首先说几种去广告的方法
1. 反编译apk软件，直接修改显示广告的部分，然后保存重新编译下
2. Java hook，就如金山毒霸，lbe安全大师之类的，我也在csdn的博客上看过大牛分析
3. 修改host文件，更改广告域名指向的指向，指向为本地
先来张软件截图，软件名称是功夫勇士，无意中看到同学在玩，还有个李小龙的头像，就去豌豆荚上下载了个，很旧的游戏但操作感不错，好像是从ios上移植过来的，放张开始界面，左下角明显的广告，
有点熟悉，好像是谷歌提供之类的，顺便说几个逆向工具，apktool，dextojar，JD-JUI，IDA Pro如果还不了解自行脑补吧
载入Apktool之后查看清单文件果然有一条配置Activity的语句
[代码]java代码：
尝试把这条语句去掉之后广告就没有了如图
如果这样就结束了，托马斯和群里的他们肯定会鄙视我的，所以我继续用dextojar把dex文件转成jar文件再弄到JD-JUI中看看源码，明显看得出
谷歌广告接口的细节
java代码：当然还是主要来看launchAdActivity这个类吧，内容太多放点关键吧
java代码：1
public static void launchAdActivity(d paramd, e parame) { Activity localActivity; synchronized (a) { if (c == null) c = paramd; while (c == paramd) { localActivity = paramd.e(); if (localActivity != null) break; com.google.ads.util.a.e("activity was null while launching an AdActivity."); return; } com.google.ads.util.a.b("Tried to launch a new AdActivity with a different AdManager."); return; } Intent localIntent = new Intent(localActivity.getApplicationContext(), AdActivity.class); localIntent.putExtra("com.google.ads.AdOpener", parame.a()); try { com.google.ads.util.a.a("Launching AdActivity."); localActivity.startActivity(localIntent); return; } catch (ActivityNotFoundException localActivityNotFoundException) { com.google.ads.util.a.a(localActivityNotFoundException.getMessage(), localActivityNotFoundException); } } public g getOpeningAdWebView() { if (this.i != null) return this.i.f; synchronized (a) { if (c == null) { com.google.ads.util.a.e("currentAdManager was null while trying to get the opening AdWebView."); return null; } g localg = c.i(); if (localg != this.f) return localg; return null; } } public VideoView getVideoView() { return this.k; } public void onClick(View paramView) { finish(); } public void onCompletion(MediaPlayer paramMediaPlayer) { com.google.ads.util.a.d("Video finished playing."); if (this.k != null) this.k.setVisibility(8); this.f.loadUrl("javascript:AFMA_ReceiveMessage('onVideoEvent', {'event': 'finish'});"); } public void onCreate(Bundle paramBundle) { super.onCreate(paramBundle); d locald; Bundle localBundle; synchronized (a) { if (c != null) { locald = c; if (d == null) d = this; if ((this.i == null) && (e != null)) this.i = e; e = this; this.h = null; this.j = false; this.k = null; localBundle = getIntent().getBundleExtra("com.google.ads.AdOpener"); if (localBundle == null) a("Could not get the Bundle used to create AdActivity."); } else { a("Could not get currentAdManager."); return; } } e locale = new e(localBundle); String str1 = locale.b(); HashMap localHashMap = locale.c(); if (this == d) locald.s(); if (str1.equals("intent")) { this.f = null; this.g = SystemClock.elapsedRealtime(); this.j = true; if (localHashMap == null) { a("Could not get the paramMap in launchIntent()"); return; } String str6 = (String)localHashMap.get("u"); if (str6 == null) { a("Could not get the URL parameter in launchIntent()."); return; } String str7 = (String)localHashMap.get("i"); String str8 = (String)localHashMap.get("m"); Uri localUri = Uri.parse(str6); Object localObject3; if (str7 == null) localObject3 = new Intent("android.intent.action.VIEW", localUri); synchronized (a) { while (true) { if (b == null) { b = this; if (c == null) break; c.t(); } try { com.google.ads.util.a.a("Launching an intent from AdActivity."); startActivity((Intent)localObject3); return; } catch (ActivityNotFoundException localActivityNotFoundException) { com.google.ads.util.a.a(localActivityNotFoundException.getMessage(), localActivityNotFoundException); finish(); return; } Intent localIntent = new Intent(str7); if (str8 != null) { localIntent.setDataAndType(localUri, str8); localObject3 = localIntent; } else { localIntent.setData(localUri); localObject3 = localIntent; } } com.google.ads.util.a.e("currentAdManager is null while trying to call onLeaveApplication()."); }</div>
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广告的显示主要是一个webview，然后谷歌还用了一些工具类，包括还有定位，定位肯定是为了优化广告了，根据位置推送广告吧，
然后我还在这个AdSize类里发现了广告条大小的定义
java代码：public class AdSize { public static final AdSize BANNER = new AdSize(320, 50, “320x50_mb”); public static final AdSize IAB_BANNER = new AdSize(468, 60, “468x60_as”); public static final AdSize IAB_LEADERBOARD = new AdSize(728, 90, “728x90_as”); public static final AdSize IAB_MRECT = new AdSize(300, 250, “300x250_as”); private int a; private int b; private String c; public AdSize(int paramInt1, int paramInt2) { this(paramInt1, paramInt2, null); } private AdSize(int paramInt1, int paramInt2, String paramString) { this.a = paramInt1; this.b = paramInt2; this.c = paramString; } public int getHeight() { return this.b; } public int getWidth() { return this.a; }
真正的广告类的定义也在这个包下，类名是AdView，篇幅有限，水平也有限，分析不当的请恳切指出，大牛笑笑就过来不要拍砖我