使用for循环设置TextView文本，以便显示多行

时间：2016-09-02 06:14:46

标签： java android textview tablelayout android-tablelayout

所以我有一个for循环，我希望每次在textview中输出一个新行。但是，我不确定这是否可行。我有TableLayout，但它把项目垂直而不是水平放置。我想到了ListView但不知道如何设置它的文本。

这是我的代码

<Window.Resources>
    <ControlTemplate x:Key="RbTemplateKey" TargetType="RadioButton">
        <ToggleButton IsChecked="{Binding IsChecked, Mode=TwoWay,RelativeSource={RelativeSource AncestorType=RadioButton, Mode=FindAncestor}}"/>
    </ControlTemplate>
</Window.Resources>

<Grid>
    <StackPanel Margin="141,148,161,0" Orientation="Horizontal" Background="AliceBlue">

        <RadioButton Width="25" Height="25" Margin="10" Template="{StaticResource RbTemplateKey}"/>
        <RadioButton Width="25" Height="25" Margin="10" Template="{StaticResource RbTemplateKey}"/>
        <RadioButton Width="25" Height="25" Margin="10" Template="{StaticResource RbTemplateKey}"/>
        <RadioButton Width="25" Height="25" Margin="10" Template="{StaticResource RbTemplateKey}"/>

    </StackPanel>
</Grid>

这是我的XML：

    import android.app.Fragment;
import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

import com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route;

import org.joda.time.DateTime;
import org.w3c.dom.Text;

import java.io.IOException;
import java.util.Map;

import okhttp3.Request;
import okhttp3.Response;


/**
 * Created by James Singleton on 8/13/2016.
 */

public class WeeklyDrives extends Fragment implements APIRequestsUtil.APIRequestResponseListener
{
    View myView;
    Map<String, Route> drives;
    private TextView driveNumber;
    private TextView driveDistance;
    private TextView driveTime;
    private TextView driveNumList;
    private TextView driveDistList;
    private TextView driveTimeList;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        myView = inflater.inflate(R.layout.weekly_drives, container, false);
        APIRequestsUtil.setOnNetWorkListener(this);

        return myView;
    }


    private void populateView() {
        this.getActivity().runOnUiThread(new Runnable() {
            @Override
            public void run() {
                drives = APIRequestsUtil.getRoutes();

                driveNumber = (TextView) myView.findViewById(R.id.Drive_Number);
                driveDistance = (TextView) myView.findViewById(R.id.Drive_Distance);
                driveTime = (TextView) myView.findViewById(R.id.Drive_Time);

                driveNumber.setText("Drive Num.");
                driveDistance.setText("Distance");
                driveTime.setText("Time");
                int driveNum = 0;
                for (Map.Entry drive : drives.entrySet()) {
                    TableRow tr = new TableRow(getActivity());
                    Route route = (Route) drive.getValue();
                    tr.setId(driveNum++);
                    //tr.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));

                    DateTime startTime = new DateTime(route.getStart_time());
                    DateTime endTime = new DateTime(route.getEnd_time());


                    driveNumList = (TextView) myView.findViewById(R.id.Drive_Number_List);
                    driveDistList = (TextView) myView.findViewById(R.id.Drive_Distance_List);
                    driveTimeList = (TextView) myView.findViewById(R.id.Drive_Time_List);

                    driveNumList.setText(driveNumList.getText().toString() + String.valueOf(driveNum) + System.getProperty("line.separator"));
                    driveDistList.setText(driveDistList.getText().toString() + Float.parseFloat(route.getLen()) / 1000 + " km" + System.getProperty("line.separator"));
                    driveTimeList.setText(driveTimeList.getText().toString() + ((endTime.getMillis() - startTime.getMillis())/ 1000)/60 + " min" + System.getProperty("line.separator"));
                }
            }
        });

    }

    @Override
    public void onFailure(Request request, Throwable throwable) {

    }

    @Override
    public void onResponse(Response response) {
        populateView();
    }
}

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <!--Header aligned to top --> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/header" android:gravity="center" android:background="#FC9"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/Drive_Number" android:layout_margin="4dp" android:textSize="20sp" android:textColor="#000"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/Drive_Distance" android:layout_toRightOf="@+id/Drive_Number" android:layout_margin="4dp" android:textSize="20sp" android:textColor="#000"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/Drive_Time" android:layout_toRightOf="@+id/Drive_Distance" android:layout_margin="4dp" android:textSize="20sp" android:textColor="#000"/> </RelativeLayout> <ScrollView android:layout_width="fill_parent" android:layout_height="fill_parent" android:scrollbars="vertical" android:background="#005" android:layout_below="@+id/header" android:id="@+id/scrollableContents"> <!--<TableLayout--> <!--android:id="@+id/fragment1_tlayout"--> <!--android:layout_width="wrap_content"--> <!--android:layout_height="wrap_content"--> <!--android:stretchColumns="0,1">--> <!--</TableLayout>--> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/Drive_Number_List" android:layout_margin="4dp" android:textSize="20sp" android:textColor="#CCCCCC" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/Drive_Distance_List" android:layout_toRightOf="@+id/Drive_Number_List" android:layout_margin="4dp" android:textSize="20sp" android:textColor="#CCCCCC"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/Drive_Time_List" android:layout_toRightOf="@+id/Drive_Distance_List" android:layout_margin="4dp" android:textSize="20sp" android:textColor="#CCCCCC"/> </LinearLayout> </ScrollView> </RelativeLayout> 输出

drive.entrySet()

3 个答案:

答案 0 :(得分：2)

将android:inputType="textMultiLine"添加到XML中的TextView。

将数据添加到TextView中：

driveNumList.setText(driveNumList.getText().toString() + String.valueOf(driveNum) + System.getProperty("line.separator"));

等等。

修改：您可以使用"\n"代替System.getProperty("line.separator")添加换行符。

答案 1 :(得分：1)

我建议为这种类型的东西使用ListView，以便它可以自动滚动，使用View循环来保持效率，清理代码并将其组织成可消化的段。

要使用ListView，首先需要将其添加到主XML文件中。这将成为以下内容：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!--Header aligned to top -->
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/header"
        android:gravity="center"
        android:background="#FC9">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/Drive_Number"
            android:layout_margin="4dp"
            android:textSize="20sp"
            android:textColor="#000"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/Drive_Distance"
            android:layout_toRightOf="@+id/Drive_Number"
            android:layout_margin="4dp"
            android:textSize="20sp"
            android:textColor="#000"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/Drive_Time"
            android:layout_toRightOf="@+id/Drive_Distance"
            android:layout_margin="4dp"
            android:textSize="20sp"
            android:textColor="#000"/>
    </RelativeLayout>
    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:scrollbars="vertical"
        android:background="#005"
        android:layout_below="@+id/header"
        android:id="@+id/scrollableContents">

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

    </RelativeLayout>
</RelativeLayout>

然后，您需要创建ListView适配器类。它处理每个个人列表项的数据（你的for循环中的东西）。

以下是您可能会使用的内容，但您可能需要进行自己的调整并导入更多自己的课程，将您的包名称添加到顶部等。

因此，创建一个名为DriveListAdapter.java的新Java类，并将以下代码放入其中：

import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.List;
import java.util.HashMap;
import java.util.Map;

public class DriveListAdapter extends ArrayAdapter<Map.Entry> {

    private final Activity context;
    // you may need to change List to something else (whatever is returned from drives.entrySet())
    private final List<Map.Entry> drives;

    // may also need to change List here (above comment)
    public DriveListAdapter(Activity context, List<Map.Entry> drives) {
        super(context, R.layout.drive_list_item, drives);
        this.context = context;
        this.drives = drives;
    }

    @Override
    public View getView(int position, View view, ViewGroup parent) {
        LayoutInflater inflater = context.getLayoutInflater();
        View rowView = inflater.inflate(R.layout.drive_list_item, null, true);

        Map.Entry drive = this.drives.get(position);

        // position is the index of the drives.entrySet() array
        int driveNum = position + 1;

        // need to import your Route class
        Route route = (Route) drive.getValue();

        // need to import your DateTime class
        DateTime startTime = new DateTime(route.getStart_time());
        DateTime endTime = new DateTime(route.getEnd_time());

        TextView driveNumList = (TextView) rowView.findViewById(R.id.Drive_Number_List);
        TextView driveDistList = (TextView) rowView.findViewById(R.id.Drive_Distance_List);
        TextView driveTimeList = (TextView) rowView.findViewById(R.id.Drive_Time_List);

        driveNumList.setText(String.valueOf(driveNum));
        driveDistList.setText(Double.parseDouble(route.getLen()) / 1000 + " km");
        driveTimeList.setText((endTime.getMillis() - startTime.getMillis())/ 1000 + " s");

        return rowView;
    }
}

然后，创建一个新的布局文件，该文件将是单个列表项的外观。将为列表中的每个驱动器呈现此布局。您可以调整此布局文件，以便正确对齐所有内容。我给出了一个如何做到这一点的例子（创建一个名为drive_list_item.xml的布局文件）：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="4dp"
        android:textSize="20sp"
        android:textColor="#CCCCCC"
        android:text="Medium Text"
        android:id="@+id/Drive_Number_List"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="4dp"
        android:textSize="20sp"
        android:textColor="#CCCCCC"
        android:text="Medium Text"
        android:id="@+id/Drive_Distance_List"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="4dp"
        android:textSize="20sp"
        android:textColor="#CCCCCC"
        android:text="Medium Text"
        android:id="@+id/Drive_Time_List"
        android:layout_alignParentTop="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />
</RelativeLayout>

最后，您只需要使用这个新的适配器类填充您在第一步中创建的ListView。

所以使用以下方法（填充ListView而不是使用for循环）：

private void populateView() {
    this.getActivity().runOnUiThread(new Runnable() {
        @Override
        public void run() {
            drives = APIRequestsUtil.getRoutes();

            driveNumber = (TextView) myView.findViewById(R.id.Drive_Number);
            driveDistance = (TextView) myView.findViewById(R.id.Drive_Distance);
            driveTime = (TextView) myView.findViewById(R.id.Drive_Time);

            driveNumber.setText("Drive Number");
            driveDistance.setText("Drive Distance");
            driveTime.setText("Drive Time");

            // edit: you need to generate your List data from the entrySet
            // the ArrayAdapter cannot take a Set argument - needs to be a List
            List<Map.Entry> list = new ArrayList<Map.Entry>();
            for (Map.Entry drive : drives.entrySet()) {
                list.add(drive);
            }

            // populate the ListView
            // may need to change "getActivity()" to something else
            // this constructor needs the "this" context of the activity 
            DriveListAdapter drivesListAdapter = new DriveListAdapter(getActivity(), list);
            ListView listView = (ListView)findViewById(R.id.listView);
            listView.setAdapter(drivesListAdapter);
        }
    });
}

答案 2 :(得分：0)

首先使用LinearLayout而不是TableLayoyt 

<LinearLayout
        android:id="@+id/llMainLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="vertical">

试试这段代码

LinearLayout llMain=(LinearLayout) myView.findViewById(R.id.llMainLayout);
for (Map.Entry drive : drives.entrySet()) {
            LinearLayout tr = new LinearLayout(getActivity());
                  tr.setOrientation(1); // horizontal
            Route route = (Route) drive.getValue();
            tr.setId(driveNum++);
            // set params 
            DateTime startTime = new DateTime(route.getStart_time());
            DateTime endTime = new DateTime(route.getEnd_time());

            TextView driveNumList = new TextView(); 
            TextView driveDistList = new TextView(); 
            TextView driveTimeList = new TextView(); 

            driveNumList.setText(String.valueOf(driveNum));
            driveDistList.setText(Double.parseDouble(route.getLen()) / 1000 + " km");
            driveTimeList.setText((endTime.getMillis() - startTime.getMillis())/ 1000 + " s");
            tr.addView(driveNumList);
            tr.addView(driveDistList);
            tr.addView(driveTimeList);

          llMain.addView(tr);
        }
    }
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