生成TAG
logt+Tab鍵:
private static final String TAG = "Extract";
生成Log.d()
logd+Tab鍵:
Log.d(TAG, "onCreate: ");
生成Log.e()
loge+Tab鍵:
Log.e(TAG, "onCreate: ",new Throwable());
生成Log.i/w類似
Log.i(TAG, "onCreate: ");
Log.w(TAG, "onCreate: ", );
logm+Tab:列印參數
Log.d(TAG, "onCreate() called with: savedInstanceState = [" + savedInstanceState + "]");
logr+Tab:列印傳回值
Log.d(TAG, "onCreate() returned: " + );
檢視日志輸出
在Android Studio Logcat頁籤,中可以選擇過濾的級别,來過濾日志輸出,比如Verbose、Debug、Error等,上面的選項(如Debug)會包含下面選項(如Error)的日志