我想在我的应用中存档网络更改侦听器。例如：当我启动我的应用程序而没有ON Mobile Data和Wifi时，它显示＆＃34;网络不可用！＆＃34;。之后，当我在Wifi或移动数据上，它会自动获取数据并在UI上显示。
我已经扩展了Fragment实现接口以及基本片段的Main活动。 我尝试过broadcastreceiver，但它不起作用。当我在没有网络的情况下运行app时，它显示两次没有互联网连接并且在Wifi ON没有自动更新但是当我在菜单中单击其他选项然后UI显示。请帮帮我......
1-主要活动
public class MainActivity extends AppCompatActivity implements BaseFragment.OnFragmentInteractionListener{
private Realm realm;
private Results results;
RecycleAdapter recyclerAdapter;
BroadcastReceiver receiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
RealmConfiguration realmConfiguration = new RealmConfiguration.Builder
(MainActivity.this)
.build();
Realm.setDefaultConfiguration(realmConfiguration);
}
@Override
public void onTabletListener(Results result) {
DetailFragment detailFragment = (DetailFragment) getFragmentManager()
.findFragmentById(R.id.fragment_detail);
if (detailFragment != null) {
detailFragment.updateTabletUI(result);
}
}
@Override
public void onFragmentInteraction(Results currentMovie) {
DetailFragment detailFragment = (DetailFragment) getFragmentManager()
.findFragmentById(R.id.fragment_detail);
if (detailFragment == null) {
Intent intent = new Intent(this, DetailActivity.class)
.putExtra("movie_Id", currentMovie.getId())
.putExtra("movie_Name", currentMovie.getTitle())
.putExtra("poster_Path", currentMovie.getPoster_path())
.putExtra("back_poster_Path", currentMovie.getBackdrop_path())
.putExtra("release_Date", currentMovie.getRelease_date())
.putExtra("users_Rating", currentMovie.getVote_average())
.putExtra("overview", currentMovie.getOverview());
startActivity(intent);
} else {
detailFragment.updateTabletUI(currentMovie);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.favoriteList) {
Intent intent=new Intent(MainActivity.this, FavoriteActivity.class);
startActivity(intent);
}
return super.onOptionsItemSelected(item);
}
}
2- Base Fragment类
public class BaseFragment extends android.app.Fragment implements RecycleAdapter.GetDataFromAdapter {
@Bind(R.id.recyclerView)
RecyclerView recyclerView;
private static final String STATE_MOVIES = "state_movies";
private View rootView, noView;
private DataManager dataManager;
private RecycleAdapter recyclerAdapter;
private MovieResponse movieResponse;
private List<Results> resultsList;
private Results results;
private OnFragmentInteractionListener mListener;
private int menuItemPosition;
private BroadcastReceiver receiver;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putParcelableArrayList(STATE_MOVIES, (ArrayList<? extends Parcelable>) resultsList);
outState.putInt("menu_item", menuItemPosition);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.most_Popular:
if(item.isChecked()){
}else{
item.setChecked(true);
menuItemPosition = item.getItemId();
makeService("POPULAR");
return true;
}
case R.id.high_rated:
if(item.isChecked()){
}else{
item.setChecked(true);
menuItemPosition = item.getItemId();
makeService("TOP");
return true;
}
}
return super.onOptionsItemSelected(item);
}
@Override
public void onPrepareOptionsMenu(Menu menu) {
super.onPrepareOptionsMenu(menu);
// this will get called when the activity is re-created on device configuration change
menu.findItem(menuItemPosition).setChecked(true);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_base, container, false);
ButterKnife.bind(this, rootView);
resultsList=new ArrayList<Results>();
configRecycleView();
if (savedInstanceState==null){
receiver=new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
int status= NetworkStatus.getConnectivityStatus(context);
if (status==0){
}else{
makeService("POPULAR");
}
}
};
menuItemPosition = R.id.most_Popular;
}else{
resultsList=savedInstanceState.getParcelableArrayList(STATE_MOVIES);
menuItemPosition = savedInstanceState.getInt("menu_item");
recyclerAdapter.addMovieList(resultsList);
}
return rootView;
}
private void configRecycleView() {
AutofitGridlayout layoutManager = new AutofitGridlayout(getActivity(), 200 );
recyclerView.setHasFixedSize(true);
recyclerView.setRecycledViewPool(new RecyclerView.RecycledViewPool());
recyclerView.setLayoutManager(layoutManager);
recyclerAdapter = new RecycleAdapter(getActivity(), BaseFragment.this);
recyclerView.setAdapter(recyclerAdapter);
}
private void makeService(String query){
dataManager = new DataManager();
Call<MovieResponse> listCall;
if (query=="TOP") {
listCall= dataManager.getJSONData().getTopMovies();
}else{
listCall= dataManager.getJSONData().getPopMovies();
}
listCall.enqueue(new Callback<MovieResponse>() {
@Override
public void onResponse(Call<MovieResponse> call, Response<MovieResponse> response) {
if (response.isSuccessful()) {
Results[] results = response.body().getResults();
resultsList = new ArrayList<Results>(Arrays.asList(results));
recyclerAdapter.addMovieList(resultsList);
Results firstResult=resultsList.get(0);
mListener.onTabletListener(firstResult);
}
}
@Override
public void onFailure(Call<MovieResponse> call, Throwable t) {
Snackbar.make(rootView, R.string.Network_error, Snackbar.LENGTH_LONG)
.show();
}
});
}
@Override
public void onCurrentMovie(Results currentMovie) {
mListener.onFragmentInteraction(currentMovie);
}
@Override
public void onAttach(Activity context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
public interface OnFragmentInteractionListener {
void onTabletListener(Results result);
void onFragmentInteraction(Results result);
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
}
}
3- NetworkStatus类
public class NetworkStatus {
public static int TYPE_WIFI = 1;
public static int TYPE_MOBILE = 2;
public static int TYPE_NOT_CONNECTED = 0;
public static int getConnectivityStatus(Context context) {
ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
if (null != activeNetwork) {
if(activeNetwork.getType() == ConnectivityManager.TYPE_WIFI)
return TYPE_WIFI;
if(activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE)
return TYPE_MOBILE;
}
return TYPE_NOT_CONNECTED;
}
}
4-清单---
<manifest package="com.santossingh.popularmovieapp"
xmlns:android="http://schemas.android.com/apk/res/android">
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".Activities.MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity
android:name=".Activities.FavoriteActivity"
android:label="@string/title_activity_favorite"
android:parentActivityName=".Activities.MainActivity"
android:theme="@style/AppTheme.NoActionBar">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".Activities.MainActivity"/>
</activity>
<activity
android:name=".Activities.VideoActivity"
android:label="@string/title_activity_video"
android:theme="@style/AppTheme.NoActionBar">
</activity>
<activity
android:name=".Activities.DetailActivity"
android:label="@string/title_activity_detail"
android:parentActivityName=".Activities.MainActivity"
android:theme="@style/AppTheme.NoActionBar">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.santossingh.popularmovieapp.Activities.MainActivity"/>
</activity>
<activity
android:name=".Activities.ReviewActivity"
android:label="@string/title_activity_review"
android:theme="@style/AppTheme.NoActionBar">
</activity>
</application>
</manifest>
答案 0 :(得分：1)
第一件事似乎是你没有在清单文件中设置网络接收器，所以在完成所有活动标签后的清单文件中，在应用程序标签内写下代码以注册你的接收器。
<receiver android:name=".Activities.NetworkChangeReceiver" >
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
</intent-filter>
</receiver>
</application>
请注意，如果您没有接收器，请检查下面并使用它。
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
public class NetworkChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, final Intent intent)
{
String status = NetworkUtil.getConnectivityStatusString(context);
Toast.makeText(context, status, Toast.LENGTH_LONG).show();
}
}