我想为我的Android应用注入功能。 但是我一直在遭受'java.lang.ClassNotFoundException'。 我错过了什么样的事情？
首先，我想做1。 但是有很多方法可以实现，我混淆了如何实现这一点。
假设：
1.File被下载到本地数据存储库。
2.targetClassName是com.example.mari.myandroid.TestDinamicLoad。
3.SDK＆amp; Build Tools版本，（没有proguard） compileSdkVersion 22 buildToolsVersion“21.1.2”
模式A：使用URLClassLoader
编译：gradle编译，这只是原始类文件
网址：https://drive.google.com/file/d/0B0Hrot21k8nYZ2pWNXBBMU5Qd2M/view?usp=sharing
private void urlLoader(final File file){
try {
URL myurl[] = {new URL("file:" + file.toString())};
URLClassLoader x = new URLClassLoader(myurl);
Class c = x.loadClass(this.targetClassName);
for (Field f : c.getDeclaredFields()) {
Log.v(TAG, f.getName() + " : " + f.toString());
}
}catch(Exception e){
Log.v(TAG, e.toString());
}
}
模式B：使用dexLoader
编译：
javac -classpath /Applications/adt-bundle-mac/sdk/platforms/android-22/android.jar TestDinamicLoad.java
dx --dex --output TestDinamicLoad.jar TestDinamicLoad.java
URL： https://drive.google.com/file/d/0B0Hrot21k8nYdG9wdHhiOWJIVE0/view?usp=sharing
private void dexLoader(final File file){
try {
Context ctx = getApplicationContext();
String dex_dir = ctx.getDir("dex", 0).getAbsolutePath();
ClassLoader parent = getClass().getClassLoader();
DexClassLoader loader = new DexClassLoader(file.getPath(), dex_dir, null, parent);
Class c = loader.loadClass(this.targetClassName);
Object o = c.newInstance();
Method m = c.getMethod("func");
m.invoke(o);
} catch (Exception e) {
Log.v(TAG, e.toString());
}
}
错误：
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: urlLoader------
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: java.lang.ClassNotFoundException: com.example.mari.myandroid.TestDinamicLoad
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at java.net.URLClassLoader.findClass(URLClassLoader.java:753)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at com.example.mari.myandorid2.MainActivity.urlLoader(MainActivity.java:109)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at com.example.mari.myandorid2.MainActivity.access$200(MainActivity.java:23)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at com.example.mari.myandorid2.MainActivity$1.postExecute(MainActivity.java:69)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at com.example.mari.myandorid2.AsyncFileDownload.doInBackground(AsyncFileDownload.java:78)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at com.example.mari.myandorid2.AsyncFileDownload.doInBackground(AsyncFileDownload.java:19)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at android.os.AsyncTask$2.call(AsyncTask.java:288)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.Thread.run(Thread.java:818)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: Suppressed: java.lang.ClassNotFoundException: Didn't find class "com.example.mari.myandroid.TestDinamicLoad" on path: DexPathList[[directory "."],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: ... 12 more
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: Suppressed: java.lang.ClassNotFoundException: com.example.mari.myandroid.TestDinamicLoad
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.Class.classForName(Native Method)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: ... 13 more
12-26 23:20:34.817 19078-19264/com.example.mari.myandorid2 V/murotani: Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: dexLoader------
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: java.lang.ClassNotFoundException: Didn't find class "com.example.mari.myandroid.TestDinamicLoad" on path: DexPathList[[zip file "/data/data/com.example.mari.myandorid2/files/TestDinamicLoad.class"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at com.example.mari.myandorid2.MainActivity.dexLoader(MainActivity.java:91)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at com.example.mari.myandorid2.MainActivity.access$300(MainActivity.java:23)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at com.example.mari.myandorid2.MainActivity$1.postExecute(MainActivity.java:70)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at com.example.mari.myandorid2.AsyncFileDownload.doInBackground(AsyncFileDownload.java:78)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at com.example.mari.myandorid2.AsyncFileDownload.doInBackground(AsyncFileDownload.java:19)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at android.os.AsyncTask$2.call(AsyncTask.java:288)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.Thread.run(Thread.java:818)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: Suppressed: java.io.IOException: Expected valid zip or dex file: '/data/data/com.example.mari.myandorid2/files/TestDinamicLoad.class'
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at dalvik.system.DexFile.openDexFileNative(Native Method)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at dalvik.system.DexFile.openDexFile(DexFile.java:295)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at dalvik.system.DexFile.<init>(DexFile.java:111)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at dalvik.system.DexFile.loadDex(DexFile.java:151)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at dalvik.system.DexPathList.loadDexFile(DexPathList.java:265)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at dalvik.system.DexPathList.makeDexElements(DexPathList.java:231)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at dalvik.system.DexPathList.<init>(DexPathList.java:109)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:48)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at dalvik.system.DexClassLoader.<init>(DexClassLoader.java:57)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at com.example.mari.myandorid2.MainActivity.dexLoader(MainActivity.java:90)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: ... 10 more
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: Suppressed: java.lang.ClassNotFoundException: Didn't find class "com.example.mari.myandroid.TestDinamicLoad" on path: DexPathList[[zip file "/data/app/com.example.mari.myandorid2-2/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: ... 12 more
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: Suppressed: java.lang.ClassNotFoundException: com.example.mari.myandroid.TestDinamicLoad
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.Class.classForName(Native Method)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: ... 13 more
12-26 23:20:34.837 19078-19264/com.example.mari.myandorid2 V/murotani: Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
Refered： ClassNotFoundException during Dynamic Class loading in android http://tech.co/android-security-2014-07 http://larshamren.blogspot.jp/2012/02/android-dynamically-loading-classes.html