Android 框架简介

ion and copy, and even more pressure on the gc.

* That means that if your log message is filtered out, you might be doing

* significant work and incurring significant overhead.

*/

public final class Log {

/**

* Priority constant for the println method; use Log.v.

*/

public static final int VERBOSE = 2;

/**

* Priority constant for the println method; use Log.d.

*/

public static final int DEBUG = 3;

/**

* Priority constant for the println method; use Log.i.

*/

public static final int INFO = 4;

/**

* Priority constant for the println method; use Log.w.

*/

public static final int WARN = 5;

/**

* Priority constant for the println method; use Log.e.

*/

public static final int ERROR = 6;

/**

* Priority constant for the println method.

*/

public static final int ASSERT = 7;

/**

* Exception class used to capture a stack trace in {@link #wtf()}.

*/

private static class TerribleFailure extends Exception {

TerribleFailure(String msg, Throwable cause) { super(msg, cause); }

}

private Log() {

}

/**

* Send a {@link #VERBOSE} 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 v(String tag, String msg) {

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

}

/**

* Send a {@link #VERBOSE} 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 v(String tag, String msg, Throwable tr) {

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

}

/**

* Send a {@link #DEBUG} 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 d(String tag, String msg) {

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

}

/**

* Send a {@link #DEBUG} 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 d(String tag, String msg, Throwable tr) {

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

}

/**

* Send an {@link #INFO} 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 i(String tag, String msg) {

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

}

/**

* Send a {@link #INFO} 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 i(String tag, String msg, Throwable tr) {

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

}

/**

* Send a {@link #WARN} 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 w(String tag, String msg) {

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

}

/**

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

* @param tag Used to id