如何在activity Java代码中为TableRow项动态设置Layout_weight

Question

我希望将单元格与TableRow相匹配，就像我在XML中所做的那样。比如设定重量=1。在github上尝试了许多解决方案，但不知道为什么没有一个有效。我放置了表格的屏幕截图，希望你能得到我在这里修复的东西：带有静态标题行的TableRow

    <ScrollView
    android:layout_width="388dp"
    android:layout_height="353dp"
    android:layout_below="@+id/tbPaperPrice"
    android:layout_alignParentStart="true"
    android:layout_above="@+id/btnSave">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    <TableLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tblDataDisplay">

        <TableRow>
            <TextView
                android:text="ID"
                android:layout_width="wrap_content"
                android:layout_marginTop="5px"
                android:layout_marginBottom="5px"
                android:layout_weight="1"
                />
            <TextView
                android:text="Paper Type"
                android:layout_width="wrap_content"
                android:layout_marginTop="5px"
                android:layout_marginBottom="5px"
                android:layout_weight="1"
                />
            <TextView
                android:text="Gram"
                android:layout_width="wrap_content"
                android:layout_marginTop="5px"
                android:layout_marginBottom="5px"
                android:layout_weight="1"
                />
            <TextView
                android:text="Size"
                android:layout_width="wrap_content"
                android:layout_marginTop="5px"
                android:layout_marginBottom="5px"
                android:layout_weight="1"
                />
            <TextView
                android:text="Count"
                android:layout_width="wrap_content"
                android:layout_marginTop="5px"
                android:layout_marginBottom="5px"
                android:layout_weight="1"
                />
            <TextView
                android:text="Price"
                android:layout_width="wrap_content"
                android:layout_marginTop="5px"
                android:layout_marginBottom="5px"
                android:layout_weight="1"
                />
        </TableRow>
        <TableRow android:id="@+id/dataRow"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

        </TableRow>
    </TableLayout>
    </LinearLayout>
</ScrollView>

我尝试设置LinearLayout.LayoutParams，尝试在xml中添加TableRow，并为此设置布局params，但都不起作用。我的主布局是相对的，我在其中定义了所有活动视图项。下面是我的java代码：

                do {
                TableRow row = new TableRow(this);
                row.setLayoutParams(new TableLayout.LayoutParams(TableLayout.LayoutParams.MATCH_PARENT,TableLayout.LayoutParams.WRAP_CONTENT));

                //ID column
                TextView lbID = new TextView(this);
                lbID.setText(data.getString(0));
                lbID.setTextColor(Color.BLACK);
                lbID.setGravity(Gravity.CENTER);
                row.addView(lbID);

                //Paper Type column
                TextView lbpType = new TextView(this);
                lbpType.setText(data.getString(1));
                lbpType.setTextColor(Color.BLACK);
                lbpType.setGravity(Gravity.CENTER);
                row.addView(lbpType);

                //Gram column
                TextView lbGram = new TextView(this);
                lbGram.setText(data.getString(data.getColumnIndex("p_gram")));
                lbGram.setTextColor(Color.BLACK);
                lbGram.setGravity(Gravity.CENTER);
                row.addView(lbGram);

                //Size column
                TextView lbSize = new TextView(this);
                lbSize.setText(data.getString(data.getColumnIndex("p_size")));
                lbSize.setTextColor(Color.BLACK);
                lbSize.setGravity(Gravity.CENTER);
                row.addView(lbSize);

                //Count column
                TextView lbCount = new TextView(this);
                lbCount.setText(data.getString(data.getColumnIndex("p_count")));
                lbCount.setTextColor(Color.BLACK);
                lbCount.setGravity(Gravity.CENTER);
                row.addView(lbCount);

                //Price column
                TextView lbPrice = new TextView(this);
                lbPrice.setText(data.getString(data.getColumnIndex("p_price")));
                lbPrice.setTextColor(Color.BLACK);
                lbPrice.setGravity(Gravity.CENTER);
                row.addView(lbPrice);
                tableDisplayData.addView(row);
            } while (data.moveToNext());

Answer 1

用下面给出的代码替换xml代码：

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

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

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5px"
        android:layout_marginBottom="5px"
        android:layout_weight="1"
        android:gravity="center"
        android:text="ID" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5px"
        android:layout_marginBottom="5px"
        android:layout_weight="1"
        android:gravity="center"
        android:text="Paper Type" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5px"
        android:layout_marginBottom="5px"
        android:layout_weight="1"
        android:gravity="center"
        android:text="Gram" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5px"
        android:layout_marginBottom="5px"
        android:layout_weight="1"
        android:gravity="center"
        android:text="Size" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5px"
        android:layout_marginBottom="5px"
        android:layout_weight="1"
        android:gravity="center"
        android:text="Count" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5px"
        android:layout_marginBottom="5px"
        android:layout_weight="1"
        android:gravity="center"
        android:text="Price" />
</LinearLayout>
<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />
</LinearLayout>

对于动态数据，您应该使用RecycerView来显示这些数据

首先创建模型类PaperModel.java，用于hold you papertype数据，如下所示：

public class PaperModel {

int id;
String paperType;
String gram;
String size;
String count;

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getPaperType() {
    return paperType;
}

public void setPaperType(String paperType) {
    this.paperType = paperType;
}

public String getGram() {
    return gram;
}

public void setGram(String gram) {
    this.gram = gram;
}

public String getSize() {
    return size;
}

public void setSize(String size) {
    this.size = size;
}

public String getCount() {
    return count;
}

public void setCount(String count) {
    this.count = count;
}

public String getPrice() {
    return price;
}

public void setPrice(String price) {
    this.price = price;
}

String price;
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5px"
        android:layout_marginBottom="5px"
        android:layout_weight="1"
        android:gravity="center"
        android:id="@+id/id" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5px"
        android:layout_marginBottom="5px"
        android:layout_weight="1"
        android:gravity="center"
        android:id="@+id/paper_type" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5px"
        android:layout_marginBottom="5px"
        android:layout_weight="1"
        android:gravity="center"
        android:id="@+id/gram" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5px"
        android:layout_marginBottom="5px"
        android:layout_weight="1"
        android:gravity="center"
        android:id="@+id/size" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5px"
        android:layout_marginBottom="5px"
        android:layout_weight="1"
        android:gravity="center"
        android:id="@+id/count" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5px"
        android:layout_marginBottom="5px"
        android:layout_weight="1"
        android:gravity="center"
        android:id="@+id/price" />

</LinearLayout>
</LinearLayout>

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;

public class paperAdapter extends RecyclerView.Adapter<paperAdapter.viewHolder> {
    private final ArrayList<PaperModel> paperModelArrayList;

    public paperAdapter(ArrayList<PaperModel> paperModelArrayList) {
        this.paperModelArrayList = paperModelArrayList;
    }

    @NonNull
    @Override
    public viewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.paper_type, parent, false);
        return new viewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull viewHolder holder, int position) {
        PaperModel currentItem = paperModelArrayList.get(position);
        holder.id.setText(String.valueOf(currentItem.id)); // because its in Int format
        holder.paperType.setText(currentItem.paperType);
        holder.gram.setText(currentItem.gram);
        holder.size.setText(currentItem.size);
        holder.count.setText(currentItem.count);
        holder.price.setText(currentItem.price);
    }

    @Override
    public int getItemCount() {
        return paperModelArrayList.size();
    }

    public static class viewHolder extends RecyclerView.ViewHolder {
        TextView id, paperType, gram, size, count, price;

        public viewHolder(@NonNull View itemView) {
            super(itemView);

            id = itemView.findViewById(R.id.id);
            paperType = itemView.findViewById(R.id.paper_type);
            gram = itemView.findViewById(R.id.gram);
            size = itemView.findViewById(R.id.size);
            count = itemView.findViewById(R.id.count);
            price = itemView.findViewById(R.id.price);
        }
    }

}

 private final ArrayList<PaperModel> paperModelArrayList;

do{
    PaperModel currentItem = new PaperModel(data.getString(0),
            data.getString(1),
            data.getString(data.getColumnIndex("p_gram")),
            data.getString(data.getColumnIndex("p_size")),
            data.getString(data.getColumnIndex("p_count")),
            data.getString(data.getColumnIndex("p_price")));
    paperModelArrayList.add(currentItem);
}while(data.moveToNext());

 RecyclerView recyclerView = findViewById(R.id.recyclerview);
    recyclerView.setHasFixedSize(true);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    paperAdapter paperAdapter = new paperAdapter(paperModelArrayList);
    recyclerView.setAdapter(paperAdapter);
    paperAdapter.notifyDataSetChanged();