display activity from other application on my own application - android-fragments

Question

I would like to start an application (example Calculator) on a fragment for example on my application.
I try this code but i get an error (line Fragment):
String packageName = "com.android.calculator2";
Context ctx = getApplicationContext().createPackageContext(packageName, Context.CONTEXT_INCLUDE_CODE |
Context.CONTEXT_IGNORE_SECURITY);
ClassLoader cl = ctx.getClassLoader();
Class<?> c = cl.loadClass("com.android.calculator2.Calculator");
Fragment fragObj = (Fragment)c.newInstance();
i get this error:
Process: fr.jm.managercamera, PID: 14006
java.lang.RuntimeException: Unable to start activity ComponentInfo{fr.jm.managercamera/fr.jm.managercamera.MainActivity}: java.lang.ClassCastException: com.android.calculator2.Calculator cannot be cast to android.app.Fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
I try this code, i get other problem:
Class requiredClass = null;
final String apkPath = getPackageManager().getApplicationInfo("com.android.calculator2",0).sourceDir;
final File dexTemp = getDir("temp_folder", 0);
final String fullName = "com.android.calculator2.Calculator";
boolean isLoaded = true;
// Check if class loaded
try {
requiredClass = Class.forName(fullName);
} catch(ClassNotFoundException e) {
isLoaded = false;
}
if (!isLoaded) {
System.out.println("apkPath: " + apkPath);
System.out.println("dexTemp.getAbsolutePath(): " + dexTemp.getAbsolutePath());
final DexClassLoader classLoader = new DexClassLoader(apkPath,
dexTemp.getAbsolutePath(),
null,
getClass().getClassLoader());
/* DexClassLoader classLoader = new DexClassLoader(apkPath,"/tmp", null,
getClass().getClassLoader());*/
requiredClass = classLoader.loadClass(fullName);
}
I get this error (line loadClass):
10-03 17:50:22.776 14133-14133/? W/System.err: java.lang.ClassNotFoundException: Didn't find class "com.android.calculator2.Calculator" on path: DexPathList[[zip file "/system/app/Calculator/Calculator.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]
10-03 17:50:22.776 14133-14133/? W/System.err: at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
10-03 17:50:22.776 14133-14133/? W/System.err: at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
10-03 17:50:22.776 14133-14133/? W/System.err: at java.lang.ClassLoader.loadClass(ClassLoader.java:469)

Answer 1

You can't do that. You can launch the calculator as an Activity, but you cannot load foreign code into your own OS process. That would be a security violation.
The calculator app's code is only allowed to run in the calculator app's OS Process, not in any other OS Process. The Android security model doesn't allow that.