我刚才在Android上使用SQLite，我在这里遇到了一些错误。
我有这个应用程序：
http://imgur.com/gallery/The7Q
使用下面的代码，我可以点击保存按钮和列表中的第一项，在本例中为伦敦，然后转到该地点的位置。
但是当我添加第二名并尝试上述内容时，我得到了一个：
java.lang.IndexOutOfBoundsException：Index：1，Size：1
在这一行：
//Centralize the selected item
Orientation selectedLocation = geocodingResult.getResults().get(getIntent().getIntExtra(SELECTED_POSITION, 1)).getGeometry().getLocation();
如何解决这个问题？
地图活动：
public class MapActivity extends AppCompatActivity {
private GoogleMap map;
private GeocodeResult geocodingResult;
List<Address> listAddresses;
String address = "";
public LatLng latlng;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.activity_map_googlemap)).getMap();
addMarkers();
}
// Show the markers on the map
public void addMarkers() {
Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
geocodingResult = getIntent().getParcelableExtra(MainActivity.RESULT);
if (geocodingResult != null) {
// For each Geocoding object, get the results markers
for (Geocoding geocoding : geocodingResult.getResults()) {
map.addMarker(new MarkerOptions()
.position(new LatLng(geocoding.getGeometry().getLocation().getLat(), geocoding.getGeometry().getLocation().getLng()))
.icon(BitmapDescriptorFactory.defaultMarker())
.title(geocoding.getFormattedAddress()) //location name that will be shown when click the marker
.snippet(String.valueOf(geocoding.getGeometry().getLocation().getLat())
+ ", "
+ String.valueOf(geocoding.getGeometry().getLocation().getLng())) //coordinates that will be shown when click the marker
);
try {
latlng = new LatLng(geocoding.getGeometry().getLocation().getLat(), geocoding.getGeometry().getLocation().getLng());
listAddresses = geocoder.getFromLocation(geocoding.getGeometry().getLocation().getLat(), geocoding.getGeometry().getLocation().getLng(), 1); // Here 1 represent max location result to returned, by documents it recommended 1 to 5
} catch (IOException e) {
e.printStackTrace();
}
Log.d("LIST", String.valueOf(listAddresses));
}
//Centralize the selected item
Orientation selectedLocation = geocodingResult.getResults().get(getIntent().getIntExtra(SELECTED_POSITION, 1)).getGeometry().getLocation();
map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(selectedLocation.getLat(), selectedLocation.getLng()), 4));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
if (item.getItemId() == R.id.save) {
try {
List<Address> listAddresses = geocoder.getFromLocation(latlng.latitude, latlng.longitude, 1);
if (listAddresses != null && listAddresses.size() > 0) {
if (listAddresses.get(0).getLocality() != null) {
if (listAddresses.get(0).getPostalCode() != null) {
address += listAddresses.get(0).getLocality() + " ";
}
address += listAddresses.get(0).getPostalCode();
}
}
Log.d("LIST", String.valueOf(listAddresses));
} catch (IOException e) {
e.printStackTrace();
}
if (address == "") {
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm yyyy-MM-dd");
address = sdf.format(new Date());
}
DBController crud = new DBController(getBaseContext());
String result;
result = crud.insertData(address, latlng.latitude, latlng.longitude);
Log.d("ADDRESS", address);
Log.d("LAT", String.valueOf(latlng.latitude));
Log.d("LNG", String.valueOf(latlng.longitude));
Toast.makeText(getApplicationContext(), result, Toast.LENGTH_LONG).show();
}
return super.onOptionsItemSelected(item);
}// END MENU
主要
public class MainActivity extends AppCompatActivity {
public final static String RESULT = "listGeocoding";
public final static String SELECTED_POSITION = "selectedPosition";
public static ListView listView;
EditText edtSearch;
Button btnSearch;
GeocodeResult geocodingResult;
Dialog dialogProgress;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edtSearch = (EditText) findViewById(R.id.edtSearch);
btnSearch = (Button) findViewById(R.id.btnSearch);
listView = (ListView) findViewById(R.id.listView);
setListeners();
}// END ON CREATE
// Set Listeners to the activity
private void setListeners() {
//region Button click jump to SearchAddress method
btnSearch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
searchAddress();
}
});
//endregion
//region List View Click jump to MapActivity
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(MainActivity.this, MapActivity.class);
intent.putExtra(RESULT, geocodingResult);
intent.putExtra(SELECTED_POSITION, position);
startActivity(intent);
}
});
//endregion
}// END METHOD
//region Deal with orientation changes
@Override
protected void onSaveInstanceState(Bundle outState) {
outState.putParcelable(RESULT, geocodingResult);
super.onSaveInstanceState(outState);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
geocodingResult = savedInstanceState.getParcelable(RESULT);
if (geocodingResult != null && geocodingResult.getResults().size() > 0) {
loadResult();
}
}
//endregion
//region Search method
private void searchAddress() {
//region Deal with the keyboard and user input
CommonUtils.hideKeyboard(MainActivity.this, edtSearch);
// Ask the user for the address if not provided
if (edtSearch.getText().toString().equals("")) {
Toast.makeText(MainActivity.this, "Please enter an address", Toast.LENGTH_SHORT).show();
return; // pause and await for response
}
//endregion
listView.setVisibility(View.GONE);
showProgress();
//region Search the address
GoogleMaps service = ServiceGenerator.createService(GoogleMaps.class, "http://maps.googleapis.com"); // API URL
service.getGeocoding(edtSearch.getText().toString(), true, new Callback<GeocodeResult>() {
@Override
public void success(GeocodeResult googleGeocodingResult, Response response) {
hideProgress();
geocodingResult = googleGeocodingResult;
if (geocodingResult.getResults().size() > 0) {
loadResult();
} else {
Toast.makeText(MainActivity.this, "Didn't find a place.", Toast.LENGTH_SHORT).show();
}
}
@Override
public void failure(RetrofitError error) {
hideProgress();
Toast.makeText(MainActivity.this, error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
//endregion
}
private void loadResult() {
listView.setVisibility(View.VISIBLE);
listView.setAdapter(new Adapter(MainActivity.this, geocodingResult.getResults()));
}
//endregion
//region Progress Dialog
private void showProgress() {
if (dialogProgress == null) {
dialogProgress = new Dialog(this);
dialogProgress.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialogProgress.setContentView(R.layout.custom_progress);
dialogProgress.setCancelable(false);
}
dialogProgress.getWindow().getDecorView().getRootView();
dialogProgress.show();
}
private void hideProgress() {
if (dialogProgress != null) {
dialogProgress.dismiss();
dialogProgress = null;
}
}
//endregion
//region Menu
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_main, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == R.id.save){
Intent intent = new Intent(getApplicationContext(), Query.class);
intent.putExtra(RESULT, geocodingResult);
startActivity(intent);
}
return super.onOptionsItemSelected(item);
}
查询：
import static com.arthurabreu.memorableplaces.MainActivity.RESULT;
import static com.arthurabreu.memorableplaces.MainActivity.SELECTED_POSITION;
/**
* Created by blitz on 4/8/2017.
*/
public class Query extends AppCompatActivity {
private ListView list;
private GeocodeResult geocodingResult;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_view_query);
DBController crud = new DBController(getBaseContext());
Cursor cursor = crud.loadData();
String[] titles = new String[] {SQLite.ID, SQLite.KEY_TITLE};
int[] idViews = new int[] {R.id.idNumber, R.id.idTitle};
SimpleCursorAdapter adapter = new SimpleCursorAdapter(getBaseContext(),
R.layout.adapter_query_layout,cursor,titles,idViews, 0);
list = (ListView)findViewById(R.id.listView);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
final Cursor c = ((SimpleCursorAdapter)list.getAdapter()).getCursor();
c.moveToPosition(position);
String place = c.getString(1); //Get the name of the place saved in the cursor
Log.d("TEST", String.valueOf(c.getString(1)));
//region Search the address
GoogleMaps service = ServiceGenerator.createService(GoogleMaps.class, "http://maps.googleapis.com"); // API URL
service.getGeocoding(place, true, new Callback<GeocodeResult>() {
@Override
public void success(GeocodeResult googleGeocodingResult, Response response) {
geocodingResult = googleGeocodingResult;
if (geocodingResult.getResults().size() > 0) {
Intent intent = new Intent(getApplicationContext(), MapActivity.class);
intent.putExtra(RESULT, geocodingResult);
intent.putExtra(SELECTED_POSITION, position);
Log.d("POSITION", String.valueOf(position));
startActivity(intent);
} else {
Toast.makeText(getApplicationContext(), "Didn't find a place.", Toast.LENGTH_SHORT).show();
}
}
@Override
public void failure(RetrofitError error) {
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
//endregion
}// END ON CLICK
});
}// END ONCREATE
}// ENDMAIN
答案 0 :(得分：1)
当编码无法达到特定索引时，就会出现错误。您可以查看thread。
IndexOutOfBound异常意味着您遇到了问题，因为您尝试访问的索引不存在或为空（非空）。例如，如果您有一个只有两个元素的数组，那么它只有索引0和1，并且您尝试访问索引2，您将获得IndexOutOfBoundException，因为索引2不存在。如果您创建一个包含10个元素且仅填充5的数组，则索引4-9将为空，访问这些元素可能会导致IndexOutOfBoundException。
以下是解决此问题的可能解决方法：
如果您正在使用IDE，则可以通过删除throws语句来帮助您调试问题。抛出陈述＆＃34;推卸责任＆＃34;当涉及到异常时，您实际上并没有通过使用throws来处理异常。 Try-catch语句更好地处理异常，因为它们缩小了问题所在的区域（因为它们测试了试验括号内的代码。
抛出它们的位置，但是为了调试try-catch可能会更有帮助。
其他参考资料：