模擬點擊的ap實現中，需要在源碼環境下對ap進行編譯，
android:sharedUserId="android.uid.system
讓ap具有INJEST_EVENT權限。
之前在Linux源碼中進行過編譯測試，但是編譯出來的apk打開就出錯。
這次繼續研究，還是出錯。
01-01 12:01:22.285: E/AndroidRuntime(4807): FATALEXCEPTION: main
01-01 12:01:22.285: E/AndroidRuntime(4807):Process: com.example.test2, PID: 4807
01-01 12:01:22.285: E/AndroidRuntime(4807):java.lang.RuntimeException: Unable to instantiate activityComponentInfo{com.example.test2/com.example.test2.MainActivity}:java.lang.ClassNotFoundException: Didn't find class "com.example.test2.MainActivity"on
path: DexPathList[[zip file"/system/app/Test2/Test2.apk"],nativeLibraryDirectories=[/system/app/Test2/lib/arm,/vendor/lib, /system/lib]]
01-01 12:01:22.285: E/AndroidRuntime(4807): atandroid.app.ActivityThread.performLaunchActivity(ActivityThread.java:2493)
01-01 12:01:22.285: E/AndroidRuntime(4807): atandroid.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2691)
01-01 12:01:22.285: E/AndroidRuntime(4807): atandroid.app.ActivityThread.-wrap11(ActivityThread.java)
01-01 12:01:22.285: E/AndroidRuntime(4807): atandroid.app.ActivityThread$H.handleMessage(ActivityThread.java:1491)
01-01 12:01:22.285: E/AndroidRuntime(4807): atandroid.os.Handler.dispatchMessage(Handler.java:111)
01-01 12:01:22.285: E/AndroidRuntime(4807): at android.os.Looper.loop(Looper.java:207)
01-01 12:01:22.285: E/AndroidRuntime(4807): atandroid.app.ActivityThread.main(ActivityThread.java:5779)
01-01 12:01:22.285: E/AndroidRuntime(4807): at java.lang.reflect.Method.invoke(NativeMethod)
01-01 12:01:22.285: E/AndroidRuntime(4807): atcom.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)
01-01 12:01:22.285: E/AndroidRuntime(4807): atcom.android.internal.os.ZygoteInit.main(ZygoteInit.java:739)
01-01 12:01:22.285: E/AndroidRuntime(4807): Causedby: java.lang.ClassNotFoundException: Didn't find class"com.example.test2.MainActivity" on path: DexPathList[[zip file"/system/app/Test2/Test2.apk"],nativeLibraryDirectories=[/system/app/Test2/lib/arm,/vendor/lib,
/system/lib]]
01-01 12:01:22.285: E/AndroidRuntime(4807): atdalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
01-01 12:01:22.285: E/AndroidRuntime(4807): atjava.lang.ClassLoader.loadClass(ClassLoader.java:511)
01-01 12:01:22.285: E/AndroidRuntime(4807): at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
01-01 12:01:22.285: E/AndroidRuntime(4807): atandroid.app.Instrumentation.newActivity(Instrumentation.java:1072)
01-01 12:01:22.285: E/AndroidRuntime(4807): atandroid.app.ActivityThread.performLaunchActivity(ActivityThread.java:2483)
01-01 12:01:22.285: E/AndroidRuntime(4807): ... 9 more
01-01 12:01:22.285: E/AndroidRuntime(4807): Suppressed: java.io.IOException: Nooriginal dex files found for dex location /system/app/Test2/Test2.apk
01-01 12:01:22.285: E/AndroidRuntime(4807): atdalvik.system.DexFile.openDexFileNative(Native Method)
01-01 12:01:22.285: E/AndroidRuntime(4807): atdalvik.system.DexFile.openDexFile(DexFile.java:295)
01-01 12:01:22.285: E/AndroidRuntime(4807): atdalvik.system.DexFile.<init>(DexFile.java:80)
01-01 12:01:22.285: E/AndroidRuntime(4807): atdalvik.system.DexFile.<init>(DexFile.java:59)
01-01 12:01:22.285: E/AndroidRuntime(4807): atdalvik.system.DexPathList.loadDexFile(DexPathList.java:279)
01-01 12:01:22.285: E/AndroidRuntime(4807): atdalvik.system.DexPathList.makePathElements(DexPathList.java:248)
01-01 12:01:22.285: E/AndroidRuntime(4807): atdalvik.system.DexPathList.<init>(DexPathList.java:120)
01-01 12:01:22.285: E/AndroidRuntime(4807): atdalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:48)
01-01 12:01:22.285: E/AndroidRuntime(4807): atdalvik.system.PathClassLoader.<init>(PathClassLoader.java:65)
01-01 12:01:22.285: E/AndroidRuntime(4807): atandroid.app.ApplicationLoaders.getClassLoader(ApplicationLoaders.java:58)
01-01 12:01:22.285: E/AndroidRuntime(4807): atandroid.app.LoadedApk.getClassLoader(LoadedApk.java:385)
01-01 12:01:22.285: E/AndroidRuntime(4807): atandroid.app.LoadedApk.makeApplication(LoadedApk.java:580)
01-01 12:01:22.285: E/AndroidRuntime(4807): atandroid.app.ActivityThread.handleBindApplication(ActivityThread.java:4983)
01-01 12:01:22.285: E/AndroidRuntime(4807): atandroid.app.ActivityThread.-wrap1(ActivityThread.java)
01-01 12:01:22.285: E/AndroidRuntime(4807): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1552)
01-01 12:01:22.285: E/AndroidRuntime(4807): ... 6 more
01-01 12:01:22.285: E/AndroidRuntime(4807): Suppressed:java.lang.ClassNotFoundException: com.example.test2.MainActivity
01-01 12:01:22.285: E/AndroidRuntime(4807): atjava.lang.Class.classForName(Native Method)
01-01 12:01:22.285: E/AndroidRuntime(4807): atjava.lang.BootClassLoader.findClass(ClassLoader.java:781)
01-01 12:01:22.285: E/AndroidRuntime(4807): at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
01-01 12:01:22.285: E/AndroidRuntime(4807): atjava.lang.ClassLoader.loadClass(ClassLoader.java:504)
01-01 12:01:22.285: E/AndroidRuntime(4807): ... 12 more
01-01 12:01:22.285: E/AndroidRuntime(4807): Caused by: java.lang.NoClassDefFoundError:Class not found using the boot class loader; no stack trace available
01-01 12:01:25.986: E/AndroidRuntime(4977): FATALEXCEPTION: main
01-01 12:01:25.986: E/AndroidRuntime(4977):Process: com.example.test2, PID: 4977
01-01 12:01:25.986: E/AndroidRuntime(4977):java.lang.RuntimeException: Unable to instantiate activityComponentInfo{com.example.test2/com.example.test2.MainActivity}:java.lang.ClassNotFoundException: Didn't find class "com.example.test2.MainActivity"on path:
DexPathList[[zip file"/system/app/Test2/Test2.apk"],nativeLibraryDirectories=[/system/app/Test2/lib/arm,/vendor/lib, /system/lib]]
搜索 Linux源碼編譯apk，反復試驗，終於解決，編譯的apk也具有了系統權限，可以實現跨進程的屏幕點擊
Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := optional
LOCAL_SRC_FILES := $(call all-subdir-java-files)
LOCAL_STATIC_JAVA_LIBRARIES += android-support-v4
LOCAL_DEX_PREOPT := false
LOCAL_MULTILIB := 32
LOCAL_PACKAGE_NAME := Test2
LOCAL_CERTIFICATE := platform
#LOCAL_CERTIFICATE := share
LOCAL_OVERRIDES_PACKAGES := Home
include $(BUILD_PACKAGE)