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最近私は1つのアプリを開発しました。この場合、値はMySQLデータベースからスピナーに取り込まれます。問題は、インターネットが存在しないときにクラッシュすることです。私の意図は、インターネットが存在しない場合、デフォルト値を表示することです。それ以外の場合は、インターネットが利用可能な場合は、MySQLデータベースから値を表示します。アンドロイドのスピナーにデフォルトリストを表示する方法
public class MilkProduction extends AppCompatActivity implements Spinner.OnItemSelectedListener{
private EditText quantity;
private Button submit, cancel;
private TextView date_time;
Calendar calander;
SimpleDateFormat simpleDateFormat;
String time;
private AutoCompleteTextView animal_id;
private List<Animal> fruits ;
Boolean isInternetPresent = false;
private ConnectionDetector cd;
private Spinner spinner1;
private String shift_id;
private String product;
String shiftid="",intime="",outtime="";
//JSON Array
private JSONArray result;
//An ArrayList for Spinner Items
private ArrayList<String> students;
private Animal item ;
private Animal animal=new Animal();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
setContentView(R.layout.milk_production);
animal_id = (AutoCompleteTextView) findViewById(R.id.edt_animal_id);
quantity = (EditText) findViewById(R.id.edt_milkproduction_quan);
date_time = (TextView) findViewById(R.id.txt_timt_date_year);
submit = (Button) findViewById(R.id.btn_prodc_submit);
calander = Calendar.getInstance();
simpleDateFormat = new SimpleDateFormat("dd-MM-yyyy hh:mm:ss a");
time = simpleDateFormat.format(calander.getTime());
date_time.setText(time);
date_time.setTextSize(15);
students = new ArrayList<String>();
spinner1 = (Spinner) findViewById(R.id.spinner);
spinner1.setOnItemSelectedListener(this);
cd = new ConnectionDetector(getApplicationContext());
//Calling the method that will fetch data
proautocomplete();
prodropdown();
submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
isInternetPresent = cd.isConnectingToInternet();
// check for Internet status
if (isInternetPresent) {
insertUser();
}
else{
showAlertDialog(MilkProduction.this, "Internet not available",
"Internet is not available in this device", false);
}
}
});
}
private void prodropdown() {
RestAdapter adapter = new RestAdapter.Builder()
.setEndpoint(Config.ROOT_URL) //Setting the Root URL
.build(); //Finally building the adapter
//Creating object for our interface
AnimalAPI api = adapter.create(AnimalAPI.class);
api.insertUser1(new Callback<Response>() {
@Override
public void success(Response response, Response response2) {
String detailsString = Others.getStringFromRetrofitResponse(response);
try {
//Parsing the fetched Json String to JSON Object
JSONObject j = new JSONObject(detailsString);
//Storing the Array of JSON String to our JSON Array
result = j.getJSONArray(Config.JSON_ARRAY);
//Calling method getStudents to get the students from the JSON Array
getStudents(result);
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public void failure(RetrofitError error) {
}
});
}
private void getStudents(JSONArray j) {
//Traversing through all the items in the json array
for(int i=0;i<j.length();i++){
try {
//Getting json object
JSONObject json = j.getJSONObject(i);
//Adding the name of the student to array list
students.add(json.getString(Config.TAG_USERNAME));
} catch (JSONException e) {
e.printStackTrace();
}
}
//Setting adapter to show the items in the spinner
spinner1.setAdapter(new ArrayAdapter<String>(MilkProduction.this, android.R.layout.simple_spinner_dropdown_item, students));
}
//Method to get student name of a particular position
private String getShiftid(int position){
String name="";
try {
//Getting object of given index
JSONObject json = result.getJSONObject(position);
//Fetching name from that object
// name = json.getString(Config.TAG_NAME);
name = animal.setShiftid(json.getString(Config.TAG_NAME));
} catch (JSONException e) {
e.printStackTrace();
}
//Returning the name
return name;
}
//Doing the same with this method as we did with getName()
private String getIntime(int position){
String course="";
try {
JSONObject json = result.getJSONObject(position);
// course = json.getString(Config.TAG_COURSE);
course= animal.setIntime(json.getString(Config.TAG_COURSE));
} catch (JSONException e) {
e.printStackTrace();
}
return course;
}
//Doing the same with this method as we did with getName()
private String getOuttime(int position){
String session="";
try {
JSONObject json = result.getJSONObject(position);
// session = json.getString(Config.TAG_SESSION);
session= animal.setOuttime(json.getString(Config.TAG_SESSION));
} catch (JSONException e) {
e.printStackTrace();
}
return session;
}
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
// TODO Auto-generated method stub
String spin = parent.getItemAtPosition(position).toString();
//Setting the values to textviews for a selected item
shiftid=(getShiftid(position));
intime=(getIntime(position));
outtime=(getOuttime(position));
}
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
shiftid="";
intime="";
outtime="";
}
private void insertUser() {
//While the app fetched data we are displaying a progress dialog
final ProgressDialog loading = ProgressDialog.show(this,"Loading","Please wait...",false,false);
RestAdapter adapter = new RestAdapter.Builder()
.setEndpoint(Config.ROOT_URL) //Setting the Root URL
.build(); //Finally building the adapter
//Creating object for our interface
AnimalAPI api = adapter.create(AnimalAPI.class);
api.insertUser(
animal_id.getText().toString(),
quantity.getText().toString(),
date_time.getText().toString(),
spinner1.getSelectedItem().toString(),
" ",
shiftid,
intime,
outtime,
new Callback<Response>() {
@Override
public void success(Response result, Response response) {
//On success we will read the server's output using bufferedreader
loading.dismiss();
//Creating a bufferedreader object
BufferedReader reader = null;
//An string to store output from the server
String output = "";
try {
reader = new BufferedReader(new InputStreamReader(result.getBody().in()));
//Reading the output in the string
output = reader.readLine();
} catch (IOException e) {
e.printStackTrace();
}
//Displaying the output as a toast
Toast.makeText(MilkProduction.this, output, Toast.LENGTH_LONG).show();
}
@Override
public void failure(RetrofitError error) {
//If any error occured displaying the error as toast
loading.dismiss();
Toast.makeText(MilkProduction.this, error.toString(), Toast.LENGTH_LONG).show();
}
}
);
}
}
レイアウト：
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scrollView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/mm"
>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="@dimen/dairy_layout_height"
android:orientation="vertical"
android:layout_gravity="center_horizontal"
android:gravity="center_vertical|center_horizontal"
android:layout_marginTop="25dp"
android:layout_marginRight="5dp"
android:layout_marginLeft="5dp"
android:background="@drawable/corner3"
>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_margin="13dp"
android:layout_gravity="center"
>
<TextView
android:id="@+id/heder"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Milk Production"
android:layout_gravity="center"
android:gravity="center"
android:layout_margin="5dp"
android:textSize="25sp"
android:textColor="@color/textcolour"
/>
<View
android:layout_width="250dp"
android:layout_height="2dip"
android:background="#023e64"
/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_margin="13dp"
android:layout_gravity="left"
android:layout_weight="1"
>
<TextView
android:id="@+id/txt_animal_shfit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Shift : "
android:textSize="20sp"
android:textColor="@color/textcolour"
android:layout_weight="0.40"
android:gravity="left"
android:layout_marginTop="12dp"
/>
<Spinner
android:layout_width="160dp"
android:layout_height="50dp"
android:id="@+id/spinner"
android:layout_gravity="center_horizontal"
android:spinnerMode="dialog"
android:prompt="@string/shift_prompt"
android:background="@android:drawable/btn_dropdown"
android:entries="@array/android_dropdown_arrays1"
style="@android:style/Widget.Holo.Light.Spinner"
/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_margin="13dp"
android:layout_gravity="left"
android:layout_weight="1"
>
<TextView
android:id="@+id/txt_animal_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Animal : "
android:textSize="20sp"
android:textColor="@color/textcolour"
android:layout_weight="0.40"
android:gravity="left"
/>
<AutoCompleteTextView
android:id="@+id/edt_animal_id"
android:layout_width="160dp"
android:layout_height="50dp"
android:background="@drawable/corner1"
android:layout_weight="0.60"
android:layout_alignParentLeft="true"
android:ems="10"
android:text="">
</AutoCompleteTextView>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_margin="13dp"
android:layout_gravity="left"
android:layout_weight="1"
>
<TextView
android:id="@+id/txt_milk"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Quantity : "
android:textSize="20sp"
android:textColor="@color/textcolour"
android:layout_weight="0.40"
android:gravity="left"
/>
<EditText
android:id="@+id/edt_milkproduction_quan"
android:layout_width="121dp"
android:layout_height="50dp"
android:background="@drawable/corner1"
android:layout_weight="0.60"
android:inputType="number"
android:ems="10"
/>
<TextView
android:id="@+id/txt_milk_quantity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" Lts."
android:textSize="20sp"
android:textColor="@color/textcolour"
android:layout_weight="0.40"
android:gravity="right"
/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_margin="13dp"
android:layout_gravity="left"
>
<TextView
android:id="@+id/btn_prodc_submit"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Submit"
android:textSize="@dimen/button_sub_txt_size"
android:layout_margin="@dimen/button_layout_margin"
android:background="@drawable/btnbackground"
android:textColor="@color/textcolour"
/>
</LinearLayout>
</LinearLayout>
</ScrollView>
の値を取得していない場合は、デフォルト値を表示するためにそのような何かをしようとすべきだと思いますインターネットがクラッシュしないためにインターネットは必要ありません.....何のエラーが出ていますか？ – Rudresh
@Rudresh彼はSQLite（電話）からではなくMySql（サーバー側であると思います）から取得しています – adalPaRi
はい。私はMySQLデータベースから値を取得します。インターネットが存在しない場合、アプリがクラッシュします。 –