以编程方式清除应用程序的数据 [英] Clear Application's Data Programmatically

问题描述

我想以编程方式清除应用程序的数据.

I want to clear my application's data programmatically.

应用程序的数据可能包含数据库，共享首选项，内部-外部文件或在应用程序内创建的任何其他文件之类的东西.

Application's data may contain anything like databases, shared preferences, Internal-External files or any other files created within the application.

我知道我们可以通过以下方式清除移动设备中的数据:

I know we can clear data in the mobile device through:

设置->应用程序->管理应用程序-> My_application->清除 数据

Settings->Applications-> ManageApplications-> My_application->Clear Data

但是我需要通过Android程序来完成上述操作吗?

But I need to do the above thing through an Android Program?

推荐答案

API 19(KitKat)中引入了新的API: ActivityManager.clearApplicationUserData().

There's a new API introduced in API 19 (KitKat): ActivityManager.clearApplicationUserData().

我强烈建议在新应用程序中使用它:

I highly recommend using it in new applications:

import android.os.Build.*;
if (VERSION_CODES.KITKAT <= VERSION.SDK_INT) {
    ((ActivityManager)context.getSystemService(ACTIVITY_SERVICE))
            .clearApplicationUserData(); // note: it has a return value!
} else {
    // use old hacky way, which can be removed
    // once minSdkVersion goes above 19 in a few years.
}

如果您不想采用骇人听闻的方式，还可以隐藏UI上的按钮，以便该功能仅在旧手机上不可用.

If you don't want the hacky way you can also hide the button on the UI, so that functionality is just not available on old phones.

对于使用 android:manageSpaceActivity .

每当我使用它时，我都会从具有android:process=":manager"的manageSpaceActivity中进行操作.在这里，我手动终止了我应用程序的所有 other 进程.这样，我就可以让UI保持运行状态，并让用户决定下一步要去哪里.

Whenever I use this, I do so from a manageSpaceActivity which has android:process=":manager". There, I manually kill any other processes of my app. This allows me to let a UI stay running and let the user decide where to go next.

private static void killProcessesAround(Activity activity) throws NameNotFoundException {
    ActivityManager am = (ActivityManager)activity.getSystemService(Context.ACTIVITY_SERVICE);
    String myProcessPrefix = activity.getApplicationInfo().processName;
    String myProcessName = activity.getPackageManager().getActivityInfo(activity.getComponentName(), 0).processName;
    for (ActivityManager.RunningAppProcessInfo proc : am.getRunningAppProcesses()) {
        if (proc.processName.startsWith(myProcessPrefix) && !proc.processName.equals(myProcessName)) {
            android.os.Process.killProcess(proc.pid);
        }
    }
}

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