Question

我目前有一个Android Wear应用程序，向用户显示10个项目的列表。当应用程序打开时，会出现一个带有单个图像的闪屏，同时会向手机发送一条消息以检索必要的列表数据。

我想在我的图片下面添加一个ProgressDialog。我的第一个问题是，这可能吗？如果是这样，怎么样？

我将发布下面的代码，但我遵循了在此处制作ProgressDialog的建议：Android loading animation。我可以成功创建ProgressDialog，但我遇到了一些问题。

ProgressDialog视图取代了我最初的初始屏幕图像。
doInBackground()调用函数向配对的手机发送消息，以获取列表数据。由于必须等待onMessageReceived()中的回复，因此会立即拨打onPostExecute()并关闭对话。
如果我尝试手动调用onPostExecute()，在获得列表数据后，ProgressDialog永远不会关闭。

任何帮助将不胜感激。谢谢。

public class InitialActivity extends Activity implements
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        MessageApi.MessageListener{
    private WearableListItem[] items = new WearableListItem[10];
    private String nodeID;
    private GoogleApiClient mGoogleApiClient;
    private ProgressDialog mDialog;
    private ProgressTask progressTask;
    private boolean done = false;

    private class ProgressTask extends AsyncTask<Void, Void, Void>{
        ProgressDialog asyncDialog = new ProgressDialog(InitialActivity.this);

        @Override
        protected void onPreExecute(){
            //set message of the dialog
            asyncDialog.setMessage("Loading...");
            asyncDialog.setCancelable(false);
            //show dialog
            asyncDialog.show();
            super.onPreExecute();
        }

        @Override
        protected Void doInBackground(Void... arg0) {
            //don't touch dialog here it'll break the application
            //do some lengthy stuff like calling login webservice
            retrieveDeviceNode();
            return null;
        }

        @Override
        protected void onPostExecute(Void result){
            //hide the dialog
//            if(done)
//            {
                asyncDialog.dismiss();
//            }
            super.onPostExecute(result);
        }
    }

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

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addApi(Wearable.API)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .build();
    }

    @Override
    protected void onResume() {
        super.onResume();
        mGoogleApiClient.connect();
    }

    @Override
    public void onConnected(Bundle bundle) {
        Wearable.MessageApi.addListener(mGoogleApiClient, this);
//        retrieveDeviceNode();
        progressTask = new ProgressTask();
        progressTask.execute();
    }

    @Override
    protected void onPause(){
        super.onPause();
        Wearable.MessageApi.removeListener(mGoogleApiClient, this);
        mGoogleApiClient.disconnect();
    }

    private void sendMessage(String message) {
        Wearable.MessageApi.sendMessage(mGoogleApiClient, nodeID, message, null);
    }

    @Override
    public void onMessageReceived(MessageEvent messageEvent) {
        nodeID = messageEvent.getSourceNodeId();
        if (messageEvent.getPath().contains("/joblist")) {
            List<Drawable> drawables = getDrawableList(messageEvent.getData());
            String jobList = messageEvent.getPath().substring(8);
            initJobList(jobList, drawables);
            done = true;
            progressTask.onPostExecute(null);
            Intent intent = new Intent(this,MainActivity.class);
            startActivity(intent);
        }
    }

    private void retrieveDeviceNode(){
        new Thread(new Runnable() {
            @Override
            public void run() {
                NodeApi.GetConnectedNodesResult result = Wearable.NodeApi.getConnectedNodes(mGoogleApiClient).await();
                if(result.getNodes().size() > 0){
                    nodeID = result.getNodes().get(0).getId();
                    sendMessage("/getWearData");
                }
                else{
                    nodeID = "";
                }
            }
        }).start();
    }
}

Answer 1

为什么不简单地将ProgressBar组件添加到显示图像的视图中，并在启动过程时显示该组件并在完成后隐藏它？

Android Wear ProgressDialog和MessageAPI问题

1 个答案: