Android 后参数给定误差_Android_Mysql_Android Intent_Android Activity

Android 后参数给定误差

android mysql

Android 后参数给定误差,android,mysql,android-intent,android-activity,Android,Mysql,Android Intent,Android Activity,嗨，我已经创建了一个应用程序，点击一个按钮，它会向下一个活动发送一个字符串，在第二个活动中，我使用该值从数据库检索数据 public class RecoProd extends Activity { EditText pd; TextView error; ArrayList<NameValuePair> postParameters; /** Called when the activity is first created. */ @O

嗨，我已经创建了一个应用程序，点击一个按钮，它会向下一个活动发送一个字符串，在第二个活动中，我使用该值从数据库检索数据

public class RecoProd extends Activity {
    EditText pd;
    TextView error;

    ArrayList<NameValuePair> postParameters;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {

        try {
            Class<?> strictModeClass = Class.forName("android.os.StrictMode", true, Thread.currentThread()
                    .getContextClassLoader());

            Class<?> threadPolicyClass = Class.forName("android.os.StrictMode$ThreadPolicy", true, Thread
                    .currentThread().getContextClassLoader());

            Class<?> threadPolicyBuilderClass = Class.forName("android.os.StrictMode$ThreadPolicy$Builder", true,
                    Thread.currentThread().getContextClassLoader());

            Method setThreadPolicyMethod = strictModeClass.getMethod("setThreadPolicy", threadPolicyClass);

            Method detectAllMethod = threadPolicyBuilderClass.getMethod("detectAll");
            Method penaltyMethod = threadPolicyBuilderClass.getMethod("penaltyLog");
            Method buildMethod = threadPolicyBuilderClass.getMethod("build");

            Constructor<?> threadPolicyBuilderConstructor = threadPolicyBuilderClass.getConstructor();
            Object threadPolicyBuilderObject = threadPolicyBuilderConstructor.newInstance();

            Object obj = detectAllMethod.invoke(threadPolicyBuilderObject);

            obj = penaltyMethod.invoke(obj);
            Object threadPolicyObject = buildMethod.invoke(obj);
            setThreadPolicyMethod.invoke(strictModeClass, threadPolicyObject);

        } catch (Exception ex) {
            String TAG = null;
            Log.w(TAG, ex);
        }
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recomain);
        Intent myIntent = getIntent(); // getting the value from the previous activity
        String lbl_name= myIntent.getStringExtra("lbl_name");//< get lbl_name from Intent
        pd = (EditText) findViewById(R.id.name);

        error = (TextView) findViewById(R.id.showresult);


                postParameters = new ArrayList<NameValuePair>();
                postParameters.add(new BasicNameValuePair("product", lbl_name
                        ));


                // String valid = "1";

                DownloadWebPageTask dw = new DownloadWebPageTask();
                dw.execute("");

    }

    private class DownloadWebPageTask extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... urls) {
            String response = null;
            for (String url : urls) {
                try {
                    response = CustomHttpClient.executeHttpPost("http://192.168.1.7/abc/check2.php", postParameters);  
                    String res = response.toString();
                    // res = res.trim();
                    res = res.replaceAll("\\s+", "");
                    // error.setText(res);
                    try{
                        res = "";
                  JSONArray jArray = new JSONArray(res);
                        for(int i=0;i<jArray.length();i++){
                                JSONObject json_data = jArray.getJSONObject(i);
                                Log.i("prod_id","id: "+json_data.getInt("prod_id")+
                                        ", prod_name: "+json_data.getString("prod_name")+
                                        ", prod_category: "+json_data.getString("prod_category")+
                                        ", prod_cost: "+json_data.getDouble("prod_cost")
                                );
                                //Get an output to the screen
                                res += "\n" + json_data.getInt("prod_id") + " -> "+ json_data.getString("prod_name");
                        }
                }
                catch(JSONException e){
                        Log.e("log_tag", "Error parsing data "+e.toString());
                }

                try{
                 error.setText(res);
                }
                catch(Exception e){
                 Log.e("log_tag","Error in Display!" + e.toString());;          
                }   
           }
                 catch (Exception e) {
            Log.e("log_tag","Error in http connection!!" + e.toString());     
           }
            }
            return response;

               }
        @Override
        protected void onPostExecute(String result) {
        }
    }
}

我正在做以下工作

    Intent myIntent = getIntent(); // getting the value from the previous activity
    myIntent.getStringExtra("lbl_name");
    postParameters = new ArrayList<NameValuePair>();
    postParameters.add(new BasicNameValuePair("product", lbl_name//passing the name to the database .getText().toString()));

访问数据库的代码

public class RecoProd extends Activity {
    EditText pd;
    TextView error;

    ArrayList<NameValuePair> postParameters;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {

        try {
            Class<?> strictModeClass = Class.forName("android.os.StrictMode", true, Thread.currentThread()
                    .getContextClassLoader());

            Class<?> threadPolicyClass = Class.forName("android.os.StrictMode$ThreadPolicy", true, Thread
                    .currentThread().getContextClassLoader());

            Class<?> threadPolicyBuilderClass = Class.forName("android.os.StrictMode$ThreadPolicy$Builder", true,
                    Thread.currentThread().getContextClassLoader());

            Method setThreadPolicyMethod = strictModeClass.getMethod("setThreadPolicy", threadPolicyClass);

            Method detectAllMethod = threadPolicyBuilderClass.getMethod("detectAll");
            Method penaltyMethod = threadPolicyBuilderClass.getMethod("penaltyLog");
            Method buildMethod = threadPolicyBuilderClass.getMethod("build");

            Constructor<?> threadPolicyBuilderConstructor = threadPolicyBuilderClass.getConstructor();
            Object threadPolicyBuilderObject = threadPolicyBuilderConstructor.newInstance();

            Object obj = detectAllMethod.invoke(threadPolicyBuilderObject);

            obj = penaltyMethod.invoke(obj);
            Object threadPolicyObject = buildMethod.invoke(obj);
            setThreadPolicyMethod.invoke(strictModeClass, threadPolicyObject);

        } catch (Exception ex) {
            String TAG = null;
            Log.w(TAG, ex);
        }
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recomain);
        Intent myIntent = getIntent(); // getting the value from the previous activity
        String lbl_name= myIntent.getStringExtra("lbl_name");//< get lbl_name from Intent
        pd = (EditText) findViewById(R.id.name);

        error = (TextView) findViewById(R.id.showresult);


                postParameters = new ArrayList<NameValuePair>();
                postParameters.add(new BasicNameValuePair("product", lbl_name
                        ));


                // String valid = "1";

                DownloadWebPageTask dw = new DownloadWebPageTask();
                dw.execute("");

    }

    private class DownloadWebPageTask extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... urls) {
            String response = null;
            for (String url : urls) {
                try {
                    response = CustomHttpClient.executeHttpPost("http://192.168.1.7/abc/check2.php", postParameters);  
                    String res = response.toString();
                    // res = res.trim();
                    res = res.replaceAll("\\s+", "");
                    // error.setText(res);
                    try{
                        res = "";
                  JSONArray jArray = new JSONArray(res);
                        for(int i=0;i<jArray.length();i++){
                                JSONObject json_data = jArray.getJSONObject(i);
                                Log.i("prod_id","id: "+json_data.getInt("prod_id")+
                                        ", prod_name: "+json_data.getString("prod_name")+
                                        ", prod_category: "+json_data.getString("prod_category")+
                                        ", prod_cost: "+json_data.getDouble("prod_cost")
                                );
                                //Get an output to the screen
                                res += "\n" + json_data.getInt("prod_id") + " -> "+ json_data.getString("prod_name");
                        }
                }
                catch(JSONException e){
                        Log.e("log_tag", "Error parsing data "+e.toString());
                }

                try{
                 error.setText(res);
                }
                catch(Exception e){
                 Log.e("log_tag","Error in Display!" + e.toString());;          
                }   
           }
                 catch (Exception e) {
            Log.e("log_tag","Error in http connection!!" + e.toString());     
           }
            }
            return response;

               }
        @Override
        protected void onPostExecute(String result) {
        }
    }
}

公共类RecoProd扩展活动{
编辑文本pd；
文本视图错误；
ArrayList后参数；
/**在首次创建活动时调用*/
@凌驾
创建时的公共void（Bundle savedInstanceState）{
试一试{
Class strictModeClass=Class.forName（“android.os.StrictMode”，true，Thread.currentThread（）
.getContextClassLoader（））；
Class threadPolicyClass=Class.forName（“android.os.StrictMode$ThreadPolicy”，true，线程
.currentThread（）.getContextClassLoader（））；
Class threadPolicyBuilderClass=Class.forName（“android.os.StrictMode$ThreadPolicy$Builder”，true，
Thread.currentThread（）.getContextClassLoader（））；
方法setThreadPolicyMethod=strictModeClass.getMethod（“setThreadPolicy”，threadPolicyClass）；
方法detectAllMethod=threadPolicyBuilderClass.getMethod（“detectAll”）；
方法penaltyMethod=threadPolicyBuilderClass.getMethod（“penaltyLog”）；
方法buildMethod=threadPolicyBuilderClass.getMethod（“构建”）；
构造函数threadPolicyBuilderConstructor=threadPolicyBuilderClass.getConstructor（）；
对象threadPolicyBuilderObject=threadPolicyBuilderConstructor.newInstance（）；
Object obj=detectAllMethod.invoke（threadPolicyBuilderObject）；
obj=惩罚方法调用（obj）；
Object threadPolicyObject=buildMethod.invoke（obj）；
调用（strictModeClass，threadPolicyObject）；
}捕获（例外情况除外）{
字符串标记=null；
Log.w（标签，ex）；
}
super.onCreate（savedInstanceState）；
setContentView（R.layout.recoain）；
Intent myIntent=getIntent（）；//从上一个活动获取值
String lbl_name=myIntent.getStringExtra（“lbl_name”）；//对于（int i=0；i您需要从Intent中提取lbl\u name
值，如下所示：
Intent myIntent = getIntent(); // getting the value from the previous activity
 String lbl_name= myIntent.getStringExtra("lbl_name");//< get lbl_name from Intent
 postParameters = new ArrayList<NameValuePair>();
 postParameters.add(new BasicNameValuePair("product",lbl_name));

尝试在Intent
中传递字符串值，如下所示：
使用getString（）；

Intent myIntent=getIntent（）；//从上一个活动获取值
String lbl_name=myIntent.getString（“lbl_name”）；
postParameters=新的ArrayList（）；
add（新的BasicNameValuePair（“product”，lbl_name//将名称传递给数据库。getText（）.toString（））；

显示将值放入Intent的代码。您好，有人知道上述问题的解决方案吗，即使我面临同样的问题…@user1844638:此代码从prev Activity获取lbl_名称，并将其作为值添加到BasicNameValuePair中product@user1844638：plz在代码中共享调用数据库的代码，并解释有关 issue@user1844638：我看到了，您得到了服务器的响应吗？让我们看看
postParameters.add(new BasicNameValuePair("product",
                              Your_prev_Activity_Name.lbl_name));

     Intent myIntent = new Intent(SinglePlaceActivity.this,RecoProd.class);
       myIntent.putExtra("lbl_name", "lbl_name");
       SinglePlaceActivity.this.startActivity(myIntent);

Intent myIntent = getIntent(); // getting the value from the previous activity
String lbl_name=myIntent.getString("lbl_name");
postParameters = new ArrayList<NameValuePair>();
postParameters.add(new BasicNameValuePair("product", lbl_name//passing the name to the database .getText().toString()));