Question

我今天刚刚开始使用android studio，并按照一个工作教程制作用户登录页面。第一个活动显示，但是当我按下登录按钮时，应用程序崩溃时出现以下错误代码：

第一个

9505-9538 /？ E / AndroidRuntime：FATAL EXCEPTION：AsyncTask＃1 处理：com.example.aks.mobilepos，PID：9505 java.lang.RuntimeException：执行doInBackground（）时发生错误在android.os.AsyncTask $ 3.done（AsyncTask.java:300）在java.util.concurrent.FutureTask.finishCompletion（FutureTask.java:355） at java.util.concurrent.FutureTask.setException（FutureTask.java:222）在java.util.concurrent.FutureTask.run（FutureTask.java:242）在android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:231） at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1112） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:587）在java.lang.Thread.run（Thread.java:841）引发者：java.lang.IllegalStateException：目标主机不能为null，或者在参数中设置。 scheme = null，host = null，path = 192.168.1.141 / login.php at org.apache.http.impl.client.DefaultRequestDirector.determineRoute（DefaultRequestDirector.java:591）在org.apache.http.impl.client.DefaultRequestDirector.execute（DefaultRequestDirector.java:293）在org.apache.http.impl.client.AbstractHttpClient.execute（AbstractHttpClient.java:555）在org.apache.http.impl.client.AbstractHttpClient.execute（AbstractHttpClient.java:487）在org.apache.http.impl.client.AbstractHttpClient.execute（AbstractHttpClient.java:465）在com.example.aks.mobilepos.JSONParser.makeHttpRequest（JSONParser.java:110） at com.example.aks.mobilepos.LoginActivity $ AttemptLogin.doInBackground（LoginActivity.java:80） at com.example.aks.mobilepos.LoginActivity $ AttemptLogin.doInBackground（LoginActivity.java:53）在android.os.AsyncTask $ 2.call（AsyncTask.java:288）在java.util.concurrent.FutureTask.run（FutureTask.java:237）在android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:231） at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1112） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:587）在java.lang.Thread.run（Thread.java:841）

第二个：

9505-9505 /？ E / WindowManager：android.view.WindowLeaked：Activity com.example.aks.mobilepos.LoginActivity泄露了窗口com.android.internal.policy.impl.PhoneWindow $ DecorView {41c35f60 VE .... R ......最初添加的D 0,0-456,144} 在android.view.ViewRootImpl。（ViewRootImpl.java:346）在android.view.WindowManagerGlobal.addView（WindowManagerGlobal.java:248）在android.view.WindowManagerImpl.addView（WindowManagerImpl.java:69）在android.app.Dialog.show（Dialog.java:286） at com.example.aks.mobilepos.LoginActivity $ AttemptLogin.onPreExecute（LoginActivity.java:63）在android.os.AsyncTask.executeOnExecutor（AsyncTask.java:587）在android.os.AsyncTask.execute（AsyncTask.java:535）在com.example.aks.mobilepos.LoginActivity.onClick（LoginActivity.java:50）在android.view.View.performClick（View.java:4445）在android.view.View $ PerformClick.run（View.java:18446）在android.os.Handler.handleCallback（Handler.java:733）在android.os.Handler.dispatchMessage（Handler.java:95）在android.os.Looper.loop（Looper.java:136）在android.app.ActivityThread.main（ActivityThread.java:5146） at java.lang.reflect.Method.invokeNative（Native Method）在java.lang.reflect.Method.invoke（Method.java:515）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:732）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:566）在dalvik.system.NativeStart.main（本地方法）

我似乎无法弄清楚什么是错的，localhost / index.php可通过移动浏览器访问，它们位于同一个wifi网络上。

这是文件 LoginActivity：

public class LoginActivity extends ActionBarActivity implements View.OnClickListener{

Button bLogin;
EditText etUsername, etPassword;
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
private static final String LOGIN_URL = "192.168.1.141/login.php";
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    etUsername = (EditText) findViewById(R.id.etUsername);
    etPassword = (EditText) findViewById(R.id.etPassword);
    bLogin = (Button) findViewById(R.id.bLogin);
    bLogin.setOnClickListener(this);

}

@Override
public void onClick(View v) {
    new AttemptLogin().execute();
    }

 class AttemptLogin extends AsyncTask<String, String, String> {

    boolean failure = false;
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(LoginActivity.this);
        pDialog.setMessage("Attempting for login...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();
    }
     @Override
     protected String doInBackground(String... args) {
         // TODO Auto-generated method stub
         // here Check for success tag
         int success;
         String username = etUsername.getText().toString();
         String password = etPassword.getText().toString();
         try {

             List<NameValuePair> params = new ArrayList<NameValuePair>();
             params.add(new BasicNameValuePair("username", username));
             params.add(new BasicNameValuePair("password", password));

             Log.d("request!", "starting");

             JSONObject json = jsonParser.makeHttpRequest(
                     LOGIN_URL, "POST", params);

             // checking  log for json response
             Log.d("Login attempt", json.toString());

             // success tag for json
             success = json.getInt(TAG_SUCCESS);
             if (success == 1) {
                 Log.d("Successfully Login!", json.toString());

                 Intent ii = new Intent(LoginActivity.this,BillActivity.class);
                 finish();
                 // this finish() method is used to tell android os that we are done with current //activity now! Moving to other activity
                 startActivity(ii);
                 return json.getString(TAG_MESSAGE);
             }else{

                 return json.getString(TAG_MESSAGE);

             }
         } catch (JSONException e) {
             e.printStackTrace();
         }

         return null;
     }
     /**
      * Once the background process is done we need to  Dismiss the progress dialog asap
      * **/
     protected void onPostExecute(String message) {

         pDialog.dismiss();
         if (message != null){
             Toast.makeText(LoginActivity.this, message, Toast.LENGTH_LONG).show();
         }
     }
 }
}

JSONParser：

public class JSONParser {
static InputStream is = null;
static JSONObject jsonObj ;
static String json = "";

// default no argument constructor for jsonpaser class
public JSONParser() {

}


public JSONObject getJSONFromUrl(final String url) {

    // Making HTTP request
    try {

        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        // Executing POST request & storing the response from server  locally.
        HttpResponse httpResponse = httpClient.execute(httpPost);

        HttpEntity httpEntity = httpResponse.getEntity();

        is = httpEntity.getContent();

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {


        // Create a BufferedReader
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
        // Declaring string builder
        StringBuilder str = new StringBuilder();
        //  string to store the JSON object.
        String strLine = null;

        // Building while we have string !equal null.
        while ((strLine = reader.readLine()) != null) {
            str.append(strLine + "\n");
        }

        // Close inputstream.
        is.close();
        // string builder data conversion  to string.
        json = str.toString();
    } catch (Exception e) {
        Log.e("Error", " something wrong with converting result " + e.toString());
    }

    // Try block used for pasrseing String to a json object
    try {
        jsonObj = new JSONObject(json);
    } catch (JSONException e) {
        Log.e("json Parsering", "" + e.toString());
    }

    // Returning json Object.
    return jsonObj;

}



public JSONObject makeHttpRequest(String url, String method,
                                  List<NameValuePair> params) {

    // Make HTTP request
    try {

        // checking request method
        if(method == "POST"){

            // now defaultHttpClient object
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setEntity(new UrlEncodedFormEntity(params));

            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();

        }else if(method == "GET"){
            // request method is GET
            DefaultHttpClient httpClient = new DefaultHttpClient();
            String paramString = URLEncodedUtils.format(params, "utf-8");
            url += "?" + paramString;
            HttpGet httpGet = new HttpGet(url);

            HttpResponse httpResponse = httpClient.execute(httpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();
        }

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
        StringBuilder str = new StringBuilder();
        String strLine = null;
        while ((strLine = reader.readLine()) != null) {
            str.append(strLine + "\n");
        }
        is.close();
        json = str.toString();
    } catch (Exception e) {

    }

    // now will try to parse the string into JSON object
    try {
        jsonObj = new JSONObject(json);
    } catch (JSONException e) {

    }


    return jsonObj;

}

}

BillActivity是android studio生成的默认空白活动。

我也可以发布login.php文件，任何帮助都将不胜感激。

Answer 1

使用http：//或https：//启动您的网址。否则，它无法找出协议并将整个URL视为路径而不是主机后跟路径

致命异常：AsyncTask＃1和android.view.WindowLeaked

1 个答案: