앱을 기기에 설치하면 레이아웃을 표시하기 전에 앱이 인터넷에 연결되어 있는지 먼저 확인해야합니다. 그래서이 접근법에 대해 아래에 간다.앱 설치 후 인터넷 연결 확인 Android
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
connectivity = new ConnectionDetector(getApplicationContext());
alertDialog = new AlertDialogManager();
//Checking for Internet connection
if(!connectivity.isConnectingToInternet()){
alertDialog.showAlertDialog(getApplicationContext(), "Internet Connection Error", "Not connected to internet", false);
return ;
}
else{
setContentView(R.layout.activity_register);
me = (EditText) findViewById(R.id.fname);
email = (EditText) findViewById(R.id.email);
age = (EditText) findViewById(R.id.age);
address = (EditText) findViewById(R.id.address);
state = (EditText) findViewById(R.id.state);
country = (EditText) findViewById(R.id.country);
done = (Button) findViewById(R.id.done);
}
}
내 ConnectionDector 클래스는 다음과 같다 :의 I가 무선 랜에 연결하고있는 경우
public class AlertDialogManager {
@SuppressWarnings("deprecation")
public void showAlertDialog(Context context, String title, String message, Boolean status){
AlertDialog alertDialog = new AlertDialog.Builder(context).create();
alertDialog.setTitle(title);
alertDialog.setMessage(message);
if(status != null){
alertDialog.setIcon((status)?R.drawable.success : R.drawable.fail);
}
alertDialog.setButton("Okay", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
alertDialog.show();
}
내 응용 프로그램이 제대로 설치됩니다 :
public class ConnectionDetector {
private Context context;
public ConnectionDetector(Context context){
this.context = context;
}
public boolean isConnectingToInternet(){
ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if(info != null){
for(int i = 0; i< info.length; i++){
if(info[i].getState() == NetworkInfo.State.CONNECTED){
return true;
}
}
}
return false;
}
}
아래는 내 AlertDialogManager 클래스입니다. 내가 아니라고하면 그 GET 내가 그것을 설치하려고 할 때 충돌 및 다음과 같은 오류 제공 :
03-24 17:01:11.169: E/AndroidRuntime(6101): FATAL EXCEPTION: main
03-24 17:01:11.169: E/AndroidRuntime(6101): Process: com.iriemo.safetyapp, PID: 6101
03-24 17:01:11.169: E/AndroidRuntime(6101): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.demoApp/com.example.demoApp.RegisterActivity}: java.lang.NullPointerException
03-24 17:01:11.169: E/AndroidRuntime(6101): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
03-24 17:01:11.169: E/AndroidRuntime(6101): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
03-24 17:01:11.169: E/AndroidRuntime(6101): at android.app.ActivityThread.access$800(ActivityThread.java:135)
03-24 17:01:11.169: E/AndroidRuntime(6101): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
03-24 17:01:11.169: E/AndroidRuntime(6101): at android.os.Handler.dispatchMessage(Handler.java:102)
03-24 17:01:11.169: E/AndroidRuntime(6101): at android.os.Looper.loop(Looper.java:136)
03-24 17:01:11.169: E/AndroidRuntime(6101): at android.app.ActivityThread.main(ActivityThread.java:5017)
03-24 17:01:11.169: E/AndroidRuntime(6101): at java.lang.reflect.Method.invokeNative(Native Method)
03-24 17:01:11.169: E/AndroidRuntime(6101): at java.lang.reflect.Method.invoke(Method.java:515)
03-24 17:01:11.169: E/AndroidRuntime(6101): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-24 17:01:11.169: E/AndroidRuntime(6101): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-24 17:01:11.169: E/AndroidRuntime(6101): at dalvik.system.NativeStart.main(Native Method)
03-24 17:01:11.169: E/AndroidRuntime(6101): Caused by: java.lang.NullPointerException
03-24 17:01:11.169: E/AndroidRuntime(6101): at RegisterActivity.onCreate(RegisterActivity.java:26)
03-24 17:01:11.169: E/AndroidRuntime(6101): at android.app.Activity.performCreate(Activity.java:5231)
03-24 17:01:11.169: E/AndroidRuntime(6101): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-24 17:01:11.169: E/AndroidRuntime(6101): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
03-24 17:01:11.169: E/AndroidRuntime(6101): ... 11 more
alertDialog가 null입니다. –
RegisterActivity에서 26 번째 줄 포인터 예외가 발생합니다. 거기에있는 항목은 무엇입니까? – gilonm
실제로 AlertDialogManager라는 자체 AlertDialog 클래스를 만들었습니다. 내 질문에 추가 할 것입니다. – ik024