当我打开我的应用程序时，它会在吐司之前崩溃。我不知道应该如何使用我的方法isOnline()
public class Url_cont extends AsyncTask<String, Object, ArrayList<Movie>> {
final String log_tag = Url_cont.class.getSimpleName();
ArrayList<Movie> resultObj = new ArrayList<>();
ICallBack myCallBack;
private Context mContext;
ProgressDialog progressDialog;
public Url_cont(ICallBack NetworkCallBack, Context mContext) {
myCallBack = NetworkCallBack;
this.mContext = mContext;
}
public boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netinfo = cm.getActiveNetworkInfo();
return netinfo != null && netinfo.isConnectedOrConnecting();
}
@Override
protected void onPreExecute() {
super.onPreExecute();
if (isOnline() != false) {
progressDialog = new ProgressDialog(mContext);
progressDialog.setMessage("Please wait...");
progressDialog.show();
} else {
Context context = mContext;
CharSequence text = "check your internet connection!";
int duration = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
}
private ArrayList<Movie> formatMyJson(String jsonstr) throws JSONException {
JSONObject object = new JSONObject(jsonstr);
JSONArray mylist = object.getJSONArray("results");
Movie mMovie;
for (int i = 0; i < mylist.length(); i++) {
mMovie = new Movie();
JSONObject mynewob = mylist.getJSONObject(i);
mMovie.setVote(mynewob.getString("vote_average"));
mMovie.setTitle(mynewob.getString("original_title"));
mMovie.setPoster_image(mynewob.getString("poster_path"));
mMovie.setOverview(mynewob.getString("overview"));
mMovie.setDate(mynewob.getString("release_date"));
resultObj.add(mMovie);
}
return resultObj;
}
@Override
protected ArrayList<Movie> doInBackground(String... params) {
HttpURLConnection httpURLConnection = null;
BufferedReader reader = null;
String jsonstr = null;
try {
Uri builtUri = Uri.parse(params[0]).buildUpon().appendQueryParameter("api_key", BuildConfig.APIKRY).build();
Log.i("url_site", builtUri.toString());
URL uRl = new URL(builtUri.toString());
httpURLConnection = (HttpURLConnection) uRl.openConnection();
httpURLConnection.connect();
int responseCode = httpURLConnection.getResponseCode();
Log.i("ResponseCode", String.valueOf(responseCode));
BufferedReader in = new BufferedReader(
new InputStreamReader(httpURLConnection.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
jsonstr = response.toString();
} catch (Exception e) {
Log.e(log_tag, "this url has a problem 111");
} finally {
if (httpURLConnection != null) {
httpURLConnection.disconnect();
}
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
try {
return formatMyJson(jsonstr);
} catch (Exception e) {
Log.i(log_tag, "not thing work at alllllll");
}
return null;
}
@Override
protected void onPostExecute(ArrayList<Movie> strings) {
progressDialog.dismiss();
myCallBack.onPostExcuteCallBack(strings);
}
}
此错误显示
10-30 07:11:44.420 3180-3180/com.massive.movieapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.massive.movieapp, PID: 3180
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.massive.movieapp/com.massive.movieapp.MainActivity}: java.lang.SecurityException: ConnectivityService: Neither user 10060 nor current process has android.permission.ACCESS_NETWORK_STATE.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.SecurityException: ConnectivityService: Neither user 10060 nor current process has android.permission.ACCESS_NETWORK_STATE.
at android.os.Parcel.readException(Parcel.java:1465)
at android.os.Parcel.readException(Parcel.java:1419)
at android.net.IConnectivityManager$Stub$Proxy.getActiveNetworkInfo(IConnectivityManager.java:817)
at android.net.ConnectivityManager.getActiveNetworkInfo(ConnectivityManager.java:565)
at com.massive.movieapp.Url_cont.isOnline(Url_cont.java:41)
at com.massive.movieapp.Url_cont.onPreExecute(Url_cont.java:49)
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
at android.os.AsyncTask.execute(AsyncTask.java:535)
at com.massive.movieapp.FragmentForActivity.CallNetwork(FragmentForActivity.java:47)
at com.massive.movieapp.FragmentForActivity.onCreate(FragmentForActivity.java:43)
at android.app.Fragment.performCreate(Fragment.java:1678)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:859)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)
at android.app.BackStackRecord.run(BackStackRecord.java:684)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)
at android.app.Activity.performStart(Activity.java:5240)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2157)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
这是我的清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.massive.movieapp">
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<application
android:allowBackup="true"
android:icon="@drawable/videoplayer"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
答案 0 :(得分：1)
最后我解决了这个问题
private void CallNetwork(String baseUrl) {
if (NetworkUtils.isNetworkAvailable(getActivity())) {
new Url_cont(this, getActivity()).execute(baseUrl);
} else {
CharSequence text = "check your internet connection!";
int duration = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(getActivity(), text, duration);
toast.show();
}
public static boolean isNetworkAvailable(Context mContext) {
ConnectivityManager mConnectivityManager = (ConnectivityManager)mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
if (mNetworkInfo != null && mNetworkInfo.isConnected()) {
return true;
}
return false;
}
我先把检查放在我的代码中做任何事情，谢谢你的帮助
答案 1 :(得分：0)
似乎，您忘记在android.permission.ACCESS_NETWORK_STATE中设置权限AndroidManifest.xml。你应该添加
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
与之相符。
答案 2 :(得分：0)
在AndroidManifest.xml
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
以下是AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.new">
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="false"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:largeHeap="true"
android:supportsRtl="true"
android:theme="@style/AppTheme"
tools:replace="android:icon">
<!-- Your Activities here -->
</application>
</manifest>