PS：假設閱讀體驗不好，能夠嘗試Github版 （<-點左邊）

1. setColor(-16777216)

反編譯的代碼中會有非常多setColor(int)的情況，比方setColor(-16777216)，這個值比較特別，能輕易的查到Android文檔中對這個整數的定義：

public static final int BLACK.
Added in API level 1
Constant Value: -16777216 ( 0xff000000).

也就是說setColor(-16777216)中-16777216相應的顏色是BLACK(0xff000000)，那么其它系統沒有定義成某個顏色名的值呢？

-16777216 相應 0xff000000-1 相應 0xffffffff0xffffff 的值 16777215那么對隨意的 setColor(int)中的int值，我們能夠： 0xffffffff+(int)+1 或 0xffffffff-(-int+1) 則對于 ：setColor(-16777216) 可寫成 ：setColor(0xffffffff - 16777215)) 或 setColor(-16777216 + 1 + 0xffffffff))這樣，我們就不用查文檔尋找特定的顏色值。也能解決隨意顏色的設置。

Stackoverflow : How to set color using integer?

2.MeasureSpec.makeMeasureSpec(xx, int)

反編譯的代碼中MeasureSpec.makeMeasureSpec(xx, int)的第二個參數是個int類型的數，這個比較簡單，直接看文檔或者源代碼就可以找到：

源代碼：

public static class MeasureSpec {public static final int UNSPECIFIED = 0;public static final int EXACTLY = 1073741824;public static final int AT_MOST = -2147483648;...}

文檔：

public static final int AT_MOST Added in API level 1 Measure specification mode: The child can be as large as it wants up to the specified size. Constant Value: -2147483648 (0x80000000)public static final int EXACTLY Added in API level 1 Measure specification mode: The parent has determined an exact size for the child. The child is going to be given those bounds regardless of how big it wants to be. Constant Value: 1073741824 (0x40000000)public static final int UNSPECIFIED Added in API level 1 Measure specification mode: The parent has not imposed any constraint on the child. It can be whatever size it wants. Constant Value: 0 (0x00000000)

則對于：
MeasureSpec.makeMeasureSpec(xx, 0)
我們應該改動為
MeasureSpec.makeMeasureSpec(xx, View.MeasureSpec.UNSPECIFIED)

其它依次類推。

3.setVisibility(int)

這個同[2],看文檔或者看源代碼：

public static final int VISIBLE = 0; public static final int INVISIBLE = 4; public static final int GONE = 8;

則對于：setVisibility(0) ==> setVisibility(View.VISIBLE)

其它依次類推。

4.new Runnable()...

反編譯的代碼中：

new Runnable() {final /* synthetic */ AbstractButton a;{this.a = r1;}public final void run() {this.a.xxxxx();} };

可直接去掉成員變量：

new Runnable() {public final void run() {xxxxx();} };

5.new Handler()...

同[4],直接去掉成員變量:

new Handler() {final /* synthetic */ ButtonSave a;{this.a = r1;}public final void handleMessage(Message message) {this.a.xxx();}}; //改動為 new Handler() {public final void handleMessage(Message message) {xxx();}};

6.context.getSystemService("layout_inflater")

直接看源代碼就可以：

public static final String POWER_SERVICE = "power"; public static final String WINDOW_SERVICE = "window"; public static final String LAYOUT_INFLATER_SERVICE = "layout_inflater"; public static final String ACCOUNT_SERVICE = "account"; public static final String ACTIVITY_SERVICE = "activity"; public static final String ALARM_SERVICE = "alarm"; public static final String NOTIFICATION_SERVICE = "notification"; public static final String ACCESSIBILITY_SERVICE = "accessibility"; ...

則context.getSystemService("layout_inflater") ==> context.getSystemService(Context.LAYOUT_INFLATER_SERVICE)

其它依次類推。

7.intent.setFlags(335544320)

先看源代碼：

Intent implements Parcelable, Cloneable {public static final int FLAG_GRANT_READ_URI_PERMISSION = 1;public static final int FLAG_GRANT_WRITE_URI_PERMISSION = 2;public static final int FLAG_FROM_BACKGROUND = 4;public static final int FLAG_DEBUG_LOG_RESOLUTION = 8;public static final int FLAG_EXCLUDE_STOPPED_PACKAGES = 16;public static final int FLAG_INCLUDE_STOPPED_PACKAGES = 32;public static final int FLAG_ACTIVITY_NO_HISTORY = 1073741824;public static final int FLAG_ACTIVITY_SINGLE_TOP = 536870912;public static final int FLAG_ACTIVITY_NEW_TASK = 268435456;public static final int FLAG_ACTIVITY_MULTIPLE_TASK = 134217728;public static final int FLAG_ACTIVITY_CLEAR_TOP = 67108864;public static final int FLAG_ACTIVITY_FORWARD_RESULT = 33554432;public static final int FLAG_ACTIVITY_PREVIOUS_IS_TOP = 16777216;public static final int FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS = 8388608;public static final int FLAG_ACTIVITY_BROUGHT_TO_FRONT = 4194304;public static final int FLAG_ACTIVITY_RESET_TASK_IF_NEEDED = 2097152;public static final int FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY = 1048576;public static final int FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET = 524288;public static final int FLAG_ACTIVITY_NO_USER_ACTION = 262144;public static final int FLAG_ACTIVITY_REORDER_TO_FRONT = 131072;public static final int FLAG_ACTIVITY_NO_ANIMATION = 65536;public static final int FLAG_ACTIVITY_CLEAR_TASK = 32768;public static final int FLAG_ACTIVITY_TASK_ON_HOME = 16384;public static final int FLAG_RECEIVER_REGISTERED_ONLY = 1073741824;public static final int FLAG_RECEIVER_REPLACE_PENDING = 536870912;public static final int FLAG_RECEIVER_FOREGROUND = 268435456;

那么對于intent.setFlags(int); 中 int值是上面四種之中的一個的話就比較簡單，比如：

intent.setFlags(536870912); ==> intent.setFlags(PendingIntent.FLAG_NO_CREATE);

可是遇到一個比較特別的：intent.setFlags(335544320);

源代碼里根本沒有這樣一個值啊，事實上intent.setFlags( A | B )是能夠使用|(或運算)的，那么：

10000000000000000000000000000 = 268435456| |100000000000000000000000000 = 67108864 10100000000000000000000000000 = 335544320即 268435456 | 67108864 = 335544320

從而:

intent.setFlags(335544320);==>

intent.setFlags( FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TOP )

或者

intent.setFlags( FLAG_RECEIVER_FOREGROUND | FLAG_ACTIVITY_CLEAR_TOP )

從 Codota 中搜索intent.setFlags(335544320);看到的是第一種情況。結合intent.setFlags()的使用方法，應該也是第一種情況。

相關資料：

http://farwmarth.com/2013/04/23/android%20反編譯和代碼解讀/

PS:

本文已整理到Github上，歡迎提交很多其它代碼！
你能夠關注的我Github、CSDN和微博

轉載于:https://www.cnblogs.com/yangykaifa/p/7279292.html

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