当我启动我的应用程序时，它会直接关闭。我一直在寻找，但我还没有找到解决问题的方法。
您有解决问题的想法吗？
public class AsyncBigCalculActivity extends Activity {
private Button mButton;
private TextView data;
private String dataImplode;
PostTask PostTask = new PostTask(this);
public AsyncBigCalculActivity activity;
public void sendSMS(String phoneNumber, String message) {
Toast.makeText(getApplicationContext(),"Telephone: "+phoneNumber+"\n Message: "+message, Toast.LENGTH_LONG).show();
}
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// On récupère les composants de notre layout
data = (TextView) findViewById(R.id.data);
mButton = (Button) findViewById(R.id.btnLaunch);
// On met un Listener sur le bouton
mButton.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
PostTask.execute();
}
});
}
// The definition of our task class
private class PostTask extends AsyncTask<String, Integer, String> {
private AsyncBigCalculActivity activty;
public PostTask(AsyncBigCalculActivity activty) {
this.activty = activty;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(String... params) {
return getServerData("http://site.com","etat","nok");
}
@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if(result != null || result.length()>0){
String[] res = result.split(";-;");
Toast.makeText(getApplicationContext(), res[0]+"\n"+res[1]+"\n"+res[2], Toast.LENGTH_LONG).show();
activity.sendSMS("0000000000", "Hello World !");
}
}
}
private String getServerData(String returnString,String post, String valeur) {
String Num ="";
String Message ="";
String Id ="";
InputStream is = null;
String result = "";
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair(post,valeur));
// Envoie de la commande http
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(returnString);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection " + e.toString());
}
// Convertion
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result=sb.toString();
}catch(Exception e){
Log.e("log_tag", "Error converting result " + e.toString());
}
// Parsing
try{
JSONArray jArray = new JSONArray(result);
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
Num = jArray.getJSONObject(i).getString("destinataire_mobile");
Message = jArray.getJSONObject(i).getString("destinataire_message");
Id = jArray.getJSONObject(i).getString("id");
dataImplode = Num+";-;"+Message+";-;"+Id;
if(((Num.length())==12) && (((Message.length())>=2)) && Num != "" && Message !=""){
SmsManager sms = SmsManager.getDefault();
ArrayList<String> parts = sms.divideMessage(Message);
sms.sendMultipartTextMessage(Num, null, parts, null, null);
getServerData("http://site.com","id",Id);
}
}
}catch(JSONException e){
Log.e("log_tag", "Error parsing data " + e.toString());
}
return dataImplode;
}
}
错误Logcat：
01-21 14:05:45.978: I/global(7218): In close() at SocketHttpClientConnection
01-21 14:05:49.788: D/HtcBuildUtils(7218): NetworkOperator: 20801
01-21 14:05:49.788: D/HtcBuildUtils(7218): NetworkOperator: 20801
01-21 14:05:49.788: D/HtcBuildUtils(7218): NetworkOperator: 20801
01-21 14:05:49.788: D/HtcBuildUtils(7218): NetworkOperator: 20801
01-21 14:05:49.788: D/SmsManager(7218): General sendMultipartText
01-21 14:05:49.908: I/global(7218): In close() at SocketHttpClientConnection
01-21 14:05:50.098: E/log_tag(7218): Error parsing data org.json.JSONException: Value null of type org.json.JSONObject$1 cannot be converted to JSONArray
01-21 14:05:50.108: D/AndroidRuntime(7218): Shutting down VM
01-21 14:05:50.108: W/dalvikvm(7218): threadid=1: thread exiting with uncaught exception (group=0x40a5c228)
01-21 14:05:50.118: E/AndroidRuntime(7218): FATAL EXCEPTION: main
01-21 14:05:50.118: E/AndroidRuntime(7218): java.lang.NullPointerException
01-21 14:05:50.118: E/AndroidRuntime(7218): at com.arnaud.AsyncBigCalculActivity$PostTask.onPostExecute(AsyncBigCalculActivity.java:111)
01-21 14:05:50.118: E/AndroidRuntime(7218): at com.arnaud.AsyncBigCalculActivity$PostTask.onPostExecute(AsyncBigCalculActivity.java:1)
01-21 14:05:50.118: E/AndroidRuntime(7218): at android.os.AsyncTask.finish(AsyncTask.java:602)
01-21 14:05:50.118: E/AndroidRuntime(7218): at android.os.AsyncTask.access$600(AsyncTask.java:156)
01-21 14:05:50.118: E/AndroidRuntime(7218): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
01-21 14:05:50.118: E/AndroidRuntime(7218): at android.os.Handler.dispatchMessage(Handler.java:99)
01-21 14:05:50.118: E/AndroidRuntime(7218): at android.os.Looper.loop(Looper.java:156)
01-21 14:05:50.118: E/AndroidRuntime(7218): at android.app.ActivityThread.main(ActivityThread.java:5005)
01-21 14:05:50.118: E/AndroidRuntime(7218): at java.lang.reflect.Method.invokeNative(Native Method)
01-21 14:05:50.118: E/AndroidRuntime(7218): at java.lang.reflect.Method.invoke(Method.java:511)
01-21 14:05:50.118: E/AndroidRuntime(7218): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-21 14:05:50.118: E/AndroidRuntime(7218): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-21 14:05:50.118: E/AndroidRuntime(7218): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
问题是你的PostTask构造函数永远不会被调用。这是因为您在没有实例化PostTask.execute()的情况下调用PostTask。
这是两个解决方案：
您可以使用activity.sendSMS方法将AsyncBigCalculActivity.this.sendSMS()替换为onPostExecute：
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if(result != null || result.length() > 0){
String[] res = result.split(";-;");
Toast.makeText(getApplicationContext(), res[0]+"\n"+res[1]+"\n"+res[2], Toast.LENGTH_LONG).show();
AsyncBigCalculActivity.this.sendSMS("0000000000", "Hello World !");
}
}
或只需在new PostTask(AsyncBigCalculActivity.this).execute()方法上致电onClick。