生成TAG
logt+Tab键:
private static final String TAG = "Extract";
生成Log.d()
logd+Tab键:
Log.d(TAG, "onCreate: ");
生成Log.e()
loge+Tab键:
Log.e(TAG, "onCreate: ",new Throwable());
生成Log.i/w类似
Log.i(TAG, "onCreate: ");
Log.w(TAG, "onCreate: ", );
logm+Tab:打印参数
Log.d(TAG, "onCreate() called with: savedInstanceState = [" + savedInstanceState + "]");
logr+Tab:打印返回值
Log.d(TAG, "onCreate() returned: " + );
查看日志输出
在Android Studio Logcat选项卡,中可以选择过滤的级别,来过滤日志输出,比如Verbose、Debug、Error等,上面的选项(如Debug)会包含下面选项(如Error)的日志
![](https://img.laitimes.com/img/__Qf2AjLwojIjJCLyojI0JCLiAzNfRHLGZkRGZkRfJ3bs92YsYTMfVmepNHL1UERNp3aU1ENJpHW4Z0MMBjVtJWd0ckW65UbM5WOHJWa5kHT20ESjBjUIF2X0hXZ0xCMx81dvRWYoNHLrdEZwZ1Rh5WNXp1bwNjW1ZUba9VZwlHdssmch1mclRXY39CXldWYtlWPzNXZj9mcw1ycz9WL49zZuBnLyUDN0EDN0IjM2AjNwkTMwIzLc52YucWbp5GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.png)