使用 for 循环设置 TextView 文本，以便显示多行

Question

所以我有一个 for 循环，我想在它每次通过时在 textview 中输出一个新行。但是，我不确定这是否可能。我在那里有 TableLayout 但它垂直放置项目而不是水平放置。我想到了 ListView，但不确定如何设置它的文本。

这是我的代码

    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();
    }
}

这是我的 XML:

<?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>

drive.entrySet()输出

What is this:[2016-07-11--08-52-18=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@12a862, 2016-07-11--09-37-46=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@50bbdf3, 2016-07-11--18-54-22=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@6d21ab0, 2016-07-12--09-15-59=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@fb72d29, 2016-07-12--09-29-29=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@776e8ae, 2016-07-12--09-33-03=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@d1a464f, 2016-07-12--09-38-56=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@5b631dc, 2016-07-12--09-41-08=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@dec72e5, 2016-07-12--09-42-39=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@acce1ba, 2016-07-12--09-44-33=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@5def86b, 2016-07-12--09-49-31=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@d628fc8, 2016-07-12--09-54-06=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@7765861, 2016-07-12--19-04-34=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@8575f86, 2016-07-12--19-39-20=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@3f2b047, 2016-07-12--19-40-27=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@df4e074, 2016-07-12--19-41-28=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@b5f199d, 2016-07-13--08-45-17=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@db9ee12, 2016-07-13--09-01-32=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@2a009e3, 2016-07-13--15-02-04=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@9b98fe0, 2016-07-14--08-46-22=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@518b299, 2016-07-14--19-22-46=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@d44d95e, 2016-07-14--19-34-02=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@d3f613f, 2016-07-14--20-16-47=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@957ca0c, 2016-07-15--08-36-28=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@b38df55, 2016-07-15--09-52-32=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@c012d6a, 2016-07-15--12-09-57=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@252d25b, 2016-07-15--12-15-07=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@6bd7af8, 2016-07-15--15-36-10=com.example.jamessingleton.chffrapi.com.examples.jamessingleton.chffrapi.data.Route@df51bd1,

Answer 1

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

并像这样将数据添加到 TextView 中：

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

以此类推

编辑： 您可以使用 "\n" 而不是 System.getProperty("line.separator") 来添加换行符。

Answer 2

我会为这种类型的东西推荐一个 ListView，这样它就可以自动滚动，使用 View 回收来保持效率，清理你的代码并将其组织成易于理解的段。

要使用 ListView，您首先需要将其添加到主 XML 文件中。所以这将变成以下内容：

<?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>

之后，您需要创建 ListView 适配器 class。它负责处理每个个人列表项的数据（for 循环中的内容）。

这是您可能会使用的一个，尽管您可能需要进行自己的调整并导入更多您自己的 classes，将您的包名称添加到顶部，等等

因此创建一个名为 DriveListAdapter.java 的新 Java class 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，这将是单个列表项的样子。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，以便所有内容都正确对齐。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，您只需使用这个新适配器 class.

填充您在第一步中创建的 ListView

所以使用下面的方法（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);
        }
    });
}

Answer 3

首先你使用 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">

试试这个代码

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);
        }
    }

使用 for 循环设置 TextView 文本，以便显示多行

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