the

* {@link Android.os.DropBoxManager} and/or the process may be terminated

* immediately with an error dialog.

* @param tag Used to identify the source of a log message.

* @param msg The message you would like logged.

*/

public static int wtf(String tag, String msg) {

return wtf(tag, msg, null);

}

/**

* What a Terrible Failure: Report an exception that should never happen.

* Similar to {@link #wtf(String, String)}, with an exception to log.

* @param tag Used to identify the source of a log message.

* @param tr An exception to log.

*/

public static int wtf(String tag, Throwable tr) {

return wtf(tag, tr.getMessage(), tr);

}

/**

* What a Terrible Failure: Report an exception that should never happen.

* Similar to {@link #wtf(String, Throwable)}, with a message as well.

* @param tag Used to identify the source of a log message.

* @param msg The message you would like logged.

* @param tr An exception to log. May be null.

*/

public static int wtf(String tag, String msg, Throwable tr) {

tr = new TerribleFailure(msg, tr);

int bytes = println_native(LOG_I