Question

我被困在这里，我想在Android中使用Textview打印价值。但我只是最后一行。这里的响应是我正在解析的JSON编码数组名称，所有声明的字符串都是获取数据的属性，使用Linear Layout在4 textview中打印。我正在使用PHP从数据库中获取数据。

  TextView textView1 = (TextView)findViewById(R.id.ID);
  TextView textView2 = (TextView)findViewById(R.id.Name);
  TextView textView3 = (TextView)findViewById(R.id.Department);
  TextView textView4 = (TextView)findViewById(R.id.Semester);

  jsonArray = jsonObject.getJSONArray("response");
        String ID, Name, Department, Semester;
        int i = 0;
        while (i < jsonArray.length()) {
            JSONObject jsonObject1 = jsonArray.getJSONObject(i);
            ID = jsonObject1.getString("ID");
            textView1.setText(ID);
            Name = jsonObject1.getString("Name");
            textView2.setText(Name);
            Department = jsonObject1.getString("Department");
            textView3.setText(Department);
            Semester = jsonObject1.getString("Semester");
            textView4.setText(Semester);
            i++;
        }

我有五行（元组）数据，我想在新行中打印每一行。因此，在所有五行中应该有4个属性值。有没有办法在不存储数据的情况下这样做。

编辑：我必须为所有5个元组（行）打印4个属性。意味着我需要总共（4 X 5 =）20 textview。

Answer 1

问题在于，每次迭代都会覆盖textviews的内容。

您应该尝试将其附加到当前文本中，例如：

textview.setText(textview.getText() + "some string")

Answer 2

你试过PDO fetchAll方法吗？该方法主要根据数组格式的查询从数据库中获取所有行。

Answer 3

如果我理解正确，您希望有4x5 = 20个textviews。

如果您同意，则必须使用listview或recyclerview来实现此目的。

Here is an example of how to use Listview

Answer 4

这里的问题是你在文本视图上循环你的jsonArray。在每次迭代中，textView都会获得一个值，并且在每次新迭代中，textView的先前值都会被新的jsonArray值更改为下一个第i个索引。您可以创建textViews列表或创建回收站视图，以便插入和打印每个新的jsonArray值。

Refer to this link to learn about ListViews

Answer 5

此处只有4个TextView，但您想要打印5个人。如果您希望将它们以格式：

附加到这4个textView中

ID：1 2 3 ...

姓名：John Mike Person3 ......

部门：数学CS工程..

学期：1 2 3 ..

你这样做：

jsonArray = jsonObject.getJSONArray("response");
String ID, Name, Department, Semester;
int i = 0;
while (i < jsonArray.length()) {
     JSONObject jsonObject1 = jsonArray.getJSONObject(i);
     ID = jsonObject1.getString("ID");
     textView1.setText(textView1.getText().toString() + " "+ ID);
     Name = jsonObject1.getString("Name");
     textView2.setText(textView2.getText().toString() + " "+ Name);
     Department = jsonObject1.getString("Department");
     textView3.setText(textView3.getText().toString() + " "+ Department);
     Semester = jsonObject1.getString("Semester");
     textView4.setText(textView4.getText().toString() + " "+ Semester);
     i++;
}

关键是获取现有文本：

 TextView textview1 = (TextView) findViewById(R.id.abbreviated);
 String newText = jsonObject1.getString("Your_Field")
 String oldText = textview1.getText().toString();
 textview1.setText(oldText+ " " +newText);

但如果您想要一个单独显示每个人的列表，我建议您使用 RecyclerView ：

在res / layout中创建一个名为list_item.xml的文件：

＆＃13;

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    >
    
    <TextView
        android:id="@+id/id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/department"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/semester"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    </android.support.v7.widget.CardView>
</LinearLayout>

＆＃13;

在包中创建适配器作为MyAdapter.java：

公共类MyAdapter扩展了RecyclerView.Adapter { 私人Arraylist人;

// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public static class ViewHolder extends RecyclerView.ViewHolder {
    // each data item is just a string in this case
    public TextView tv_id;
    public TextView tv_name;
    public TextView tv_department;
    public TextView tv_semester;

    public ViewHolder(View view) {
        super(v);
        textView1 = (TextView) itemView.findViewById(R.id.id);
        textView2 = (TextView) itemView.findViewById(R.id.name);
        textView3 = (TextView) itemView.findViewById(R.id.department);
        textView4 = (TextView) itemView.findViewById(R.id.semester);
    }
}

// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(Arraylist myPeople) {
    people = myPeople;
}

// Create new views (invoked by the layout manager)
@Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
    View itemView = LayoutInflater.from(parent.getContext())
        .inflate(R.layout.list_item, parent, false);

    return new MyViewHolder(itemView);
}

// Replace the contents of a view (invoked by the layout manager)
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
     Person person = people.get(position);
     holder.id.setText(person.getID());
     holder.name.setText(person.getName());
     holder.department.setText(movie.getDepartment());
     holder.semester.setText(movie.getSemester());

}

// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount() {
    return people.length;
}

}

在MainActivity.java中设置recycleler视图

mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);

// use this setting to improve performance if you know that changes
// in content do not change the layout size of the RecyclerView
mRecyclerView.setHasFixedSize(true);

// use a linear layout manager
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);

Arraylist<Person> people = new Arraylist<>();

//Store your json object into this arraylist of persons
//Create a Person Object

// specify an adapter (see also next example)
mAdapter = new MyAdapter(myDataset);
mRecyclerView.setAdapter(mAdapter);

将此细分添加到activity_main.xml布局

＆＃13;

<android.support.v7.widget.RecyclerView
    android:id="@+id/my_recycler_view"
    android:scrollbars="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

＆＃13;

玩得开心！

Answer 6

感谢你这么慷慨。我搜索了这个问题，并找到了一个使用TableLayout的解决方案，它对我来说看起来更好，更容易。这是我用过的代码。

我的XML代码是：

<HorizontalScrollView
    android:id="@+id/hscrll1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TableLayout
            android:id="@+id/table"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_below="@+id/textView">
        </TableLayout>

    </RelativeLayout>

</HorizontalScrollView>

我的JAVA代码是我创建TableRow的地方，Textview填充了它的数据并添加了它。

TableLayout tableLayout = (TableLayout)findViewById(R.id.table);
jsonArray = jsonObject.getJSONArray("response");
String ID, Name, Department, Semester;
int i = 0;
while (i < jsonArray.length()) {
            JSONObject jsonObject1 = jsonArray.getJSONObject(i);
            ID = jsonObject1.getString("ID");
            Name = jsonObject1.getString("Name");
            Department = jsonObject1.getString("Department");
            Semester = jsonObject1.getString("Semester");
            i++;

            TableRow tableRow1 = new TableRow(this);
            TextView tv1 = new TextView(this);
            tv1.setText(ID);
            tv1.setTextColor(Color.RED);
            tv1.setGravity(Gravity.CENTER);
            tv1.setTextSize(20.0f);
            tableRow1.addView(tv1);

            TextView tv2 = new TextView(this);
            tv2.setText(Name);
            tv2.setTextColor(Color.WHITE);
            tv2.setGravity(Gravity.CENTER);
            tv2.setTextSize(20.0f);
            tableRow1.addView(tv2);

            TextView tv3 = new TextView(this);
            tv3.setText(Department);
            tv3.setTextColor(Color.WHITE);
            tv3.setGravity(Gravity.CENTER);
            tv3.setTextSize(20.0f);
            tableRow1.addView(tv3);

            TextView tv4 = new TextView(this);
            tv4.setText(Semester);
            tv4.setTextColor(Color.WHITE);
            tv4.setGravity(Gravity.CENTER);
            tv4.setTextSize(20.0f);
            tableRow1.addView(tv4);
            tableLayout.addView(tableRow1);
}

如何在Android Textview上循环打印获取的JSON数据

6 个答案: