Java Android Studio数组值到TextView

Java Android Studio数组值到TextView,java,android,xml,android-studio,connection,Java,Android,Xml,Android Studio,Connection,我已经按照Wintech的教程建立了到MS SQL数据库的连接,我的结果是在调试器中得到200,因此我知道它正在成功连接。我的问题是,我无法从查询中获得要在应用程序中显示的结果 activity_main.xml: <?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/re

我已经按照Wintech的教程建立了到MS SQL数据库的连接,我的结果是在调试器中得到200,因此我知道它正在成功连接。我的问题是,我无法从查询中获得要在应用程序中显示的结果

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.pmatthews.appointmentcreator.MainActivity">

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/bg"

    android:orientation="vertical">

    <ImageView
        android:id="@+id/imageView"

        android:layout_width="match_parent"
        android:layout_height="wrap_content"

        android:onClick="openWebpage"
        android:src="@drawable/logo" />

    <ScrollView

        android:id="@+id/scroll"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="15dp"
                android:orientation="horizontal">

                <TextView
                    android:layout_width="0dp"

                    android:layout_height="wrap_content"
                    android:layout_marginLeft="15dp"

                    android:layout_marginTop="5dp"
                    android:layout_weight="1"
                    android:text="Appointment Number:"
                    android:textColor="#000000" />


                <EditText
                    android:id="@+id/ApptNumView"

                    android:layout_width="0dp"
                    android:layout_height="wrap_content"

                    android:layout_marginRight="15dp"
                    android:layout_marginTop="5dp"
                    android:layout_weight="1" />

                <ImageButton
                    android:id="@+id/refreshButton"

                    android:layout_width="30dp"
                    android:layout_height="30dp"
                    android:background="@drawable/refresh"
                    android:onClick="testConnection" />
            </LinearLayout>

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="30dp"

                android:orientation="horizontal">

                <TextView
                    android:id="@+id/textView"

                    android:layout_width="0dp"

                    android:layout_height="wrap_content"
                    android:layout_marginLeft="15dp"

                    android:layout_marginTop="5dp"
                    android:layout_weight="1"
                    android:text="Material Owner Number:"
                    android:textColor="#000000" />

                <TextView
                    android:id="@+id/MatOwnNumView"

                    android:layout_width="0dp"
                    android:layout_height="wrap_content"

                    android:layout_marginRight="15dp"
                    android:layout_marginTop="5dp"
                    android:layout_weight="1" />
            </LinearLayout>

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="30dp"

                android:orientation="horizontal">

                <TextView
                    android:layout_width="0dp"

                    android:layout_height="wrap_content"
                    android:layout_marginLeft="15dp"

                    android:layout_marginTop="5dp"
                    android:layout_weight="6.5"
                    android:text="Carrier Number:"
                    android:textColor="#000000" />

                <TextView
                    android:id="@+id/CarrNumView"

                    android:layout_width="0dp"
                    android:layout_height="wrap_content"

                    android:layout_marginRight="15dp"
                    android:layout_marginTop="5dp"
                    android:layout_weight="4" />

                <ImageButton
                    android:id="@+id/CarrNumButton"

                    android:layout_width="30dp"

                    android:layout_height="30dp"
                    android:background="@drawable/searchicon"


                    />
            </LinearLayout>

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="82dp"
                android:orientation="horizontal">

                <TextView
                    android:layout_width="0dp"

                    android:layout_height="wrap_content"
                    android:layout_marginLeft="15dp"


                    android:layout_marginTop="5dp"
                    android:layout_weight="1"
                    android:text="Purchase Order Number:"
                    android:textColor="#000000" />

                <EditText
                    android:id="@+id/PONInput"

                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_marginRight="15dp"
                    android:layout_marginTop="5dp"
                    android:layout_weight="1" />
            </LinearLayout>

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="82dp"
                android:orientation="horizontal">

                <TextView
                    android:layout_width="0dp"

                    android:layout_height="wrap_content"
                    android:layout_marginLeft="15dp"


                    android:layout_marginTop="5dp"
                    android:layout_weight="1"
                    android:text="Release Number:"
                    android:textColor="#000000" />

                <EditText
                    android:id="@+id/RelNumInput"

                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_marginRight="15dp"
                    android:layout_marginTop="5dp"
                    android:layout_weight="1" />
            </LinearLayout>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <TextView
                    android:layout_width="0dp"


                    android:layout_height="wrap_content"
                    android:layout_marginLeft="15dp"
                    android:layout_marginTop="5dp"

                    android:layout_weight="1"
                    android:text="Rail Car No:"
                    android:textColor="#000000" />

                <EditText
                    android:id="@+id/RailCarInput"

                    android:layout_width="0dp"
                    android:layout_height="wrap_content"

                    android:layout_marginRight="15dp"

                    android:layout_marginTop="5dp"
                    android:layout_weight="1" />
            </LinearLayout>


            <TextView
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"

                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"

                android:text="Actuals"

                android:textColor="#000000"
                android:textSize="30sp" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <CheckBox
                    android:id="@+id/truckArrivedBox"

                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="15dp"

                    android:layout_weight="1" />

                <TextView
                    android:layout_width="0dp"

                    android:layout_height="wrap_content"
                    android:layout_weight="7"

                    android:text="Truck has Arrived"

                    android:textColor="#000000" />
            </LinearLayout>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal">

                    <TextView
                        android:layout_width="0dp"

                        android:layout_height="wrap_content"

                        android:layout_marginLeft="15dp"
                        android:layout_marginTop="20dp"

                        android:layout_weight="1"
                        android:text="Bill Lading No In:"

                        android:textColor="#000000" />

                    <EditText
                        android:id="@+id/billNumInput"

                        android:layout_width="0dp"
                        android:layout_height="wrap_content"

                        android:layout_marginRight="15dp"
                        android:layout_marginTop="20dp"
                        android:layout_weight="1" />
                </LinearLayout>

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <TextView
                        android:layout_width="wrap_content"

                        android:layout_height="wrap_content"

                        android:layout_marginLeft="15dp"
                        android:layout_marginTop="40dp"

                        android:layout_weight="1"
                        android:text="Arrival Date:"
                        android:textColor="#000000" />

                    <DatePicker
                        android:id="@+id/arrivalDateInput"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"

                        android:layout_marginTop="20dp"
                        android:datePickerMode="calendar"


                        />

                </LinearLayout>

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <TextView
                        android:layout_width="fill_parent"

                        android:layout_height="wrap_content"

                        android:layout_marginLeft="15dp"
                        android:layout_marginTop="20dp"

                        android:layout_weight="1"

                        android:text="Arrival Time:"
                        android:textColor="#000000" />

                    <TimePicker
                        android:id="@+id/arrivalTimeInput"

                        android:layout_width="fill_parent"

                        android:layout_height="wrap_content"
                        android:layout_marginRight="15dp"

                        android:layout_marginTop="20dp"
                        android:layout_weight="1"
                        android:timePickerMode="spinner" />


                </LinearLayout>
            </LinearLayout>

            <LinearLayout

                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">

                <Button
                    android:id="@+id/recieveButton"

                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="15dp"
                    android:layout_marginRight="15dp"
                    android:text="Recieve Inventory" />

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal">

                    <Button
                        android:id="@+id/saveButton"

                        android:layout_width="0dp"

                        android:layout_height="wrap_content"
                        android:layout_marginLeft="15dp"

                        android:layout_weight="1"
                        android:text="Save"

                        />

                    <Button
                        android:id="@+id/cancelButton"

                        android:layout_width="0dp"
                        android:layout_height="wrap_content"
                        android:layout_marginRight="15dp"

                        android:layout_weight="1"
                        android:text="Cancel" />
                </LinearLayout>

            </LinearLayout>

            <ListView
                android:id="@+id/list"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"></ListView>

            <ListView
                android:id="@+id/listView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

            </ListView>




            <TextView
                android:id="@+id/txtConNum"
                android:layout_width="fill_parent"
                android:layout_height="100dp"/>





        </LinearLayout>

    </ScrollView>

</LinearLayout>


</android.support.constraint.ConstraintLayout>

Android-SQL Server数据库连接(第2部分,获取和发布数据)


您正在替换最后一个读取行输出,因此最后一行可能是\n个字符。 你应该替换

while ((line = reader.readLine()) != null){
                status = line;
            }

编辑

protected String doInBackground(String... connUrl){
    HttpURLConnection conn = null;
    BufferedReader reader;
    StringBuilder sb;

    try{
        final URL url = new URL(connUrl[0]);
        conn = (HttpURLConnection) url.openConnection();
        conn.addRequestProperty("Content-Type", "application/json; 
charset=utf-8");
        conn.setRequestMethod("GET");
        int result = conn.getResponseCode();
        if(result == 200){

            InputStream in = new BufferedInputStream(conn.getInputStream());
            reader = new BufferedReader(new InputStreamReader(in));
            sb = new StringBuilder();
            String line = null;

            while ((line = reader.readLine()) != null){
                sb.append(line);
            }

        }

    }catch(Exception ex){

    }
    return sb.toString();
    }
    protected void onPostExecute(String result){
       super.onPostExecute(result);
       System.out.println(result);
    }

我仔细地运行了调试器,发现它正在将查询中的数据存储到
result
。我在ListView中添加了一个TextView,在
AsyncTask
中声明为
txtV
,在
PostExecute
中添加了
txtV.setText(结果)

。。。。。。字符串行=null;while((line=reader.readLine())!=null){sb.append(line);}返回sb.toString();}catch(异常ex){}返回状态。。。。。。仍然没有显示任何结果。。我做错了吗?你能在BufferedReader阅读器正下方的“onPostExecute”中打印结果字符串吗;所以它可以解决我仍然无法解决符号sb。。我肯定是因为我太笨了,对不起
while ((line = reader.readLine()) != null){
                sb.append(line);
            }

..
return sb.toString()
protected String doInBackground(String... connUrl){
    HttpURLConnection conn = null;
    BufferedReader reader;
    StringBuilder sb;

    try{
        final URL url = new URL(connUrl[0]);
        conn = (HttpURLConnection) url.openConnection();
        conn.addRequestProperty("Content-Type", "application/json; 
charset=utf-8");
        conn.setRequestMethod("GET");
        int result = conn.getResponseCode();
        if(result == 200){

            InputStream in = new BufferedInputStream(conn.getInputStream());
            reader = new BufferedReader(new InputStreamReader(in));
            sb = new StringBuilder();
            String line = null;

            while ((line = reader.readLine()) != null){
                sb.append(line);
            }

        }

    }catch(Exception ex){

    }
    return sb.toString();
    }
    protected void onPostExecute(String result){
       super.onPostExecute(result);
       System.out.println(result);
    }