在服务中使用 startActivityForResult 启动活动

Question

我的 startActivityForResult 函数有问题。

我有一个活动 MqttClientActivity

public class MqttClientActivity extends Activity {

    static final int ACTIVATION_REQUEST = 47; // identifies our request id

    private static Context context;

    static DevicePolicyManager devicePolicyManager;
    static ComponentName demoDeviceAdmin;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        MqttClientActivity.context = getApplicationContext();

        // Initialize Device Policy Manager service and our receiver class
        devicePolicyManager = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
        demoDeviceAdmin = new ComponentName(this, DemoDeviceAdminReceiver.class);
    }

    public static void test() {
        boolean active = devicePolicyManager.isAdminActive(demoDeviceAdmin);
        if (active) {
                         //do something...
        }
        else {
            // Activate device administration
            Intent intent = new Intent(
                    DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
            intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,
                    demoDeviceAdmin);
            intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
                    "Your boss told you to do this");
            startActivityForResult(intent, ACTIVATION_REQUEST);
        }
    }
}

我有这门课：

https://github.com/dobermai/android-mqtt-push/blob/master/src/de/eclipsemagazin/mqtt/push/MQTTService.java

然后：

https://github.com/dobermai/android-mqtt-push/blob/master/src/de/eclipsemagazin/mqtt/push/PushCallback.java

在后一个类中，我想在 messageArrived 函数中调用我的测试函数 (MqttClientActivity)，我该怎么做？我已经将函数设置为静态，变量“devicePolicyManager”和“demoDeviceAdmin”设置为静态，但我无法启动 activty...

谁能帮帮我？

谢谢

Answer 1

首先，您不能从Service 调用startActivityForResult()。充其量，您可以通过Service 拨打startActivity()。

其次，您不能从static 方法调用startActivity()（或startActivityForResult()），除非在Context（或Activity 用于startActivityForResult()）上调用它，因为它们不是@987654331 @ 方法。