Question

这是我的MainActivity.class

public class MainActivity extends ActionBarActivity {

private static final String TAG = MainActivity.class.getSimpleName();

private Toolbar toolbar;
private static final String URL = "http://192.168.0.100:8888/androidrest/rest/service/getStores";
private ProgressDialog progressDialog;
private List<Store> stores = new ArrayList<Store>();
private static final int ACTION_SEARCH = Menu.FIRST;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    toolbar = (Toolbar) findViewById(R.id.toolbar);

    if (toolbar != null) {
        setSupportActionBar(toolbar);
        getSupportActionBar().setLogo(R.mipmap.ic_launcher);

    }

    new StoreDataLoader().execute();
}

private class StoreDataLoader extends AsyncTask<String, Void, List<Store>> {

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        progressDialog = new ProgressDialog(MainActivity.this);
        progressDialog.setMessage("Loading Stores....");
        progressDialog.show();
    }

    @Override
    protected List<Store> doInBackground(String... params) {
        JsonArrayRequest request = new JsonArrayRequest(URL,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        hideProgressDialog();

                        for (int i = 0; i < response.length(); i++) {
                            try {
                                if (BuildConfig.DEBUG) {
                                    Log.d("MainActivity", i + "");
                                }
                                JSONObject jsonObj = response.getJSONObject(i);
                                Store s = new Store();
                                s.setAddress(jsonObj.getString("address"));
                                s.setDesc(jsonObj.getString("desc"));
                                s.setName(jsonObj.getString("name"));
                                s.setStoreImg(jsonObj.getString("storeImage"));
                                s.setDistance(jsonObj.getString("dist"));
                                stores.add(s);
                            } catch (JSONException exp) {
                                exp.printStackTrace();
                            }
                        }
                    }
                },
                new Response.ErrorListener() {

                    @Override
                    public void onErrorResponse(VolleyError error) {
                        VolleyLog.d(TAG, "ERROR: " + error.getMessage());
                        hideProgressDialog();
                    }
                });

        HowmuchCacheCtrl.getInstance().addToRequestQueue(request);
        if (BuildConfig.DEBUG) {
            if (stores != null) {
                Log.d("MainActivity", "doInBackground " + stores.size());
            }
        }
        return stores;
    }

    @Override
    protected void onPostExecute(List<Store> stores) {
        super.onPostExecute(stores);
        ListView storeListView = (ListView) findViewById(R.id.storeList);
        StoreListAdapter listAdapter = new StoreListAdapter(MainActivity.this, stores);
        storeListView.setAdapter(listAdapter);
        listAdapter.notifyDataSetChanged();
        if (BuildConfig.DEBUG) {
            Log.d("MainActivity", "onPostExecute " + stores.size());
        }

    }
}
@Override
public void onDestroy() {
    super.onDestroy();
    hideProgressDialog();
}

private void hideProgressDialog() {
    if (progressDialog != null) {
        progressDialog.dismiss();
        progressDialog = null;
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu, menu);
    return super.onCreateOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.action_search:
            LinearLayout searchBtns = (LinearLayout) findViewById(R.id.searchButtons);
            searchBtns.setVisibility(View.VISIBLE);
            break;
    }

    return super.onOptionsItemSelected(item);
}
}

在logcat中，它说400 frames skipped: application doing too much work in Main Thread

此外，有时候我的listview没有显示任何数据。但是当我点击搜索操作时，列表视图会显示数据

我要做的下一步是searchButtons布局将替换为搜索类型的片段。主线程上的这个工作会不会太多？

Answer 1

解决这个问题需要识别可能发生或可能发生长时间处理的节点。最好的方法是进行所有处理，无论与主UI线程分开的线程有多小或多大。因此，无论是从SQLite数据库访问数据还是进行一些核心数学运算，或者只是对数组进行排序 - 在不同的线程中进行。

Source

应用程序在主线程中做了太多工作

1 个答案: