Android将活动带到了前面

Question

We have a requirement to have our application always be on top. Effectively we need to create a kiosk mode for the device. These devices will be supplied to users so they are only using our application on the device.

We have done some research into trapping all possible key events such as the user pressing Home and Search but this method seems quite difficult.

We have decided to try creating a service with our application that will monitor what the topmost process is and if it is not our application to return ours to the top. We are stuck on the part of bringing our application to the top. When attempting to use StartActivity(), nothing happens. We thought it would be possible to do this in the same way that the home launcher calls our activity.

We have reviewed all posts related to this but haven't seen to found the right solution. If there is a better way to go about it, please let me know!

many, many thanks.

Answer 1

These devices will be supplied to users so they are only using our application on the device.

The only way that will completely work is if you are manufacturing the device yourself.

We have decided to try creating a service with our application that will monitor what the topmost process is and if it is not our application to return ours to the top. We are stuck on the part of bringing our application to the top. When attempting to use StartActivity(), nothing happens. We thought it would be possible to do this in the same way that the home launcher calls our activity.

Why don't you just make your application the home screen? That way, anyone pressing HOME will go to your application.

Of course, users can reboot these devices into "safe mode" and remove your app, unless you are manufacturing the device yourself and can have yours be the firmware's home screen.

Answer 2

Well I'm developing an application which has to be unexitable. This is because this app is used by traffic wardens, not for daily phoning and we had to make sure that they don't exit our app and surf on the internet instead of working.

So you have to put this into your mainfest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.example.droid"
      android:versionCode="1"
      android:versionName="1.0">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>
    <uses-permission android:name="android.permission.CALL_PHONE"/>
    <uses-permission android:name="android.permission.GET_TASKS"/>
    <uses-permission android:name="android.permission.READ_CONTACTS"/>
    <uses-permission android:name="android.permission.SET_WALLPAPER" />
    <uses-permission android:name="android.permission.EXPAND_STATUS_BAR"/>
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" /> 

    <application 
        persistent="true"
        android:icon="@drawable/icon" 
        android:label="@string/app_name" 
        android:debuggable="true">
        <activity android:name=".YourActivity"
                  android:label="@string/app_name"
                  android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
                  android:imeOptions="actionSend|flagNoEnterAction"
                  android:configChanges="keyboardHidden|orientation">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
                <category android:name="android.intent.category.HOME"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </activity>
        <receiver android:name="BootReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
                <category android:name="android.intent.category.HOME" />
            </intent-filter>
        </receiver> 
    </application>
</manifest> 

You have to put a boot receiver class in your app:

(BootReceiver.java)

public class BootReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent arg1) {
        Intent startupIntent = new Intent(context, YourActivity.class);
        startupIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(startupIntent);
    }

}

After this you have to disable all buttons in your Activities:

/**
 * This method disables all buttons.   
 */
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    return true;
}

/**
 * This method disables all buttons.
 */
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
    return true;
}

Now you have the foundation of an application which cannot be exited (even the user presses the home button), and if he restarts the phone your application runs as soon as the boot is completed. Now he can only wipe your app if he has adb (and you left usb debugging on), or if he hard resets the phone.

Feel free to ask questions if it is not clear or if i left some mistakes in the code below. And by the way you have to replace the ...-s in with your own code.

Edit: corrected the xml.