如何在任何Activity中获取后台进程的结果?

我正在使用OTA更新。应用程序在后台与处理程序一起处理。更新完成后,我必须向用户显示警报对话框。我可以在以OTA开头的SettingsActivity中显示它,但用户可以在任何其他Activity中。

private void checkIsUpdated() {
    final Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            mDevice.getDevice().read(GattUUID.LS_DEVICE_INFORMATION, GattUUID.LC_FIRMWARE, new
                    BleDevice.ReadWriteListener() {
                        @Override
                        public void onEvent(ReadWriteEvent e) {
                            if (e.wasSuccess()) {

                                if (firmwareVersion.equals(e.data_string())) {
                                    showAlertDialog("OTA update failed", "Device is not updated");

                                } else {
                                    showAlertDialog("OTA update is successful.\nDevice is updated to new " +
                                            "firmware!", "Device is updated");

                                }

                                Log.i("OTA", "Read firmware is new success");
                            } else {
                                Log.e("OTA", "Read firmware is new success");
                            }
                        }
                    });
        }
    }, 30000);
}


AlertDialog代码

 private void showAlertDialog(String message, String title) {

    AlertDialog.Builder builder = new AlertDialog.Builder(mContext, R.style.SwipeDialogLight);
    builder.setTitle(title)
            .setMessage(message)
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }

            });

    AlertDialog alert = builder.create();
    if (!alert.isShowing()) {
        alert.show();
    }
}

最佳答案

正如@ W4R10CK所说,我也这么认为。 BroadcastReceiver可能不是一个好主意。但是后来,我对它进行了思考,如果您在checkIsUpdated中调用Service函数并从中发送Broadcast,这可能是一个可行的解决方案。

因此,基本上,您需要一个BaseActivity类,并且其中需要一个BroadcastReceiver。您需要注册onResume,然后再次取消注册onPause

而且您还需要在每个abstract中都覆盖一个Activity方法。

因此,您的BaseActivity可能看起来像这样。

public abstract class BaseActivity extends AppCompatActivity {

    private final Context context;

    public BaseActivity() {
        this.context = setContext();
    }

    protected abstract Context setContext();

    @Override
    public void onResume() {
        super.onResume();
        registerBroadcastReceiver();
    }

    @Override
    public void onPause() {
        super.onPause();
        unRegisterBroadcastReceiver();
    }

    // Declare your BroadcastReceiver here
    private class MyBroadcastReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            showAlertDialog(context);
        }
    }
}

09-28 05:03