我如何在另一個類中調用方法
[英]How can I call a method in another class
問題描述
我有2個類：1.公共類UltimateInfoServiceForGear擴展了SAAgent 2.公共類NotificationService擴展了NotificationListenerService
在第二堂課中，我想從第一堂課中調用一個函數：
函數是：內部類public class HelloAccessoryProviderConnection下的public void sendmydata （）擴展SASocket
因此，在第二堂課中，我創建了以下函數：
private void senddata(UltimateInfoServiceForGear.HelloAccessoryProviderConnection param) {
param.sendmydata();
}
然后，從我的主要函數中調用它：
try {
senddata(UltimateInfoServiceForGear.HelloAccessoryProviderConnection.class.newInstance());
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
但是，在這里，newInstance不起作用。
我收到以下錯誤：
10-27 22:34:01.563: D/dalvikvm(4973): newInstance failed: no <init>()
10-27 22:34:01.563: W/System.err(4973): java.lang.InstantiationException: can't instantiate class com.gearwatch.ultimateinfoserviceforgear.service.UltimateInfoServiceForGear$HelloAccessoryProviderConnection; no empty constructor
10-27 22:34:01.563: W/System.err(4973): at java.lang.Class.newInstanceImpl(Native Method)
10-27 22:34:01.563: W/System.err(4973): at java.lang.Class.newInstance(Class.java:1208)
10-27 22:34:01.563: W/System.err(4973): at com.gearwatch.ultimateinfoserviceforgear.service.NotificationService.onNotificationRemoved(NotificationService.java:85)
10-27 22:34:01.563: W/System.err(4973): at android.service.notification.NotificationListenerService$INotificationListenerWrapper.onNotificationRemoved(NotificationListenerService.java:176)
10-27 22:34:01.563: W/System.err(4973): at android.service.notification.INotificationListener$Stub.onTransact(INotificationListener.java:69)
10-27 22:34:01.563: W/System.err(4973): at android.os.Binder.execTransact(Binder.java:404)
10-27 22:34:01.573: W/System.err(4973): at dalvik.system.NativeStart.run(Native Method)
10-27 22:34:01.583: D/SAAgent(4973): intent Actionandroid.accessory.service.action.ACCESSORY_SERVICE_CONNECTION_IND : Thread Name UltmateInfoServiceForGear
我的代碼有什么問題？ 我如何在其他課堂上稱呼功能？
這是課程：
public class HelloAccessoryProviderConnection extends SASocket {
private int mConnectionId;
public HelloAccessoryProviderConnection() {
super(HelloAccessoryProviderConnection.class.getName());
}
@Override
public void onError(int channelId, String errorString, int error) {
}
@Override
public void onReceive(int channelId, byte[] data) {
String receivedStr = new String(data);
String messagex = new String();
String weatherforecast="";
String m="0";
String w="0";
if (receivedStr.equals("battery")){
ConnectivityManager conMan = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
State mobile = conMan.getNetworkInfo(0).getState();
State wifi = conMan.getNetworkInfo(1).getState();
if (mobile == android.net.NetworkInfo.State.CONNECTED || mobile == android.net.NetworkInfo.State.CONNECTING)
{
m="1";
}
if (wifi == android.net.NetworkInfo.State.CONNECTED || wifi == android.net.NetworkInfo.State.CONNECTING)
{
w="1";
}
messagex = "battery|:" + w + "|:" + m + "|:" + String.valueOf(level) + "|:" + String.valueOf(nc);
} else if (receivedStr.equals("won")){
ConnectivityManager conMan = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
wifiManager.setWifiEnabled(true);
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
State mobile = conMan.getNetworkInfo(0).getState();
State wifi = conMan.getNetworkInfo(1).getState();
if (mobile == android.net.NetworkInfo.State.CONNECTED || mobile == android.net.NetworkInfo.State.CONNECTING)
{
m="1";
}
if (wifi == android.net.NetworkInfo.State.CONNECTED || wifi == android.net.NetworkInfo.State.CONNECTING)
{
w="1";
} else {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
wifi = conMan.getNetworkInfo(1).getState();
if (wifi == android.net.NetworkInfo.State.CONNECTED || wifi == android.net.NetworkInfo.State.CONNECTING)
{
w="1";
} else {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
wifi = conMan.getNetworkInfo(1).getState();
if (wifi == android.net.NetworkInfo.State.CONNECTED || wifi == android.net.NetworkInfo.State.CONNECTING)
{
w="1";
}
else { w="2";}
}
}
messagex = "battery|:" + w + "|:" + m + "|:" + String.valueOf(level) + "|:" + String.valueOf(nc);
} else if (receivedStr.equals("woff")){
ConnectivityManager conMan = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
wifiManager.setWifiEnabled(false);
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
State mobile = conMan.getNetworkInfo(0).getState();
State wifi = conMan.getNetworkInfo(1).getState();
if (mobile == android.net.NetworkInfo.State.CONNECTED || mobile == android.net.NetworkInfo.State.CONNECTING)
{
m="1";
}
if (wifi == android.net.NetworkInfo.State.CONNECTED || wifi == android.net.NetworkInfo.State.CONNECTING)
{
w="1";
}
messagex = "battery|:" + w + "|:" + m + "|:" + String.valueOf(level) + "|:" + String.valueOf(nc);
} else if (receivedStr.equals("don")){
ConnectivityManager conMan = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
try {
Class conmanClass;
conmanClass = Class.forName(conMan.getClass().getName());
final Field iConnectivityManagerField = conmanClass.getDeclaredField("mService");
iConnectivityManagerField.setAccessible(true);
final Object iConnectivityManager = iConnectivityManagerField.get(conMan);
final Class iConnectivityManagerClass = Class.forName(iConnectivityManager.getClass().getName());
final Method setMobileDataEnabledMethod = iConnectivityManagerClass.getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
setMobileDataEnabledMethod.setAccessible(true);
setMobileDataEnabledMethod.invoke(iConnectivityManager, true);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
State mobile = conMan.getNetworkInfo(0).getState();
State wifi = conMan.getNetworkInfo(1).getState();
if (mobile == android.net.NetworkInfo.State.CONNECTED || mobile == android.net.NetworkInfo.State.CONNECTING)
{
m="1";
}
if (wifi == android.net.NetworkInfo.State.CONNECTED || wifi == android.net.NetworkInfo.State.CONNECTING)
{
w="1";
}
messagex = "battery|:" + w + "|:" + m + "|:" + String.valueOf(level) + "|:" + String.valueOf(nc);
} else if (receivedStr.equals("doff")){
ConnectivityManager conMan = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
try {
Class conmanClass;
conmanClass = Class.forName(conMan.getClass().getName());
final Field iConnectivityManagerField = conmanClass.getDeclaredField("mService");
iConnectivityManagerField.setAccessible(true);
final Object iConnectivityManager = iConnectivityManagerField.get(conMan);
final Class iConnectivityManagerClass = Class.forName(iConnectivityManager.getClass().getName());
final Method setMobileDataEnabledMethod = iConnectivityManagerClass.getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
setMobileDataEnabledMethod.setAccessible(true);
setMobileDataEnabledMethod.invoke(iConnectivityManager, false);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
State mobile = conMan.getNetworkInfo(0).getState();
State wifi = conMan.getNetworkInfo(1).getState();
if (mobile == android.net.NetworkInfo.State.CONNECTED || mobile == android.net.NetworkInfo.State.CONNECTING)
{
m="1";
}
if (wifi == android.net.NetworkInfo.State.CONNECTED || wifi == android.net.NetworkInfo.State.CONNECTING)
{
w="1";
}
messagex = "battery|:" + w + "|:" + m + "|:" + String.valueOf(level) + "|:" + String.valueOf(nc);
} else if (receivedStr.equals("calendar")) {
String cevent = readCalendarEvent(getBaseContext());
messagex = "calendar|:"+ cevent;
} else if (receivedStr.equals("location")) {
if (loc!=null) {
Geocoder gcd = new Geocoder(getBaseContext(),Locale.getDefault());
List<Address> addresses;
try {
addresses = gcd.getFromLocation(loc.getLatitude(), loc.getLongitude(), 5);
if (addresses != null && addresses.size() > 0)
//System.out.println(addresses.get(0).getLocality());
cityName=addresses.get(0).getLocality();
if (cityName==null) cityName="";
SimpleDateFormat format = new SimpleDateFormat("HH:mm");
ltime = format.format(loc.getTime());
lp = loc.getProvider();
try {weatherforecast=getWeatherT(getWeatherTData(loc.getLatitude(), loc.getLongitude()));
} catch (JSONException e) {
e.printStackTrace();
}
/*
try {weathernow=getWeather(getWeatherData(loc.getLatitude(), loc.getLongitude()));
} catch (JSONException e) {
e.printStackTrace();
}
*/
messagex = "location|:" + cityName + "|:" + ltime + "|:" + lp + "|:" + weatherforecast; //+ "|:" + weathernow;
} catch (IOException e) {
e.printStackTrace();
messagex = "location|:" + cityName + "|: ";
}
} else { messagex = "location|:n/a";}
} else if (receivedStr.equals("batloc")) {
ConnectivityManager conMan = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
State mobile = conMan.getNetworkInfo(0).getState();
State wifi = conMan.getNetworkInfo(1).getState();
if (mobile == android.net.NetworkInfo.State.CONNECTED || mobile == android.net.NetworkInfo.State.CONNECTING)
{
m="1";
}
if (wifi == android.net.NetworkInfo.State.CONNECTED || wifi == android.net.NetworkInfo.State.CONNECTING)
{
w="1";
}
if (loc!=null) {
Geocoder gcd = new Geocoder(getBaseContext(),Locale.getDefault());
List<Address> addresses;
try {
addresses = gcd.getFromLocation(loc.getLatitude(), loc.getLongitude(), 5);
if (addresses != null && addresses.size() > 0)
//System.out.println(addresses.get(0).getLocality());
cityName=addresses.get(0).getLocality();
if (cityName==null) cityName="";
SimpleDateFormat format = new SimpleDateFormat("HH:mm");
ltime = format.format(loc.getTime());
lp = loc.getProvider();
try {weatherforecast=getWeatherT(getWeatherTData(loc.getLatitude(), loc.getLongitude()));
} catch (JSONException e) {
e.printStackTrace();
}
/*
try {weathernow=getWeather(getWeatherData(loc.getLatitude(), loc.getLongitude()));
} catch (JSONException e) {
e.printStackTrace();
}
*/
messagex = "batloc|:" + w + "|:" + m + "|:" + String.valueOf(level) + "|:" + cityName + "|:" + ltime + "|:" + lp + "|:" + weatherforecast + "|:" + String.valueOf(nc); //+ "|:" + weathernow;
} catch (IOException e) {
e.printStackTrace();
messagex = "battery|:" + w + "|:" + m + "|:" + String.valueOf(level) + "|:" + String.valueOf(nc);
}
} else { messagex = "battery|:" + w + "|:" + m + "|:" + String.valueOf(level) + "|:" + String.valueOf(nc);}
} else {
messagex = "error|:no input";
}
final String message = messagex;
Log.d(TAG, receivedStr + " " + message);
final HelloAccessoryProviderConnection uHandler = mConnectionsMap.get(Integer
.parseInt(String.valueOf(mConnectionId)));
if(uHandler == null){
return;
}
new Thread(new Runnable() {
public void run() {
try {
uHandler.send(HELLOACCESSORY_CHANNEL_ID, message.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
}
@Override
protected void onServiceConnectionLost(int errorCode) {
if (mConnectionsMap != null) {
mConnectionsMap.remove(mConnectionId);
}
}
}
謝謝。
2 個解決方案
解決方案1
0 2014-10-27 20:51:10
在類HelloAccessoryProviderConnection添加默認的空構造HelloAccessoryProviderConnection
有關此問題，請參閱接受的答案。 您的intentservice發生了完全相同的問題， 沒有空的構造函數，但是有一個構造函數
因為您的課程在另一個課程中，所以您可能必須更改修飾符。 通過問題以更好地理解。
解決方案2
0 2016-01-19 05:25:47
you can call your method...
public static void methodname(Params){
}
i.e. If it is static method then You can directly call using:
UltimateInfoServiceForGear.sendData(paramValue).
您尚未創建靜態，因此必須創建類的實例：
UltimateInfoServiceForGear ultimateInfoServiceForGear=new UltimateInfoServiceForGear();
ultimateInfoServiceForGear.sendData(paramValue);
如何從另一個類調用帶有startActivity（Intent）的方法？
[英]how can i call a method with a startActivity(Intent) from another class?
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