一、Android原生android.util.Log類

Android原生的Log類是http://androidxref.com/9.0.0_r3/xref/frameworks/base/core/java/android/util/Log.java#144

最終會調用native方法，傳遞的參數有：bufID(對應不同的MAIN/RADIO/EVENTS/SYSTEM/CRASH buffer), priority(VERBOSE < DEBUG < INFO < WARN < ERROR, 默認大于等于INFO的log會被打印出來，其它等級的log可以通過log.tag.LOG_TAG = VERBOSE等方法打開)

144 public static int d(String tag, String msg) { 145 return println_native(LOG_ID_MAIN, DEBUG, tag, msg); 146 }373 /** @hide */ public static native int println_native(int bufID, 374 int priority, String tag, String msg);

我們可以通過如下兩種方式使用：

• import導包+調用Log.d

http://androidxref.com/9.0.0_r3/xref/packages/services/Car/tests/DefaultStorageMonitoringCompanionApp/src/com/google/android/car/defaultstoragemonitoringcompanionapp/ExcessiveIoIntentReceiver.java

7import android.util.Log;15 Log.d(TAG, "excessive I/O activity detected.");

• 直接使用android.util.Log.i

http://androidxref.com/9.0.0_r3/xref/packages/apps/Browser2/src/org/chromium/webview_shell/StartupTimeActivity.java#27

27 android.util.Log.i("WebViewShell", "WebViewStartupTimeMillis=" + (t2 - t1));

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二、TeleService,Telecom,Dialer里的自定義Log

1. TeleService

不導包，直接默認會調用同包下的Log(TeleService - > framework)：

android.services.telephony.Log#d -> android.telecom.Log#d

其間，會調用到原生的Log#isLoggable判斷Log的等級情況（方法見上）

http://androidxref.com/9.0.0_r3/xref/packages/services/Telephony/src/com/android/services/telephony/TelephonyConnection.java

105 Log.v(TelephonyConnection.this, "MSG_PRECISE_CALL_STATE_CHANGED");

http://androidxref.com/9.0.0_r3/xref/packages/services/Telephony/src/com/android/services/telephony/Log.java#24

51 public static void d(String prefix, String format, Object... args) { 52 android.telecom.Log.d(prefix, format, args); 53 }

http://androidxref.com/9.0.0_r3/xref/frameworks/base/telecomm/java/android/telecom/Log.java#80

51 public static String TAG = "TelecomFramework"; 52 public static boolean DEBUG = isLoggable(android.util.Log.DEBUG); 53 public static boolean INFO = isLoggable(android.util.Log.INFO); 54 public static boolean VERBOSE = isLoggable(android.util.Log.VERBOSE); 55 public static boolean WARN = isLoggable(android.util.Log.WARN); 56 public static boolean ERROR = isLoggable(android.util.Log.ERROR);80 public static void d(String prefix, String format, Object... args) { 81 if (sIsUserExtendedLoggingEnabled) { 82 maybeDisableLogging(); 83 android.util.Slog.i(TAG, buildMessage(prefix, format, args)); 84 } else if (DEBUG) { 85 android.util.Slog.d(TAG, buildMessage(prefix, format, args)); 86 } 87 }367 public static boolean isLoggable(int level) { 368 return FORCE_LOGGING || android.util.Log.isLoggable(TAG, level); 369 }

【注意】

如果在TelephonyConnection里使用原生的Log類，要小心導包和調用Log方法兩兩配合使用，否則會出現異常。

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2. Telecom

導包

http://androidxref.com/9.0.0_r3/xref/packages/services/Telecomm/src/com/android/server/telecom/CallsManager.java#47

47import android.telecom.Log;488 Log.v(this, "onSuccessfulOutgoingCall, %s", call);

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3. Dialer

同TeleService, 如果不聲明導包，默認使用同包下的http://androidxref.com/9.0.0_r3/xref/packages/apps/Dialer/java/com/android/incallui/Log.java

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總結

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