java - 当我向服务器提交用户输入时执行 doInBackground() 时发生错误

Question

我是初学者。我目前正在创建一个在用户和我的服务器之间建立连接的应用程序。例如，用户输入一些信息并单击按钮，然后所有信息将保存在我的服务器数据库表中。然而，在输入信息并单击按钮后，应用程序崩溃了。 logcat和java类如下:

日志猫

06-11 17:15:41.825  12946-12990/com.example.abc.androidhive W/dalvikvm﹕ threadid=10: thread exiting with uncaught exception (group=0xa62bb288)
06-11 17:15:41.825  12946-12990/com.example.abc.androidhive E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
java.lang.RuntimeException: An error occured while executing doInBackground()
 at android.os.AsyncTask$3.done(AsyncTask.java:299)
        at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
        at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
        at java.util.concurrent.FutureTask.run(FutureTask.java:137)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
.
.
.
.
.
.
06-11 17:20:48.157  15150-15150/com.example.chongcng2.androidhive E/WindowManager﹕ Activity com.example.chongcng2.androidhive.NewJobActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@535a6b7c that was originally added here
android.view.WindowLeaked: Activity com.example.chongcng2.androidhive.NewJobActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@535a6b7c that was originally added here

新工作 Activity

public class NewJobActivity extends Activity {

// Progress Dialog
private ProgressDialog pDialog;

JSONParser jsonParser = new JSONParser();
EditText inputName;
EditText inputPrice;
EditText inputDesc;
EditText inputResponsibility;
EditText inputCompany;
EditText inputContact;

// url to create new product
private static String url_create_product = "http:/175.159.211.84/android_connect_server/create_job.php";

// JSON Node names
private static final String TAG_SUCCESS = "success";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.server_add_job);

    // Edit Text
    inputName = (EditText) findViewById(R.id.inputName);
    inputPrice = (EditText) findViewById(R.id.inputPrice);
    inputDesc = (EditText) findViewById(R.id.inputDesc);
    inputResponsibility = (EditText) findViewById(R.id.inputResponsibility);
    inputCompany = (EditText) findViewById(R.id.inputCompany);
    inputContact = (EditText) findViewById(R.id.inputContact);

    // Create button
    Button btnCreateProduct = (Button) findViewById(R.id.btnCreateProduct);

    // button click event
    btnCreateProduct.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) {
            // creating new product in background thread
            new CreateNewProduct().execute();
        }
    });
}

/**
 * Background Async Task to Create new product
 * */
class CreateNewProduct extends AsyncTask<String, String, String> {

    /**
     * Before starting background thread Show Progress Dialog
     * */
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(NewJobActivity.this);
        pDialog.setMessage("Creating Job..");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();
    }

    /**
     * Creating product
     * */
    protected String doInBackground(String... args) {

        String post = inputName.getText().toString();
        String location = inputPrice.getText().toString();
        String salary = inputDesc.getText().toString();
        String responsibility = inputResponsibility.getText().toString();
        String company = inputCompany.getText().toString();
        String contact = inputContact.getText().toString();

        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("post", post));
        params.add(new BasicNameValuePair("location", location));
        params.add(new BasicNameValuePair("salary", salary));
        params.add(new BasicNameValuePair("responsibility", responsibility));
        params.add(new BasicNameValuePair("company", company));
        params.add(new BasicNameValuePair("contact", contact));

        // getting JSON Object
        // Note that create product url accepts POST method
        JSONObject json = jsonParser.makeHttpRequest(url_create_product,
                "POST", params);

        // check log cat fro response
        Log.d("Create Response", json.toString());

        // check for success tag
        try {
            int success = json.getInt(TAG_SUCCESS);

            if (success == 1) {
                // successfully created product
                Intent i = new Intent(getApplicationContext(), AllJobsActivity.class);
                startActivity(i);

                // closing this screen
                finish();
            } else {
                // failed to create 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 done
        pDialog.dismiss();
    }

}
}

有人可以帮忙吗？提前致谢 !

日志猫2

06-12 04:33:52.964  12196-12196/com.example.chongcng2.androidhive W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xa626c288)
06-12 04:33:52.964  12196-12196/com.example.chongcng2.androidhive E/AndroidRuntime﹕ FATAL EXCEPTION: main
android.os.NetworkOnMainThreadException
        at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
        at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
        at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
        at libcore.io.IoBridge.connect(IoBridge.java:112)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
        at java.net.Socket.connect(Socket.java:842)
        at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
        at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
        at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
        at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
        at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
        at com.example.chongcng2.androidhive.JSONParser.makeHttpRequest(JSONParser.java:51)
        at com.example.chongcng2.androidhive.NewJobActivity$CreateNewProduct.onPostExecute(NewJobActivity.java:121)
        at com.example.chongcng2.androidhive.NewJobActivity$CreateNewProduct.onPostExecute(NewJobActivity.java:74)
        at android.os.AsyncTask.finish(AsyncTask.java:631)
        at android.os.AsyncTask.access$600(AsyncTask.java:177)
        at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:4745)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
        at dalvik.system.NativeStart.main(Native Method)

NewJobActivity.java 2

public class NewJobActivity extends Activity {

// Progress Dialog
private ProgressDialog pDialog;

JSONParser jsonParser = new JSONParser();
EditText inputName;
EditText inputPrice;
EditText inputDesc;
EditText inputResponsibility;
EditText inputCompany;
EditText inputContact;
int success;
List<NameValuePair> params = new ArrayList<NameValuePair>();

// url to create new product
private static String url_create_product = "http://192.168.0.103/android_connect_server/create_job.php";

// JSON Node names
private static final String TAG_SUCCESS = "success";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.server_add_job);

    // Edit Text
    inputName = (EditText) findViewById(R.id.inputName);
    inputPrice = (EditText) findViewById(R.id.inputPrice);
    inputDesc = (EditText) findViewById(R.id.inputDesc);
    inputResponsibility = (EditText) findViewById(R.id.inputResponsibility);
    inputCompany = (EditText) findViewById(R.id.inputCompany);
    inputContact = (EditText) findViewById(R.id.inputContact);

    // Create button
    Button btnCreateProduct = (Button) findViewById(R.id.btnCreateProduct);

    // button click event
    btnCreateProduct.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) {
            // creating new product in background thread
            new CreateNewProduct().execute();
        }
    });
}

/**
 * Background Async Task to Create new product
 * */
class CreateNewProduct extends AsyncTask<String, String, String> {

    /**
     * Before starting background thread Show Progress Dialog
     * */
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(NewJobActivity.this);
        pDialog.setMessage("Creating Job..");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();
    }

    /**
     * Creating product
     * */
    protected String doInBackground(String... args) {

        String post = inputName.getText().toString();
        String location = inputPrice.getText().toString();
        String salary = inputDesc.getText().toString();
        String responsibility = inputResponsibility.getText().toString();
        String company = inputCompany.getText().toString();
        String contact = inputContact.getText().toString();

        // Building Parameters

        params.add(new BasicNameValuePair("post", post));
        params.add(new BasicNameValuePair("location", location));
        params.add(new BasicNameValuePair("salary", salary));
        params.add(new BasicNameValuePair("responsibility", responsibility));
        params.add(new BasicNameValuePair("company", company));
        params.add(new BasicNameValuePair("contact", contact));

        return null;
    }

    /**
     * After completing background task Dismiss the progress dialog
     * **/
    protected void onPostExecute(String file_url) {
        // dismiss the dialog once done
        pDialog.dismiss();

        try {
            JSONObject json = jsonParser.makeHttpRequest(url_create_product,
                    "POST", params);

            // check log cat fro response
            Log.d("Create Response", json.toString());
             success = json.getInt(TAG_SUCCESS);
            if (success == 1) {
                // successfully created product
                Intent i = new Intent(getApplicationContext(), AllJobsActivity.class);
                startActivity(i);

                finish();
            } else {
                // failed to create product
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

}
}

Answer 1

当您启动 AssyncTask 时，它将在屏幕上显示进度对话框

@Override
protected void onPreExecute() {
    super.onPreExecute();
    pDialog = new ProgressDialog(NewJobActivity.this);
    pDialog.setMessage("Creating Job..");
    pDialog.setIndeterminate(false);
    pDialog.setCancelable(true);
    pDialog.show();
}

如果您从 AssyncTask 内部启动一个新 Activity ，而之前没有“关闭”进度对话框，您的屏幕上将有一个新的 Activity 、新的上下文和新的 View ，但您的 AssyncTask 尚未最终确定，并且当它到达时

protected void onPostExecute(String file_url) {
    // dismiss the dialog once done
    pDialog.dismiss();
}

它将尝试关闭不再在您 View 中的窗口。

Activity com.example.chongcng2.androidhive.NewJobActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@535a6b7c that was originally added here
android.view.WindowLeaked: Activity com.example.chongcng2.androidhive.NewJobActivity has leaked window 

这是我解释它的最好方法 XD 我曾经在我的代码上看到这个错误，直到我意识到出了什么问题。希望对您有帮助。

编辑 1

 protected void onPostExecute(String file_url) {

     pDialog.dismiss();

     try {

         if (success == 1) {
             // successfully created product
             Intent i = new Intent(getApplicationContext(), AllJobsActivity.class);
             startActivity(i);

             // closing this screen
             finish();
         } else {
             // failed to create product
         }
     } catch (JSONException e) {
        e.printStackTrace();
     }

}

编辑2:
初始化

int success;

在声明 pDialog 和 TextView 时的任何方法之外，不要在“try”内直接初始化它

int success = json.getInt(TAG_SUCCESS);

我会问你或者将变量初始化为0，仅此而已