android中调试之日志

开始利用零碎时间做android开发了，android中android.util.Log到底怎么要用呢？跟Java中的日志有什么区别呢？首先看下Log的源码

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;....................................}

发现他共有6种级别，数字大的代表级别高，在代码中可以通过直接写日志的方式在logcat中查看，

5个常用的为：Log.v() ,Log.d() ,Log.i() ,Log.w(),Log.e()

同时在记录日志的时候注意Log中的一个方法，看源码

   /**     * 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.&lt;YOUR_LOG_TAG> &lt;LEVEL>'     *  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.&lt;YOUR_LOG_TAG>=&lt;LEVEL>'     *  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);

具体的使用看doc

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