我的应用程序崩溃，但我不明白日志。也许在Android开发中有更多实验的人可以帮助我。我认为这是异步的问题，但我不知道如何解决这个问题。
日志
12-30 17:40:57.045: E/AndroidRuntime(26286): FATAL EXCEPTION: AsyncTask #2
12-30 17:40:57.045: E/AndroidRuntime(26286): java.lang.RuntimeException: An error occured while executing doInBackground()
12-30 17:40:57.045: E/AndroidRuntime(26286): at android.os.AsyncTask$3.done(AsyncTask.java:299)
12-30 17:40:57.045: E/AndroidRuntime(26286): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
12-30 17:40:57.045: E/AndroidRuntime(26286): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
12-30 17:40:57.045: E/AndroidRuntime(26286): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
12-30 17:40:57.045: E/AndroidRuntime(26286): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
12-30 17:40:57.045: E/AndroidRuntime(26286): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
12-30 17:40:57.045: E/AndroidRuntime(26286): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
12-30 17:40:57.045: E/AndroidRuntime(26286): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
12-30 17:40:57.045: E/AndroidRuntime(26286): at java.lang.Thread.run(Thread.java:856)
12-30 17:40:57.045: E/AndroidRuntime(26286): Caused by: java.lang.NullPointerException
12-30 17:40:57.045: E/AndroidRuntime(26286): at com.begital.votrebijoutier.ShopActivity$GetJson.doInBackground(ShopActivity.java:339)
12-30 17:40:57.045: E/AndroidRuntime(26286): at com.begital.votrebijoutier.ShopActivity$GetJson.doInBackground(ShopActivity.java:1)
12-30 17:40:57.045: E/AndroidRuntime(26286): at android.os.AsyncTask$2.call(AsyncTask.java:287)
12-30 17:40:57.045: E/AndroidRuntime(26286): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
12-30 17:40:57.045: E/AndroidRuntime(26286): ... 5 more
12-30 17:40:57.165: D/dalvikvm(26286): GC_CONCURRENT freed 1742K, 22% free 15029K/19143K, paused 2ms+17ms, total 77ms
12-30 17:40:57.715: E/WindowManager(26286): Activity com.begital.votrebijoutier.ShopActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41baa298 that was originally added here
12-30 17:40:57.715: E/WindowManager(26286): android.view.WindowLeaked: Activity com.begital.votrebijoutier.ShopActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41baa298 that was originally added here
12-30 17:40:57.715: E/WindowManager(26286): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:374)
12-30 17:40:57.715: E/WindowManager(26286): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:292)
12-30 17:40:57.715: E/WindowManager(26286): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:224)
12-30 17:40:57.715: E/WindowManager(26286): at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:149)
12-30 17:40:57.715: E/WindowManager(26286): at android.view.Window$LocalWindowManager.addView(Window.java:547)
12-30 17:40:57.715: E/WindowManager(26286): at android.app.Dialog.show(Dialog.java:277)
12-30 17:40:57.715: E/WindowManager(26286): at com.begital.votrebijoutier.ShopActivity$GetJson.onPreExecute(ShopActivity.java:187)
12-30 17:40:57.715: E/WindowManager(26286): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
12-30 17:40:57.715: E/WindowManager(26286): at android.os.AsyncTask.execute(AsyncTask.java:534)
12-30 17:40:57.715: E/WindowManager(26286): at com.begital.votrebijoutier.ShopActivity.onCreate(ShopActivity.java:169)
12-30 17:40:57.715: E/WindowManager(26286): at android.app.Activity.performCreate(Activity.java:5008)
12-30 17:40:57.715: E/WindowManager(26286): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
12-30 17:40:57.715: E/WindowManager(26286): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
12-30 17:40:57.715: E/WindowManager(26286): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
12-30 17:40:57.715: E/WindowManager(26286): at android.app.ActivityThread.access$600(ActivityThread.java:130)
12-30 17:40:57.715: E/WindowManager(26286): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
12-30 17:40:57.715: E/WindowManager(26286): at android.os.Handler.dispatchMessage(Handler.java:99)
12-30 17:40:57.715: E/WindowManager(26286): at android.os.Looper.loop(Looper.java:137)
12-30 17:40:57.715: E/WindowManager(26286): at android.app.ActivityThread.main(ActivityThread.java:4745)
12-30 17:40:57.715: E/WindowManager(26286): at java.lang.reflect.Method.invokeNative(Native Method)
12-30 17:40:57.715: E/WindowManager(26286): at java.lang.reflect.Method.invoke(Method.java:511)
12-30 17:40:57.715: E/WindowManager(26286): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
12-30 17:40:57.715: E/WindowManager(26286): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
12-30 17:40:57.715: E/WindowManager(26286): at dalvik.system.NativeStart.main(Native Method)
这是班级：
public class ShopActivity extends Activity {
private int userIcon, jewelleryIcon;
private GoogleMap theMap;
private LocationManager locMan;
private Marker userMarker;
private Marker bijouterie;
private Button emailButton;
private long latitude;
private long longitude;
private String image1;
private String image2;
private ImageButton button1;
private ImageButton button2;
private ImageButton button3;
private ImageButton button4;
private ImageButton button5;
private ImageButton catalogue;
private Button goToMap;
private String thebooketurl = null;
private String url;
private ProgressDialog pDialog;
/** Called when the activity is first created.
* @return */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_shop);
// Get url
Bundle extras = getIntent().getExtras(); if (extras == null) {
return;
}
String urlshop = extras.getString("shopurl");
String credentials = "?clientid";
url = (urlshop+credentials);
System.out.println("url --->" + url);
// Internet check
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
android.net.NetworkInfo wifi = cm
.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
android.net.NetworkInfo datac = cm
.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if ((wifi != null & datac != null)
&& (wifi.isConnected() | datac.isConnected())) {
//connection is OK
}else{
//no connection
Toast toast = Toast.makeText(ShopActivity.this, "Une erreur a été rencontrée. Veuillez vérifier votre connexion à internet",
Toast.LENGTH_LONG);
toast.show();
}
// Check status of Google Play Services
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
// Check Google Play Service Available
try {
if (status != ConnectionResult.SUCCESS) {
}
} catch (Exception e) {
Log.e("Error: GooglePlayServiceUtil: ", "" + e);
}
// Google Maps
userIcon = R.drawable.blue_point;
jewelleryIcon = R.drawable.pointeur;
if(theMap==null){
//map not instantiated yet
}
theMap = ((MapFragment)getFragmentManager().findFragmentById(R.id.the_map)).getMap();
if(theMap != null){
//ok - proceed
}
theMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
// Map
LatLng BIJOUTERIE = new LatLng(latitude, longitude);
bijouterie = theMap.addMarker(new MarkerOptions()
.position(BIJOUTERIE)
.title("Bijouterie")
.icon(BitmapDescriptorFactory.fromResource(jewelleryIcon))
.snippet("rue du Temple, Marseille"));
theMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(latitude, longitude), 7.5f), 4000, null);
// Calling async task to get json
new GetJson().execute();
}
/**
* Async task class to get json by making HTTP call
* */
private class GetJson extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(ShopActivity.this);
pDialog.setMessage("Chargement...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
// View's main buttons
goToMap = (Button)findViewById(R.id.mapClick);
goToMap.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View goToMap) {
Intent intent = new Intent(ShopActivity.this, FullMapActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.fadein, R.anim.fadeout);
}
});
button1 = (ImageButton)findViewById(R.id.imageButton1);
button1.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View Button1) {
finish();//go back to the previous Activity
overridePendingTransition(R.anim.backin, R.anim.backout);
}
});
button2 = (ImageButton)findViewById(R.id.imageButton2);
button2.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View Button1) {
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("message/rfc822");
i.putExtra(Intent.EXTRA_EMAIL , new String[]{"contact@mail.fr"});
i.putExtra(Intent.EXTRA_SUBJECT, "");
i.putExtra(Intent.EXTRA_TEXT , "");
try {
startActivity(Intent.createChooser(i, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(ShopActivity.this, "Pas de client de messagerie installé sur cet appareil.", Toast.LENGTH_SHORT).show();
}
}
});
button3 = (ImageButton)findViewById(R.id.imageButton3);
button3.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View Button1) {
Intent intent = new Intent(ShopActivity.this, PhilosophyActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
}
});
button4 = (ImageButton)findViewById(R.id.imageButton4);
button4.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View Button1) {
finish();//go back to the previous Activity
overridePendingTransition(R.anim.backin, R.anim.backout);
}
});
button5 = (ImageButton)findViewById(R.id.imageButton6);
button5.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View Button1) {
Intent intent = new Intent(ShopActivity.this, MapActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
}
});
catalogue = (ImageButton)findViewById(R.id.feuilletez);
catalogue.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View Button1) {
Intent bookleturl = new Intent(ShopActivity.this, PdfReader.class);
bookleturl.putExtra("bookleturl", thebooketurl);
startActivity(bookleturl);
Intent intent = new Intent(ShopActivity.this, PdfReader.class);
startActivity(intent);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
}
});
// Add fonts
// Typeface typeFace=Typeface.createFromAsset(getAssets(),"fonts/HelveticaNeueBold.ttf");
// View's items
TextView shopAddressTextView=(TextView) findViewById(R.id.shopAddress);
// shopAddressTextView.setTypeface(typeFace);
TextView shopNameTextView=(TextView) findViewById(R.id.shopName);
TextView shopPhoneTextView=(TextView) findViewById(R.id.shopPhone);
TextView shopFaxTextView=(TextView) findViewById(R.id.shopFax);
TextView shopHoursTextView=(TextView) findViewById(R.id.shopHours);
TextView shopHoursTextView2=(TextView) findViewById(R.id.shopHours2);
ImageView firstImage=(ImageView) findViewById(R.id.firstImage);
ImageView secondImage=(ImageView) findViewById(R.id.secondImage);
/*
// Reading text file from assets folder
StringBuffer sb = new StringBuffer();
BufferedReader br = null;
try {
br = new BufferedReader(new InputStreamReader(getAssets().open(
"test.json")));
String temp;
while ((temp = br.readLine()) != null)
sb.append(temp);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
br.close(); // stop reading
} catch (IOException e) {
e.printStackTrace();
}
}
String myjsonstring = sb.toString();
Log.d("string: " , myjsonstring);*/
JSONArray array = null;
try {
array = new JSONArray(jsonStr);
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
JSONObject jsonObject = array.getJSONObject(0);
String id = jsonObject.getString("id");
System.out.println("id --->" + id);
String url = jsonObject.getString("url");
System.out.println("url --->" + url);
String created_at = jsonObject.getString("created_at");
System.out.println("created_at --->" + created_at);
String updated_at = jsonObject.getString("updated_at");
System.out.println("updated_at --->" + updated_at);
String name = jsonObject.getString("name");
shopNameTextView.setText(jsonObject.getString("name"));
System.out.println("name --->" + name);
String phone = jsonObject.getString("phone");
if(phone == "null")
shopPhoneTextView.setText("-");
else
shopPhoneTextView.setText(jsonObject.getString("phone"));
System.out.println("phone --->" + phone);
String fax = jsonObject.getString("fax");
if(fax == "null")
shopFaxTextView.setText("-");
else
shopFaxTextView.setText(jsonObject.getString("fax"));
System.out.println("fax --->" + fax);
final String email = jsonObject.getString("email");
emailButton = (Button)findViewById(R.id.buttonEmail);
emailButton.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View Button4) {
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("message/rfc822");
if(email == "null")
i.putExtra(Intent.EXTRA_EMAIL , new String[]{"contact@mail.fr"});
else
i.putExtra(Intent.EXTRA_EMAIL , new String[]{email});
i.putExtra(Intent.EXTRA_SUBJECT, "");
i.putExtra(Intent.EXTRA_TEXT , "");
try {
startActivity(Intent.createChooser(i, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(ShopActivity.this, "Pas de client de messagerie installé sur cet appareil.", Toast.LENGTH_SHORT).show();
}
}
});
//shopEmailTextView.setText(jsonObject.getString("email"));
System.out.println("email --->" + phone);
String website_url = jsonObject.getString("website_url");
System.out.println("website_url --->" + phone);
String detail = jsonObject.getString("detail");
System.out.println("detail --->" + detail);
String logo_url = jsonObject.getString("logo_url");
System.out.println("logo_url --->" + logo_url);
String logo_thumbnail_url = jsonObject.getString("logo_thumbnail_url");
System.out.println("logo_thumbnail_url --->" + logo_thumbnail_url);
JSONArray photos_urls = jsonObject.getJSONArray("photos_urls");
System.out.println("photos_urls --->" + photos_urls);
image1 = photos_urls.getString(0);
if(image1 != null){
new DownloadImageTask((ImageView) findViewById(R.id.firstImage))
.execute(image1);
}
image2 = photos_urls.getString(0);
if(image2 != null){
new DownloadImageTask((ImageView) findViewById(R.id.secondImage))
.execute(image2);
}
JSONArray opening_hours = jsonObject.getJSONArray("opening_hours");
String hoursTitle = "Horaires d'ouverture :";
String lundi = opening_hours.getString(0);
if(lundi==null)
lundi = "NC";
String mardi = opening_hours.getString(1);
String mercredi = opening_hours.getString(2);
String jeudi = opening_hours.getString(3);
String vendredi = opening_hours.getString(4);
String samedi = opening_hours.getString(5);
shopHoursTextView.setText(hoursTitle+"\nLundi : "+lundi+"\nMardi : "+mardi+"\nMercredi : "+mercredi+"");
shopHoursTextView2.setText("Jeudi : "+jeudi+"\nVendredi : "+vendredi+"\nSamedi : "+samedi);
System.out.println("opening_hours --->" + opening_hours);
String address_string = jsonObject.getString("address_string");
shopAddressTextView.setText(jsonObject.getString("address_string"));
System.out.println("address_string --->" + address_string);
JSONObject contact = jsonObject.getJSONObject("contact");
String title = contact.getString("title");
System.out.println("title --->" + title);
String first_name = contact.getString("first_name");
System.out.println("first_name --->" + first_name);
String last_name = contact.getString("last_name");
System.out.println("last_name --->" + last_name);
JSONObject address = jsonObject.getJSONObject("address");
String id_address = address.getString("id");
System.out.println("id --->" + id_address);
String url_address = address.getString("url");
System.out.println("url --->" + url_address);
String created_at_address = address.getString("created_at");
System.out.println("created_at_address --->" + created_at_address);
String updated_at_address = address.getString("updated_at");
System.out.println("updated_at_address --->" + updated_at_address);
String street_address = address.getString("street_address");
System.out.println("street_address --->" + street_address);
String extended_address = address.getString("extended_address");
System.out.println("extended_address --->" + extended_address);
String postal_code = address.getString("postal_code");
System.out.println("postal_code --->" + postal_code);
String locality = address.getString("locality");
System.out.println("locality --->" + locality);
String country_code_alpha2 = address.getString("country_code_alpha2");
System.out.println("country_code_alpha2 --->" + country_code_alpha2);
JSONArray coordinates = address.getJSONArray("coordinates");
System.out.println("coordinates --->" + coordinates);
latitude = coordinates.getLong(0);
longitude = coordinates.getLong(1);
JSONObject booklet = jsonObject.getJSONObject("booklet");
String id_booklet = booklet.getString("id");
System.out.println("id_booklet --->" + id_booklet);
String url_booklet = booklet.getString("url");
System.out.println("url_booklet --->" + url_booklet);
String created_at_booklet = booklet.getString("created_at");
System.out.println("created_at_booklet --->" + created_at_booklet);
String updated_at_booklet = booklet.getString("updated_at");
System.out.println("updated_at_booklet --->" + updated_at_booklet);
String title_booklet = booklet.getString("title");
System.out.println("title_booklet --->" + title_booklet);
String thumbnail_url = booklet.getString("thumbnail_url");
System.out.println("thumbnail_url --->" + thumbnail_url);
String document_url = booklet.getString("document_url");
System.out.println("document_url --->" + document_url);
String presented = booklet.getString("presented");
thebooketurl = presented;
System.out.println("presented --->" + presented);
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
return null;
}
}
@Override
public void onBackPressed() {
finish();//go back to the previous Activity
overridePendingTransition(R.anim.backin, R.anim.backout);
}
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImageTask(ImageView bmImage) {
this.bmImage = bmImage;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap myImage = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
myImage = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
myImage = Bitmap.createScaledBitmap(myImage, 300, 200, false);;
return myImage;
}
protected void onPostExecute(Bitmap result) {
bmImage.setImageBitmap(result);
}
}
}
答案 0 :(得分：0)
在第339行放置一个断点，看看有什么失败。错误的基本部分在这里：
Caused by: java.lang.NullPointerException
12-30 17:40:57.045: E/AndroidRuntime(26286): at com.begital.votrebijoutier.ShopActivity$GetJson.doInBackground(ShopActivity.java:339)
我的猜测是你的数组为空。
答案 1 :(得分：0)
错误日志基本上说明了两件事：
NullPointerException引起的
现在你在评论中发布了这一行：
JSONObject jsonObject = array.getJSONObject(0);
当发生空指针异常时，通常在您尝试在不存在的对象上调用函数时（为空）。在此特定代码行中，只有在array变量为空时才会发生。如果没有更多的代码可见性，我不能说更多。
答案 2 :(得分：0)
您不应该访问doInBackground中的任何UI元素，此方法在后台线程中运行。
那么doInBackground（）＆amp;中的网络操作也是如此。访问您的Buttons＆amp; TextView中的onPostExecute()或onProgressUpdate()中的publishProgress()来自doInBackground()。