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当我编写 mNavigationView.setNavigationItemSelectedListener(this); 时,应用程序崩溃在代码中如果未添加,则会删除导航栏中该项目的功能。我应该在后台线程中运行哪种方法以减少对主线程的影响。
import android.app.Activity;
import android.support.annotation.NonNull;
import android.support.design.widget.NavigationView;
import android.support.v4.widget.DrawerLayout;
import android.support.v4.widget.SwipeRefreshLayout;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.Loader;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.eggheadgames.aboutbox.AboutConfig;
import com.eggheadgames.aboutbox.IAnalytic;
import com.eggheadgames.aboutbox.IDialog;
import com.eggheadgames.aboutbox.activity.AboutActivity;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class EarthquakeActivity extends AppCompatActivity implements SharedPreferences.OnSharedPreferenceChangeListener, SwipeRefreshLayout.OnRefreshListener, LoaderManager.LoaderCallbacks<List<Earthquake>>, NavigationView.OnNavigationItemSelectedListener {
public static final String MyPrefs = "MyPrefs";
private DrawerLayout mdrawerlayout;
private ActionBarDrawerToggle mToogle;
/** URL for earthquake data from the USGS dataset */
private static final String USGS_REQUEST_URL = "https://earthquake.usgs.gov/fdsnws/event/1/query";
/**
* Constant value for the earthquake loader ID. We can choose any integer.
* This really only comes into play if you're using multiple loaders.
*/
private static final int EARTHQUAKE_LOADER_ID = 1;
/** Adapter for the list of earthquakes */
private EarthquakeAdapter mAdapter;
/** TextView that is displayed when the list is empty */
private TextView mEmptyStateTextView;
SwipeRefreshLayout swipe;
private static final String LOG_TAG = EarthquakeActivity.class.getSimpleName();
private ListView earthquakeListView;
private static final String TWITTER_USER_NAME = "vaibhav_khulbe";
private static final String WEB_HOME_PAGE = "https://about.me/vaibhav_khulbe";
private static final String APP_PUBLISHER = "https://play.google.com/store/apps/developer?id=Vaibhav%20Khulbe&hl=en";
private static final String EMAIL_ADDRESS = "khulbevaibhavdev@gmail.com";
private static final String EMAIL_SUBJECT = "Quake Info app acknowledgements and/or issues";
private static final String EMAIL_BODY = "Please explain your experience with this app here...This may include bugs" +
" or issues you may be facing or what you liked about the app along with improvements. :) (MAKE SURE to clear out these lines before sending the mail to us)";
Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.earthquake_activity);
mdrawerlayout=(DrawerLayout)findViewById(R.id.drawer);
mToogle=new ActionBarDrawerToggle(this,mdrawerlayout,R.string.open,R.string.close);
mdrawerlayout.addDrawerListener(mToogle);
mToogle.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
NavigationView mNavigationView=(NavigationView)findViewById(R.id.navigation_view);
mNavigationView.setNavigationItemSelectedListener(this);
swipe = findViewById(R.id.swiperefresh);
swipe.setOnRefreshListener(this);
swipe.setColorSchemeColors(getResources().getColor(R.color.colorAccent));
/* Start the intro only once */
SharedPreferences sp = getSharedPreferences(MyPrefs, Context.MODE_PRIVATE);
if (!sp.getBoolean("first", false)) {
SharedPreferences.Editor editor = sp.edit();
editor.putBoolean("first", true);
editor.apply();
Intent intent = new Intent(this, IntroActivity.class);
startActivity(intent);
}
//Call and launch About activity
initAboutActivity();
// Find a reference to the {@link ListView} in the layout
earthquakeListView = (ListView) findViewById(R.id.list);
mEmptyStateTextView = (TextView) findViewById(R.id.empty_view);
earthquakeListView.setEmptyView(mEmptyStateTextView);
// Create a new adapter that takes an empty list of earthquakes as input
mAdapter = new EarthquakeAdapter(this, new ArrayList<Earthquake>());
// Set the adapter on the {@link ListView}
// so the list can be populated in the user interface
earthquakeListView.setAdapter(mAdapter);
// Obtain a reference to the SharedPreferences file for this app
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
// And register to be notified of preference changes
// So we know when the user has adjusted the query settings
prefs.registerOnSharedPreferenceChangeListener(this);
// Set an item click listener on the ListView, which sends an intent to a web browser
// to open a website with more information about the selected earthquake.
earthquakeListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
// Find the current earthquake that was clicked on
Earthquake currentEarthquake = mAdapter.getItem(position);
// Convert the String URL into a URI object (to pass into the Intent constructor)
Uri earthquakeUri = Uri.parse(currentEarthquake.getUrl());
// Create a new intent to view the earthquake URI
Intent websiteIntent = new Intent(Intent.ACTION_VIEW, earthquakeUri);
// Send the intent to launch a new activity
startActivity(websiteIntent);
}
});
getSupportLoaderManager().initLoader(EARTHQUAKE_LOADER_ID, null, this);
}
/*Code to launch About activity */
public void initAboutActivity()
{
/* Create About activity */
AboutConfig aboutConfig = AboutConfig.getInstance();
aboutConfig.appName = getString(R.string.app_name);
aboutConfig.appIcon = R.mipmap.ic_launcher;
aboutConfig.version = "1.0.0";
aboutConfig.author = "Vaibhav Khulbe";
aboutConfig.aboutLabelTitle = "About";
aboutConfig.packageName = getApplicationContext().getPackageName();
aboutConfig.appPublisher = APP_PUBLISHER;
aboutConfig.twitterUserName = TWITTER_USER_NAME;
aboutConfig.webHomePage = WEB_HOME_PAGE;
aboutConfig.dialog = new IDialog() {
@Override
public void open(AppCompatActivity appCompatActivity, String url, String tag) {
// handle custom implementations of WebView. It will be called when user click to web items. (Example: "Privacy", "Acknowledgments" and "About")
}
};
aboutConfig.analytics = new IAnalytic() {
@Override
public void logUiEvent(String s, String s1) {
// handle log events.
}
@Override
public void logException(Exception e, boolean b) {
// handle exception events.
}
};
// set it only if aboutConfig.analytics is defined.
aboutConfig.logUiEventName = "Log";
// Contact Support email details
aboutConfig.emailAddress = EMAIL_ADDRESS;
aboutConfig.emailSubject = EMAIL_SUBJECT;
aboutConfig.emailBody = EMAIL_BODY;
aboutConfig.shareMessage = getString(R.string.share_message);
aboutConfig.sharingTitle = getString(R.string.sharing_title);
}
@Override
public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
if (key.equals(getString(R.string.settings_min_magnitude_key)) ||
key.equals(getString(R.string.settings_order_by_key))){
// Clear the ListView as a new query will be kicked off
mAdapter.clear();
// Hide the empty state text view as the loading indicator will be displayed
mEmptyStateTextView.setVisibility(View.GONE);
// Show the loading indicator while new data is being fetched
View loadingIndicator = findViewById(R.id.loading_indicator);
loadingIndicator.setVisibility(View.VISIBLE);
// Restart the loader to requery the USGS as the query settings have been updated
getSupportLoaderManager().restartLoader(EARTHQUAKE_LOADER_ID, null, this);
}
}
@Override
public Loader<List<Earthquake>> onCreateLoader(int i, Bundle bundle) {
SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);
String minMagnitude = sharedPrefs.getString(
getString(R.string.settings_min_magnitude_key),
getString(R.string.settings_min_magnitude_default));
String orderBy = sharedPrefs.getString(
getString(R.string.settings_order_by_key),
getString(R.string.settings_order_by_default)
);
String region = sharedPrefs.getString(
getString(R.string.settings_narrow_by_region_key),
getString(R.string.settings_narrow_by_region_default)
);
String radius = sharedPrefs.getString(
getString(R.string.settings_maximum_radius_key),
getString(R.string.settings_maximum_radius_default)
);
List<Country> countries = new ArrayList<>();
try {
countries = Utils.generateCountryList(this);
} catch (IOException e) {
e.printStackTrace();
}
Double latitude = 0.0;
Double longitude = 0.0;
for (Country country : countries) {
if(country.getName().equalsIgnoreCase(region)){
latitude = country.getLatitude();
longitude = country.getLongitude();
}
}
Uri baseUri = Uri.parse(USGS_REQUEST_URL);
Uri.Builder uriBuilder = baseUri.buildUpon();
uriBuilder.appendQueryParameter("format", "geojson");
uriBuilder.appendQueryParameter("limit", "100");
uriBuilder.appendQueryParameter("minmag", minMagnitude);
uriBuilder.appendQueryParameter("orderby", orderBy);
if(latitude != 0.0 && longitude != 0.0){
uriBuilder.appendQueryParameter("latitude", String.valueOf(latitude.intValue()));
uriBuilder.appendQueryParameter("longitude", String.valueOf(longitude.intValue()));
uriBuilder.appendQueryParameter("maxradius", radius);
}
String url = uriBuilder.toString();
return new EarthquakeLoader(this, url);
}
@Override
public void onLoadFinished(Loader<List<Earthquake>> loader, List<Earthquake> earthquakes) {
swipe.setRefreshing(false);
// Hide loading indicator because the data has been loaded
View loadingIndicator = findViewById(R.id.loading_indicator);
loadingIndicator.setVisibility(View.GONE);
if (earthquakes != null && !earthquakes.isEmpty()) {
this.showResults(earthquakes);
} else {
this.hideResults();
}
}
@Override
public void onLoaderReset(Loader<List<Earthquake>> loader) {
// Loader reset, so we can clear out our existing data.
mAdapter.clear();
}
/**
* method to show results
*/
private void showResults(List<Earthquake> earthquakeList) {
mAdapter.clear();
earthquakeListView.setVisibility(View.VISIBLE);
mEmptyStateTextView.setVisibility(View.GONE);
mAdapter.setNotifyOnChange(false);
mAdapter.setNotifyOnChange(true);
mAdapter.addAll(earthquakeList);
}
/**
* method to hide results also checks internet connection
*/
private void hideResults() {
earthquakeListView.setVisibility(View.GONE);
mEmptyStateTextView.setVisibility(View.VISIBLE);
// Get a reference to the ConnectivityManager to check state of network connectivity
ConnectivityManager connMgr = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
// Get details on the currently active default data network
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected()) {
mEmptyStateTextView.setText(R.string.no_earthquakes);
Log.e(LOG_TAG, "no earthquakes data");
} else {
mEmptyStateTextView.setText(R.string.no_internet_connection);
Log.e(LOG_TAG, "no internet");
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (mToogle.onOptionsItemSelected(item)){
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onRefresh() {
getSupportLoaderManager().restartLoader(EARTHQUAKE_LOADER_ID, null, this);
Toast.makeText(this, R.string.list_refreshed, Toast.LENGTH_SHORT).show();
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
Intent settingsIntent = new Intent(this, SettingsActivity.class);
startActivity(settingsIntent);
return true;
}
if (id == R.id.action_about) {
Intent actionIntent = new Intent(this, AboutActivity.class);
startActivity(actionIntent);
return true;
}
if (id == R.id.action_did_you_feel_it){
Intent feelItIntent = new Intent(this, DidYouFeel.class);
startActivity(feelItIntent);
return true;
}
if (id == R.id.action_more_apps){
Uri uri = Uri.parse( "https://play.google.com/store/apps/developer?id=Vaibhav+Khulbe" );
startActivity( new Intent( Intent.ACTION_VIEW, uri ) );
}
if (id == R.id.fork_project){
Uri uri = Uri.parse( "https://github.com/Kvaibhav01/Quake-Info" );
startActivity( new Intent( Intent.ACTION_VIEW, uri ) );
}
if (id == R.id.notification){
Intent notificationIntent = new Intent(this, EarthquakeNotification.class);
startActivity(notificationIntent);
}
return true;
}
}
我认为可以通过在后台线程中运行该方法来完成,但我不确定如何做到这一点。感谢您的帮助
最佳答案
您可以使用如下示例代码:
((MainActivity)context).runOnUiThread(new Runnable() {
public void run() {
//run another thread
}
});
或者如果您熟悉RxJava,您可以使用它。考虑到大多数时候您应该执行一个在单击后调用它的函数,而不是 click 方法。
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