java.lang.IndexOutOfBoundsException: 索引 8 无效，滚动 wifi 结果列表视图时大小为 0
java.lang.IndexOutOfBoundsException: Invalid index 8, size is 0 while scrolling wifi results listview
大家好，下面是我的工作 wifi 连接和列表视图的结果希望他们能帮助需要它的人，我只是在滚动列表视图上遇到问题 java.lang.IndexOutOfBoundsException: Invalid index 8, size is 0
在 !=null 通知数据集在不同线程中更改并在放入它之前清除数组列表之后，我为该设置适配器尝试了太多，但它们中的 none 有效。请帮忙！！！！
public class SaveItems extends Activity {
ListView listView;
HashMap arrayList ;
HashMap<String, String> item;
int size = 0;
List<ScanResult> results;
String ITEM_KEY = "key";
ArrayList<HashMap<String, String>> arraylist = new ArrayList<HashMap<String, String>>();
ArrayList<HashMap<String, String>> arraylist2 = new ArrayList<HashMap<String, String>>();
SimpleAdapter adapter;
WifiManager wifi;
Button buttonscan;
ProgressDialog dialog;
private EditText pass;
private String checkPassword = null;
TextView wifiname;
boolean Isnetwork;
boolean wifiEnabled;
Handler handler;
Timer timer;
Timer timer2;
private WifiReceiver wifiReceiver = new WifiReceiver();
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.ave_items);
registerReceiver(wifiReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
listView = (ListView)findViewById(R.id.lists);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
int pos = arg0.getPositionForView(arg1);
Toast.makeText(getApplicationContext(), "Clicked " + pos, Toast.LENGTH_SHORT).show();
wifiname.setText(results.get(pos).SSID);
Log.d("SizeOrig", results.size() + "");
Log.d("SizepPos", pos + "");
int hello_size = results.size();
if (hello_size - 1 == pos) {
connectToWifi(hello_size - (pos + 1));
Log.d("hello_his","lastitem");
} else {
connectToWifi(hello_size - (pos + 1));
}
}
});
this.adapter = new SimpleAdapter(SaveItems.this, arraylist, R.layout.row, new String[] { ITEM_KEY }, new int[] { R.id.list_value });
if (arrayList!=null){
if (arrayList.size()!=0) {
listView.setAdapter(this.adapter);
}}
if(listView.getAdapter()==null)
listView.setAdapter(adapter);
else{
adapter.notifyDataSetChanged();
}
}
public void newWifiResults() {
dialog.dismiss();
timer2 = new Timer();
timer2.schedule(new TimerTask() {
@Override
public void run() {
runOnUiThread(new Runnable() {
@Override
public void run() {
wifi.startScan();
try
{
size = size - 1;
while (size >= 0)
{
item = new HashMap<String, String>();
item.put(ITEM_KEY, results.get(size).SSID + " " + results.get(size).capabilities.substring(0,results.get(size).capabilities.indexOf("[")));
arraylist.add(item);
size--;
adapter.notifyDataSetChanged();
}
}
catch (Exception e)
{ }
}
});
}
}, 0, 20000);
}
private void finallyConnect(String checkPassword, int position) {
String networkSSID = results.get(position).SSID;
String networkPass = checkPassword;
WifiConfiguration wifiConfig = new WifiConfiguration();
wifiConfig.SSID = String.format("\"%s\"", networkSSID);
wifiConfig.preSharedKey = String.format("\"%s\"", networkPass);
// remember id
int netId = wifi.addNetwork(wifiConfig);
wifi.disconnect();
wifi.enableNetwork(netId, true);
wifi.reconnect();
WifiConfiguration conf = new WifiConfiguration();
conf.SSID = "\"\"" + networkSSID + "\"\"";
conf.preSharedKey = "\"" + networkPass + "\"";
wifi.addNetwork(conf);
}
private void connectToWifi(final int position) {
Log.d("position",position+"");
final Dialog dialog = new Dialog(SaveItems.this);
dialog.setContentView(R.layout.connect);
dialog.setTitle("Connect to Network");
TextView textSSID = (TextView) dialog.findViewById(R.id.textSSID1);
TextView textBSSID = (TextView) dialog.findViewById(R.id.textBSSID1);
TextView capabilities = (TextView) dialog
.findViewById(R.id.textCapabilities);
Button dialogButton = (Button) dialog.findViewById(R.id.okButton);
pass = (EditText) dialog.findViewById(R.id.textPassword);
String inner_pos=results.get(position).SSID;
Log.d("inner_pos",inner_pos);
textSSID.setText(results.get(position).SSID);
textBSSID.setText(results.get(position).BSSID);
capabilities.setText(results.get(position).capabilities);
//
// if button is clicked, connect to the network;
dialogButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checkPassword = pass.getText().toString();
finallyConnect(checkPassword, position);
dialog.dismiss();
}
});
dialog.show();
}
public void onPause() {
super.onPause();
if (wifiReceiver!=null) {
unregisterReceiver(wifiReceiver);
wifiReceiver=null;
}
}
public void onResume(){
super.onResume();
try{
registerReceiver(wifiReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));}
catch (Exception e){
}
}
public void onDestroy(){
super.onDestroy();
if (wifiReceiver!=null) {
unregisterReceiver(wifiReceiver);
wifiReceiver=null;
}
}
public class WifiReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// We are only listening for one type of intent, no verifying necessary
arraylist.clear();
results = wifi.getScanResults();
size = results.size();
newWifiResults();
}
}}
如果 arraylist 是您要传递给适配器的 ArrayList，那么您必须在清除 WifiReceiver BroadCastReciever class 中的 arraylist.clear() 后调用 adapter.notifyDataSetChanged()，因为您的视图已创建，但之后您的 ArrayList 所有对象都已从您的 arrayList 中删除试试这个：
public class WifiReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// We are only listening for one type of intent, no verifying necessary
arraylist.clear();
adapter.notifyDataSetChanged()
results = wifi.getScanResults();
size = results.size();
newWifiResults();
}
}
保存项目：
public class SaveItems extends Activity {
ListView listView;
HashMap arrayList;
HashMap<String, String> item;
int size = 0;
List<ScanResult> results;
String ITEM_KEY = "key";
ArrayList<HashMap<String, String>> arraylist = new ArrayList<HashMap<String, String>>();
ArrayList<HashMap<String, String>> arraylist2 = new ArrayList<HashMap<String, String>>();
SimpleAdapter adapter;
WifiManager wifi;
Button buttonscan;
ProgressDialog dialog;
private EditText pass;
private String checkPassword = null;
TextView wifiname;
boolean Isnetwork;
boolean wifiEnabled;
Handler handler;
Timer timer;
Timer timer2;
private WifiReceiver wifiReceiver = new WifiReceiver();
private int lastViewedPosition = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ave_items);
registerReceiver(wifiReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
listView = (ListView) findViewById(R.id.lists);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
int pos = arg0.getPositionForView(arg1);
Toast.makeText(getApplicationContext(), "Clicked " + pos, Toast.LENGTH_SHORT).show();
wifiname.setText(results.get(pos).SSID);
Log.d("SizeOrig", results.size() + "");
Log.d("SizepPos", pos + "");
int hello_size = results.size();
if (hello_size - 1 == pos) {
connectToWifi(hello_size - (pos + 1));
Log.d("hello_his", "lastitem");
} else {
connectToWifi(hello_size - (pos + 1));
}
}
});
this.adapter = new SimpleAdapter(SaveItems.this, arraylist, R.layout.row, new String[]{ITEM_KEY}, new int[]{R.id.list_value}) {
@Override
public View getView(int position, View convertView, ViewGroup parent) {
lastViewedPosition = position;
return super.getView(position, convertView, parent);
}
};
if (arrayList != null) {
if (arrayList.size() != 0) {
listView.setAdapter(this.adapter);
}
}
if (listView.getAdapter() == null)
listView.setAdapter(adapter);
else {
adapter.notifyDataSetChanged();
}
}
public void newWifiResults() {
dialog.dismiss();
timer2 = new Timer();
timer2.schedule(new TimerTask() {
@Override
public void run() {
runOnUiThread(new Runnable() {
@Override
public void run() {
wifi.startScan();
try {
size = size - 1;
while (size >= 0) {
item = new HashMap<String, String>();
item.put(ITEM_KEY, results.get(size).SSID + " " + results.get(size).capabilities.substring(0, results.get(size).capabilities.indexOf("[")));
arraylist.add(item);
size--;
adapter.notifyDataSetChanged();
}
} catch (Exception e) {
}
}
});
}
}, 0, 20000);
}
private void finallyConnect(String checkPassword, int position) {
String networkSSID = results.get(position).SSID;
String networkPass = checkPassword;
WifiConfiguration wifiConfig = new WifiConfiguration();
wifiConfig.SSID = String.format("\"%s\"", networkSSID);
wifiConfig.preSharedKey = String.format("\"%s\"", networkPass);
// remember id
int netId = wifi.addNetwork(wifiConfig);
wifi.disconnect();
wifi.enableNetwork(netId, true);
wifi.reconnect();
WifiConfiguration conf = new WifiConfiguration();
conf.SSID = "\"\"" + networkSSID + "\"\"";
conf.preSharedKey = "\"" + networkPass + "\"";
wifi.addNetwork(conf);
}
private void connectToWifi(final int position) {
Log.d("position", position + "");
final Dialog dialog = new Dialog(SaveItems.this);
dialog.setContentView(R.layout.connect);
dialog.setTitle("Connect to Network");
TextView textSSID = (TextView) dialog.findViewById(R.id.textSSID1);
TextView textBSSID = (TextView) dialog.findViewById(R.id.textBSSID1);
TextView capabilities = (TextView) dialog
.findViewById(R.id.textCapabilities);
Button dialogButton = (Button) dialog.findViewById(R.id.okButton);
pass = (EditText) dialog.findViewById(R.id.textPassword);
String inner_pos = results.get(position).SSID;
Log.d("inner_pos", inner_pos);
textSSID.setText(results.get(position).SSID);
textBSSID.setText(results.get(position).BSSID);
capabilities.setText(results.get(position).capabilities);
//
// if button is clicked, connect to the network;
dialogButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checkPassword = pass.getText().toString();
finallyConnect(checkPassword, position);
dialog.dismiss();
}
});
dialog.show();
}
public void onPause() {
super.onPause();
if (wifiReceiver != null) {
unregisterReceiver(wifiReceiver);
wifiReceiver = null;
}
}
public void onResume() {
super.onResume();
try {
registerReceiver(wifiReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
} catch (Exception e) {
}
}
public void onDestroy() {
super.onDestroy();
if (wifiReceiver != null) {
unregisterReceiver(wifiReceiver);
wifiReceiver = null;
}
}
public class WifiReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// We are only listening for one type of intent, no verifying necessary
arraylist.clear();
adapter.notifyDataSetChanged(;
listView.setSelection(lastViewedPosition);
lastViewedPosition = 0
results = wifi.getScanResults();
size = results.size();
newWifiResults();
}
}
}
大家好，下面是我的工作 wifi 连接和列表视图的结果希望他们能帮助需要它的人，我只是在滚动列表视图上遇到问题 java.lang.IndexOutOfBoundsException: Invalid index 8, size is 0
在 !=null 通知数据集在不同线程中更改并在放入它之前清除数组列表之后，我为该设置适配器尝试了太多，但它们中的 none 有效。请帮忙！！！！
public class SaveItems extends Activity {
ListView listView;
HashMap arrayList ;
HashMap<String, String> item;
int size = 0;
List<ScanResult> results;
String ITEM_KEY = "key";
ArrayList<HashMap<String, String>> arraylist = new ArrayList<HashMap<String, String>>();
ArrayList<HashMap<String, String>> arraylist2 = new ArrayList<HashMap<String, String>>();
SimpleAdapter adapter;
WifiManager wifi;
Button buttonscan;
ProgressDialog dialog;
private EditText pass;
private String checkPassword = null;
TextView wifiname;
boolean Isnetwork;
boolean wifiEnabled;
Handler handler;
Timer timer;
Timer timer2;
private WifiReceiver wifiReceiver = new WifiReceiver();
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.ave_items);
registerReceiver(wifiReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
listView = (ListView)findViewById(R.id.lists);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
int pos = arg0.getPositionForView(arg1);
Toast.makeText(getApplicationContext(), "Clicked " + pos, Toast.LENGTH_SHORT).show();
wifiname.setText(results.get(pos).SSID);
Log.d("SizeOrig", results.size() + "");
Log.d("SizepPos", pos + "");
int hello_size = results.size();
if (hello_size - 1 == pos) {
connectToWifi(hello_size - (pos + 1));
Log.d("hello_his","lastitem");
} else {
connectToWifi(hello_size - (pos + 1));
}
}
});
this.adapter = new SimpleAdapter(SaveItems.this, arraylist, R.layout.row, new String[] { ITEM_KEY }, new int[] { R.id.list_value });
if (arrayList!=null){
if (arrayList.size()!=0) {
listView.setAdapter(this.adapter);
}}
if(listView.getAdapter()==null)
listView.setAdapter(adapter);
else{
adapter.notifyDataSetChanged();
}
}
public void newWifiResults() {
dialog.dismiss();
timer2 = new Timer();
timer2.schedule(new TimerTask() {
@Override
public void run() {
runOnUiThread(new Runnable() {
@Override
public void run() {
wifi.startScan();
try
{
size = size - 1;
while (size >= 0)
{
item = new HashMap<String, String>();
item.put(ITEM_KEY, results.get(size).SSID + " " + results.get(size).capabilities.substring(0,results.get(size).capabilities.indexOf("[")));
arraylist.add(item);
size--;
adapter.notifyDataSetChanged();
}
}
catch (Exception e)
{ }
}
});
}
}, 0, 20000);
}
private void finallyConnect(String checkPassword, int position) {
String networkSSID = results.get(position).SSID;
String networkPass = checkPassword;
WifiConfiguration wifiConfig = new WifiConfiguration();
wifiConfig.SSID = String.format("\"%s\"", networkSSID);
wifiConfig.preSharedKey = String.format("\"%s\"", networkPass);
// remember id
int netId = wifi.addNetwork(wifiConfig);
wifi.disconnect();
wifi.enableNetwork(netId, true);
wifi.reconnect();
WifiConfiguration conf = new WifiConfiguration();
conf.SSID = "\"\"" + networkSSID + "\"\"";
conf.preSharedKey = "\"" + networkPass + "\"";
wifi.addNetwork(conf);
}
private void connectToWifi(final int position) {
Log.d("position",position+"");
final Dialog dialog = new Dialog(SaveItems.this);
dialog.setContentView(R.layout.connect);
dialog.setTitle("Connect to Network");
TextView textSSID = (TextView) dialog.findViewById(R.id.textSSID1);
TextView textBSSID = (TextView) dialog.findViewById(R.id.textBSSID1);
TextView capabilities = (TextView) dialog
.findViewById(R.id.textCapabilities);
Button dialogButton = (Button) dialog.findViewById(R.id.okButton);
pass = (EditText) dialog.findViewById(R.id.textPassword);
String inner_pos=results.get(position).SSID;
Log.d("inner_pos",inner_pos);
textSSID.setText(results.get(position).SSID);
textBSSID.setText(results.get(position).BSSID);
capabilities.setText(results.get(position).capabilities);
//
// if button is clicked, connect to the network;
dialogButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checkPassword = pass.getText().toString();
finallyConnect(checkPassword, position);
dialog.dismiss();
}
});
dialog.show();
}
public void onPause() {
super.onPause();
if (wifiReceiver!=null) {
unregisterReceiver(wifiReceiver);
wifiReceiver=null;
}
}
public void onResume(){
super.onResume();
try{
registerReceiver(wifiReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));}
catch (Exception e){
}
}
public void onDestroy(){
super.onDestroy();
if (wifiReceiver!=null) {
unregisterReceiver(wifiReceiver);
wifiReceiver=null;
}
}
public class WifiReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// We are only listening for one type of intent, no verifying necessary
arraylist.clear();
results = wifi.getScanResults();
size = results.size();
newWifiResults();
}
}}
如果 arraylist 是您要传递给适配器的 ArrayList，那么您必须在清除 WifiReceiver BroadCastReciever class 中的 arraylist.clear() 后调用 adapter.notifyDataSetChanged()，因为您的视图已创建，但之后您的 ArrayList 所有对象都已从您的 arrayList 中删除试试这个：
public class WifiReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// We are only listening for one type of intent, no verifying necessary
arraylist.clear();
adapter.notifyDataSetChanged()
results = wifi.getScanResults();
size = results.size();
newWifiResults();
}
}
保存项目：
public class SaveItems extends Activity {
ListView listView;
HashMap arrayList;
HashMap<String, String> item;
int size = 0;
List<ScanResult> results;
String ITEM_KEY = "key";
ArrayList<HashMap<String, String>> arraylist = new ArrayList<HashMap<String, String>>();
ArrayList<HashMap<String, String>> arraylist2 = new ArrayList<HashMap<String, String>>();
SimpleAdapter adapter;
WifiManager wifi;
Button buttonscan;
ProgressDialog dialog;
private EditText pass;
private String checkPassword = null;
TextView wifiname;
boolean Isnetwork;
boolean wifiEnabled;
Handler handler;
Timer timer;
Timer timer2;
private WifiReceiver wifiReceiver = new WifiReceiver();
private int lastViewedPosition = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ave_items);
registerReceiver(wifiReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
listView = (ListView) findViewById(R.id.lists);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
int pos = arg0.getPositionForView(arg1);
Toast.makeText(getApplicationContext(), "Clicked " + pos, Toast.LENGTH_SHORT).show();
wifiname.setText(results.get(pos).SSID);
Log.d("SizeOrig", results.size() + "");
Log.d("SizepPos", pos + "");
int hello_size = results.size();
if (hello_size - 1 == pos) {
connectToWifi(hello_size - (pos + 1));
Log.d("hello_his", "lastitem");
} else {
connectToWifi(hello_size - (pos + 1));
}
}
});
this.adapter = new SimpleAdapter(SaveItems.this, arraylist, R.layout.row, new String[]{ITEM_KEY}, new int[]{R.id.list_value}) {
@Override
public View getView(int position, View convertView, ViewGroup parent) {
lastViewedPosition = position;
return super.getView(position, convertView, parent);
}
};
if (arrayList != null) {
if (arrayList.size() != 0) {
listView.setAdapter(this.adapter);
}
}
if (listView.getAdapter() == null)
listView.setAdapter(adapter);
else {
adapter.notifyDataSetChanged();
}
}
public void newWifiResults() {
dialog.dismiss();
timer2 = new Timer();
timer2.schedule(new TimerTask() {
@Override
public void run() {
runOnUiThread(new Runnable() {
@Override
public void run() {
wifi.startScan();
try {
size = size - 1;
while (size >= 0) {
item = new HashMap<String, String>();
item.put(ITEM_KEY, results.get(size).SSID + " " + results.get(size).capabilities.substring(0, results.get(size).capabilities.indexOf("[")));
arraylist.add(item);
size--;
adapter.notifyDataSetChanged();
}
} catch (Exception e) {
}
}
});
}
}, 0, 20000);
}
private void finallyConnect(String checkPassword, int position) {
String networkSSID = results.get(position).SSID;
String networkPass = checkPassword;
WifiConfiguration wifiConfig = new WifiConfiguration();
wifiConfig.SSID = String.format("\"%s\"", networkSSID);
wifiConfig.preSharedKey = String.format("\"%s\"", networkPass);
// remember id
int netId = wifi.addNetwork(wifiConfig);
wifi.disconnect();
wifi.enableNetwork(netId, true);
wifi.reconnect();
WifiConfiguration conf = new WifiConfiguration();
conf.SSID = "\"\"" + networkSSID + "\"\"";
conf.preSharedKey = "\"" + networkPass + "\"";
wifi.addNetwork(conf);
}
private void connectToWifi(final int position) {
Log.d("position", position + "");
final Dialog dialog = new Dialog(SaveItems.this);
dialog.setContentView(R.layout.connect);
dialog.setTitle("Connect to Network");
TextView textSSID = (TextView) dialog.findViewById(R.id.textSSID1);
TextView textBSSID = (TextView) dialog.findViewById(R.id.textBSSID1);
TextView capabilities = (TextView) dialog
.findViewById(R.id.textCapabilities);
Button dialogButton = (Button) dialog.findViewById(R.id.okButton);
pass = (EditText) dialog.findViewById(R.id.textPassword);
String inner_pos = results.get(position).SSID;
Log.d("inner_pos", inner_pos);
textSSID.setText(results.get(position).SSID);
textBSSID.setText(results.get(position).BSSID);
capabilities.setText(results.get(position).capabilities);
//
// if button is clicked, connect to the network;
dialogButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checkPassword = pass.getText().toString();
finallyConnect(checkPassword, position);
dialog.dismiss();
}
});
dialog.show();
}
public void onPause() {
super.onPause();
if (wifiReceiver != null) {
unregisterReceiver(wifiReceiver);
wifiReceiver = null;
}
}
public void onResume() {
super.onResume();
try {
registerReceiver(wifiReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
} catch (Exception e) {
}
}
public void onDestroy() {
super.onDestroy();
if (wifiReceiver != null) {
unregisterReceiver(wifiReceiver);
wifiReceiver = null;
}
}
public class WifiReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// We are only listening for one type of intent, no verifying necessary
arraylist.clear();
adapter.notifyDataSetChanged(;
listView.setSelection(lastViewedPosition);
lastViewedPosition = 0
results = wifi.getScanResults();
size = results.size();
newWifiResults();
}
}
}