google android 源码代码规范

以Activity源码总结android的命名规范，只能总结大概的规律，无法做到绝对的符合。

放置常量与变量的排位顺序

• 第一层放置顺序的规则:
  常量->变量->接口->内部类.
• 第二层,各个类型内部又区分为:
  静态static->非静态
• 第三层,最后的一个排位规则:访问权限
  private私有->包访问(前无修饰符)->protected->public

所以最后总结如下:

1. private static final int->String 私有常量String型
2. static final int->String 包与protected常访问权限常量
3. public static final int->String公共常量
4. private static int->String 私有静态变量
5. static int->String 包与protected常访问权限静态变量
6. public static int->String公共静态变量
7. private int->Stirng;普通私有变量
8. protect子类访问权限->public int&String 普通公共变量
9. 接口:private static ->普通接口
10. 内部类:private static ->普通内部类

常量&变量命令规则

• 以**static fina**l修饰的常量字母全都为大写，单词之间用_下划线隔开，如RESULT_CANCELED。
• 静态变量前用小写字母”s”表示，后接单词的首字母大写，如sActivity
• 除静态变量的其它所有变量前都用小写字母”m”表示，后接单词的首字母大写，如 private Window mWindow;
• 一般都是用类名前加”s”或者”m”来命名一个类对象变量

方法命名规则

• 采用小驼峰命名法，首单词小写，第二个单词首字母大写，如getActivityToken()
• 方法名的第一个字母一般都为动词
• 常用的get,set来表示取得与设置;save保存
• on用以当什么发生的时候，生命周期都是以on开头;
• requse**t请求，如请求权限;**add添加;enter进入
• open开启对话框之类;close关闭;cancle取消;show显示,dismiss隐藏
• start启动如activity;stop停止如stop service;init初始化
• 如果方法的返回值为boolean,一般命令为isMn()或者hasMn()
• 其它boolean值的返回动词有should,can

  private static final String TAG = "Activity";    private static final boolean DEBUG_LIFECYCLE = false;    /** Standard activity result: operation canceled. */    public static final int RESULT_CANCELED    = 0;    /** Standard activity result: operation succeeded. */    public static final int RESULT_OK           = -1;    /** Start of user-defined activity results. */    public static final int RESULT_FIRST_USER   = 1;    /** @hide Task isn't finished when activity is finished */    public static final int DONT_FINISH_TASK_WITH_ACTIVITY = 0;    /**     * @hide Task is finished if the finishing activity is the root of the task. To preserve the     * past behavior the task is also removed from recents.     */    public static final int FINISH_TASK_WITH_ROOT_ACTIVITY = 1;    /**     * @hide Task is finished along with the finishing activity, but it is not removed from     * recents.     */    public static final int FINISH_TASK_WITH_ACTIVITY = 2;    static final String FRAGMENTS_TAG = "android:fragments";    private static final String WINDOW_HIERARCHY_TAG = "android:viewHierarchyState";    private static final String SAVED_DIALOG_IDS_KEY = "android:savedDialogIds";    private static final String SAVED_DIALOGS_TAG = "android:savedDialogs";    private static final String SAVED_DIALOG_KEY_PREFIX = "android:dialog_";    private static final String SAVED_DIALOG_ARGS_KEY_PREFIX = "android:dialog_args_";    private static final String HAS_CURENT_PERMISSIONS_REQUEST_KEY =            "android:hasCurrentPermissionsRequest";    private static final String REQUEST_PERMISSIONS_WHO_PREFIX = "@android:requestPermissions:";    private static final String KEYBOARD_SHORTCUTS_RECEIVER_PKG_NAME = "com.android.systemui";    private static final String KEYBOARD_SHORTCUTS_RECEIVER_CLASS_NAME =            "com.android.systemui.statusbar.KeyboardShortcutsReceiver";    private static class ManagedDialog {        Dialog mDialog;        Bundle mArgs;    }    private SparseArray<ManagedDialog> mManagedDialogs;    // set by the thread after the constructor and before onCreate(Bundle savedInstanceState) is called.    private Instrumentation mInstrumentation;    private IBinder mToken;    private int mIdent;    /*package*/ String mEmbeddedID;    private Application mApplication;    /*package*/ Intent mIntent;    /*package*/ String mReferrer;    private ComponentName mComponent;    /*package*/ ActivityInfo mActivityInfo;    /*package*/ ActivityThread mMainThread;    Activity mParent;    boolean mCalled;    /*package*/ boolean mResumed;    /*package*/ boolean mStopped;    boolean mFinished;    boolean mStartedActivity;    private boolean mDestroyed;    private boolean mDoReportFullyDrawn = true;    /** true if the activity is going through a transient pause */    /*package*/ boolean mTemporaryPause = false;    /** true if the activity is being destroyed in order to recreate it with a new configuration */    /*package*/ boolean mChangingConfigurations = false;    /*package*/ int mConfigChangeFlags;    /*package*/ Configuration mCurrentConfig;    private SearchManager mSearchManager;    private MenuInflater mMenuInflater;    static final class NonConfigurationInstances {        Object activity;        HashMap<String, Object> children;        FragmentManagerNonConfig fragments;        ArrayMap<String, LoaderManager> loaders;        VoiceInteractor voiceInteractor;    }    /* package */ NonConfigurationInstances mLastNonConfigurationInstances;    private Window mWindow;    private WindowManager mWindowManager;    /*package*/ View mDecor = null;    /*package*/ boolean mWindowAdded = false;    /*package*/ boolean mVisibleFromServer = false;    /*package*/ boolean mVisibleFromClient = true;    /*package*/ ActionBar mActionBar = null;    private boolean mEnableDefaultActionBarUp;    private VoiceInteractor mVoiceInteractor;    private CharSequence mTitle;    private int mTitleColor = 0;    // we must have a handler before the FragmentController is constructed    final Handler mHandler = new Handler();    final FragmentController mFragments = FragmentController.createController(new HostCallbacks());    // Most recent call to requestVisibleBehind().    boolean mVisibleBehind;    private static final class ManagedCursor {        ManagedCursor(Cursor cursor) {            mCursor = cursor;            mReleased = false;            mUpdated = false;        }        private final Cursor mCursor;        private boolean mReleased;        private boolean mUpdated;    }    private final ArrayList<ManagedCursor> mManagedCursors =        new ArrayList<ManagedCursor>();    // protected by synchronized (this)    int mResultCode = RESULT_CANCELED;    Intent mResultData = null;    private TranslucentConversionListener mTranslucentCallback;    private boolean mChangeCanvasToTranslucent;    private SearchEvent mSearchEvent;    private boolean mTitleReady = false;    private int mActionModeTypeStarting = ActionMode.TYPE_PRIMARY;    private int mDefaultKeyMode = DEFAULT_KEYS_DISABLE;    private SpannableStringBuilder mDefaultKeySsb = null;    private ActivityManager.TaskDescription mTaskDescription =            new ActivityManager.TaskDescription();    protected static final int[] FOCUSED_STATE_SET = {com.android.internal.R.attr.state_focused};    @SuppressWarnings("unused")    private final Object mInstanceTracker = StrictMode.trackActivity(this);    private Thread mUiThread;    ActivityTransitionState mActivityTransitionState = new ActivityTransitionState();    SharedElementCallback mEnterTransitionListener = SharedElementCallback.NULL_CALLBACK;    SharedElementCallback mExitTransitionListener = SharedElementCallback.NULL_CALLBACK;    private boolean mHasCurrentPermissionsRequest;    private boolean mEatKeyUpEvent;    private static native String getDlWarning();