更新类崩溃了，我无法打开它，而且我不了解 LogCat：
07-17 19:28:22.115: D/dalvikvm(3799): GC_FOR_ALLOC freed 133K, 23% free 12979K/16808K, paused 254ms, total 278ms
07-17 19:28:22.623: D/dalvikvm(3799): GC_FOR_ALLOC freed 15K, 15% free 14345K/16808K, paused 58ms, total 58ms
07-17 19:28:22.666: I/dalvikvm-heap(3799): Grow heap (frag case) to 16.517MB for 2514028-byte allocation
07-17 19:28:22.863: D/dalvikvm(3799): GC_FOR_ALLOC freed <1K, 13% free 16800K/19264K, paused 192ms, total 192ms
07-17 19:28:23.003: D/dalvikvm(3799): GC_CONCURRENT freed 0K, 13% free 16800K/19264K, paused 8ms+24ms, total 147ms
07-17 19:28:23.133: D/dalvikvm(3799): GC_FOR_ALLOC freed 1380K, 13% free 16801K/19264K, paused 57ms, total 58ms
07-17 19:28:23.173: I/dalvikvm-heap(3799): Grow heap (frag case) to 18.916MB for 2514028-byte allocation
07-17 19:28:23.443: D/dalvikvm(3799): GC_CONCURRENT freed <1K, 12% free 19256K/21720K, paused 109ms+10ms, total 269ms
07-17 19:28:28.693: D/AndroidRuntime(3799): Shutting down VM
07-17 19:28:28.703: W/dalvikvm(3799): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
07-17 19:28:28.786: E/AndroidRuntime(3799): FATAL EXCEPTION: main
07-17 19:28:28.786: E/AndroidRuntime(3799): android.os.NetworkOnMainThreadException
07-17 19:28:28.786: E/AndroidRuntime(3799): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
07-17 19:28:28.786: E/AndroidRuntime(3799): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
07-17 19:28:28.786: E/AndroidRuntime(3799): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
07-17 19:28:28.786: E/AndroidRuntime(3799): at java.net.InetAddress.getAllByName(InetAddress.java:214)
07-17 19:28:28.786: E/AndroidRuntime(3799): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
07-17 19:28:28.786: E/AndroidRuntime(3799): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
07-17 19:28:28.786: E/AndroidRuntime(3799): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
07-17 19:28:28.786: E/AndroidRuntime(3799): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
07-17 19:28:28.786: E/AndroidRuntime(3799): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
07-17 19:28:28.786: E/AndroidRuntime(3799): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
07-17 19:28:28.786: E/AndroidRuntime(3799): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
07-17 19:28:28.786: E/AndroidRuntime(3799): at com.example.ahliaevents.JSONParser.makeHttpRequest(JSONParser.java:62)
07-17 19:28:28.786: E/AndroidRuntime(3799): at com.example.ahliaevents.EditCard$GetCardDetails$1.run(EditCard.java:131)
07-17 19:28:28.786: E/AndroidRuntime(3799): at android.os.Handler.handleCallback(Handler.java:725)
07-17 19:28:28.786: E/AndroidRuntime(3799): at android.os.Handler.dispatchMessage(Handler.java:92)
07-17 19:28:28.786: E/AndroidRuntime(3799): at android.os.Looper.loop(Looper.java:137)
07-17 19:28:28.786: E/AndroidRuntime(3799): at android.app.ActivityThread.main(ActivityThread.java:5041)
07-17 19:28:28.786: E/AndroidRuntime(3799): at java.lang.reflect.Method.invokeNative(Native Method)
07-17 19:28:28.786: E/AndroidRuntime(3799): at java.lang.reflect.Method.invoke(Method.java:511)
07-17 19:28:28.786: E/AndroidRuntime(3799): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-17 19:28:28.786: E/AndroidRuntime(3799): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-17 19:28:28.786: E/AndroidRuntime(3799): at dalvik.system.NativeStart.main(Native Method)
07-17 19:28:33.943: I/Process(3799): Sending signal. PID: 3799 SIG: 9
我不明白 LogCat 中写了什么。以前有人遇到过同样的问题吗？
这是我的代码
public class EditCard extends Activity {
EditText txtName;
EditText txtPosition;
EditText txtCollege;
EditText txtPhone;
Button btnSave;
Button btnDelete;
String cid;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
// single product url
private static final String url_card_details = "http://XXX";
// url to update product
private static final String url_update_card = "http://XXX";
// url to delete product
private static final String url_delete_card = "http://XXX";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_CARDS = "cards";
private static final String TAG_CID = "cid";
private static final String TAG_CNAME = "name";
private static final String TAG_POSITION = "position";
private static final String TAG_COLLEGE = "college";
private static final String TAG_PHONE = "phone";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.edit_card);
// save button
btnSave = (Button) findViewById(R.id.SaveCard);
btnDelete = (Button) findViewById(R.id.DeleteCard);
// getting product details from intent
Intent i = getIntent();
// getting product id (pid) from intent
cid = i.getStringExtra(TAG_CID);
// Getting complete product details in background thread
new GetCardDetails().execute();
// save button click event
btnSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// starting background task to update product
new SaveCardDetails().execute();
}
});
// Delete button click event
btnDelete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// deleting product in background thread
new DeleteCard().execute();
}
});
}
/**
* Background Async Task to Get complete product details
* */
class GetCardDetails extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditCard.this);
pDialog.setMessage("Loading card details. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Getting product details in background thread
* */
protected String doInBackground(String... params) {
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
// Check for success tag
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("cid", cid));
// getting product details by making HTTP request
// Note that product details url will use GET request
JSONObject json = jsonParser.makeHttpRequest(
url_card_details, "GET", params);
// check your log for json response
Log.d("Single Product Details", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully received product details
JSONArray cardObj = json
.getJSONArray(TAG_CARDS); // JSON Array
// get first product object from JSON Array
JSONObject card = cardObj.getJSONObject(0);
// product with this pid found
// Edit Text
txtName = (EditText) findViewById(R.id.editCard1);
txtPosition = (EditText) findViewById(R.id.editCard2);
txtCollege= (EditText) findViewById(R.id.editCard3);
txtPhone= (EditText) findViewById(R.id.editCard4);
// display product data in EditText
txtName.setText(card.getString(TAG_CNAME));
txtPosition.setText(card.getString(TAG_POSITION));
txtCollege.setText(card.getString(TAG_COLLEGE));
txtPhone.setText(card.getString(TAG_PHONE));
}else{
// product with pid not found
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once got all details
pDialog.dismiss();
}
}
/**
* Background Async Task to Save product Details
* */
class SaveCardDetails extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditCard.this);
pDialog.setMessage("Saving Card ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Saving product
* */
protected String doInBackground(String... args) {
// getting updated data from EditTexts
String name = txtName.getText().toString();
String position = txtPosition.getText().toString();
String college = txtCollege.getText().toString();
String phone = txtPhone.getText().toString();
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("name", name));
params.add(new BasicNameValuePair("position", position));
params.add(new BasicNameValuePair("college", college));
params.add(new BasicNameValuePair("phone", phone));
// sending modified data through http request
// Notice that update product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(url_update_card,
"POST", params);
// check json success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully updated
Intent i = getIntent();
// send result code 100 to notify about product update
setResult(100, i);
finish();
} else {
// failed to update product
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product uupdated
pDialog.dismiss();
}
}
/*****************************************************************
* Background Async Task to Delete Product
* */
class DeleteCard extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditCard.this);
pDialog.setMessage("Deleting Product...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Deleting product
* */
protected String doInBackground(String... args) {
// Check for success tag
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("cid", cid));
// getting product details by making HTTP request
JSONObject json = jsonParser.makeHttpRequest(
url_delete_card, "POST", params);
// check your log for json response
Log.d("Delete Card", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// product successfully deleted
// notify previous activity by sending code 100
Intent i = getIntent();
// send result code 100 to notify about product deletion
setResult(100, i);
finish();
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product deleted
pDialog.dismiss();
}
}
}
这是代码检查一下我不知道它有什么问题