在线程中通过 xposed 运行 以挂钩方法显示对话框

Question

我尝试在 xposed 的挂钩方法中显示 AlertDialog。 问题是方法在一个线程中是运行，这个线程在一个线程中是运行，等等...

例如： Activity -> 线程 -> 线程 -> ... -> 函数

有没有办法显示我的 AlertDialog ？我有Context，但是hook的函数不在主线程，没用

编辑（一些代码）：

public class Xposed implements IXposedHookLoadPackage {
private Context ctx;
private Queue<String> queue = new LinkedList<>();

public void handleLoadPackage(final LoadPackageParam lpparam) throws Throwable {
    if (!lpparam.packageName.equals("xxx.xxx.xxx")) {
        return;
    }

    // Here I get the context from the static class extending Application
    findAndHookMethod("xxx.xxx.xxx", lpparam.classLoader, "attachBaseContext", Context.class, new XC_MethodHook() {
        @Override
        protected void afterHookedMethod(MethodHookParam param) throws Throwable {
            XposedBridge.log("context modified");
            ctx = (Context) param.args[0];
        }
    });

    findAndHookMethod("com.xxx.xxx.xxx", lpparam.classLoader, "e", "com.xxx.xxx.xxx", String.class, new XC_MethodHook() {
        @Override
        protected void afterHookedMethod(final MethodHookParam param) throws Throwable {
            if (!(param.args[1]).equals("xxxxxxxxxxxxxx")) {
                return ;
            }

            XposedBridge.log("New element detected detected");
            Object param = param.args[0];
            Object info = callMethod(param, "q");

            // Here, I want to show my alertdialog
            DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    if (which == DialogInterface.BUTTON_POSITIVE) {

                    }
                }
            };

            // I get the classic error like what I can't modify the ui
            // in a thread that has not called Looper.prepare()
            AlertDialog.Builder builder = new AlertDialog.Builder(ctx);
            builder.setMessage("Are you sure ?")
                    .setPositiveButton("Yes", dialogClickListener)
                    .setNegativeButton("No", dialogClickListener)
                    .show();
        }
    });
}

谢谢

Answer 1

如果您是 运行 此代码在 activity 或片段中，则可以使用 runOnUiThread(runnable) 方法执行此操作。

Answer 2

由于您无权访问 activity，您可以获得主循环器，然后 post ui 相关任务。

注意：当您需要在 xposed 模块中获取当前应用程序上下文时，您不需要像 attachBaseContext 那样挂钩任何东西。 xposed api 提供了一个获取当前应用程序上下文的辅助方法 AndroidAppHelper.currentApplication().

new Handler(Looper.getMainLooper()).post(new Runnable() {
    @Override
    public void run() {
        //Do ui related stuff in here
        AlertDialog.Builder builder = new AlertDialog.Builder(AndroidAppHelper.currentApplication());
        builder.setMessage("Are you sure ?")
                .setPositiveButton("Yes", dialogClickListener)
                .setNegativeButton("No", dialogClickListener)
                .show();
    }
});

Looper.getMainLooper() 文档：http://developer.android.com/reference/android/os/Looper.html#getMainLooper()

Handler.post 文档： http://developer.android.com/reference/android/os/Handler.html#post(java.lang.Runnable)

AndroidAppHelper.currentApplication()源代码： https://github.com/rovo89/XposedBridge/blob/art/src/android/app/AndroidAppHelper.java#L143-L145

Answer 3

您始终可以保留当前 Activity (android.app.Instrumentation.newActivity) 的引用。它是这样的：

Class<?> instrumentation = XposedHelpers.findClass(
                "android.app.Instrumentation", lpparam.classLoader);

Method method = instrumentation.getMethod("newActivity",
                 ClassLoader.class, String.class, Intent.class);

XposedBridge.hookMethod(method, iHook);

在这种情况下，ihook 将是您的一个挂钩，它只静态存储当前 Activity，因此您可以从任何地方调用 runOnUiThread：

public class ActivityHook extends XC_MethodHook{

    /* Assure latest read of write */
    private static volatile Activity _currentActivity = null;

    public static Activity getCurrentActivity() {
        return _currentActivity;
    }

    @Override
    protected Object afterHookedMethod(MethodHookParam param)
            throws Throwable {
        _currentActivity = (Activity) param.getResult();
    }
}

那么您将可以在任何地方进行：

ActivityHook.getCurrentActivity().runOnUiThread(...);

祝你好运！