在Android中动态添加表行

Question

我正在尝试创建一个布局,我需要动态添加表行.下面是表格布局xml

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/displayLinear"
    android:background="@color/background_df"
    android:orientation="vertical" >

         <TableRow
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/display_row"
            android:layout_marginTop="280dip" >

</TableLayout>

动态添加行的活动文件是

public void init(){
    menuDB = new MenuDBAdapter(this);
    ll = (TableLayout) findViewById(R.id.displayLinear);

    TableRow row=(TableRow)findViewById(R.id.display_row);
    for (int i = 0; i <2; i++) {

        checkBox = new CheckBox(this);
        tv = new TextView(this);
        addBtn = new ImageButton(this);
        addBtn.setImageResource(R.drawable.add);
        minusBtn = new ImageButton(this);
        minusBtn.setImageResource(R.drawable.minus);
        qty = new TextView(this);
        checkBox.setText("hello");
        qty.setText("10");
        row.addView(checkBox);
        row.addView(minusBtn);
        row.addView(qty);
        row.addView(addBtn);
        ll.addView(row,i);

    }
}

但是当我运行这个时,我的错误就在于此

08-13 16:27:46.437: E/AndroidRuntime(23568): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.roms/com.example.roms.DisplayActivity}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

我知道这是由于命令ll.addView(row,i);,但当我删除它时,它将所有东西添加到一行而不是为下一个项目创建一个新行.我尝试给索引,row.addView(addBtn,i)但仍然没有正确填充.请指教.谢谢.

Answer 1

创建一个init()函数并指向表格布局.然后创建所需的行和列.

   public void init() {
            TableLayout stk = (TableLayout) findViewById(R.id.table_main);
            TableRow tbrow0 = new TableRow(this);
            TextView tv0 = new TextView(this);
            tv0.setText(" Sl.No ");
            tv0.setTextColor(Color.WHITE);
            tbrow0.addView(tv0);
            TextView tv1 = new TextView(this);
            tv1.setText(" Product ");
            tv1.setTextColor(Color.WHITE);
            tbrow0.addView(tv1);
            TextView tv2 = new TextView(this);
            tv2.setText(" Unit Price ");
            tv2.setTextColor(Color.WHITE);
            tbrow0.addView(tv2);
            TextView tv3 = new TextView(this);
            tv3.setText(" Stock Remaining ");
            tv3.setTextColor(Color.WHITE);
            tbrow0.addView(tv3);
            stk.addView(tbrow0);
            for (int i = 0; i < 25; i++) {
                TableRow tbrow = new TableRow(this);
                TextView t1v = new TextView(this);
                t1v.setText("" + i);
                t1v.setTextColor(Color.WHITE);
                t1v.setGravity(Gravity.CENTER);
                tbrow.addView(t1v);
                TextView t2v = new TextView(this);
                t2v.setText("Product " + i);
                t2v.setTextColor(Color.WHITE);
                t2v.setGravity(Gravity.CENTER);
                tbrow.addView(t2v);
                TextView t3v = new TextView(this);
                t3v.setText("Rs." + i);
                t3v.setTextColor(Color.WHITE);
                t3v.setGravity(Gravity.CENTER);
                tbrow.addView(t3v);
                TextView t4v = new TextView(this);
                t4v.setText("" + i * 15 / 32 * 10);
                t4v.setTextColor(Color.WHITE);
                t4v.setGravity(Gravity.CENTER);
                tbrow.addView(t4v);
                stk.addView(tbrow);
            }

        }

在onCreate方法中调用init函数:

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);

        init();
    }

布局文件如:

 <ScrollView
        android:id="@+id/scrollView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#3d455b"
        android:layout_alignParentLeft="true" >

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

            <RelativeLayout
                android:id="@+id/RelativeLayout1"
                android:layout_width="fill_parent"
                android:layout_gravity="center"
                android:layout_height="fill_parent"
                android:orientation="vertical" >

                <TableLayout
                    android:id="@+id/table_main"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerHorizontal="true" >
                </TableLayout>
            </RelativeLayout>
        </HorizontalScrollView>
    </ScrollView>

看起来像:

Answer 2

您不应该使用布局XML中定义的项目来创建更多的实例.您应该在单独的XML中创建它并对其进行膨胀或者创建TableRow programmaticaly.如果以programmaticaly创建它们,应该是这样的:

    public void init(){
    TableLayout ll = (TableLayout) findViewById(R.id.displayLinear);


    for (int i = 0; i <2; i++) {

        TableRow row= new TableRow(this);
        TableRow.LayoutParams lp = new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT);
        row.setLayoutParams(lp);
        checkBox = new CheckBox(this);
        tv = new TextView(this);
        addBtn = new ImageButton(this);
        addBtn.setImageResource(R.drawable.add);
        minusBtn = new ImageButton(this);
        minusBtn.setImageResource(R.drawable.minus);
        qty = new TextView(this);
        checkBox.setText("hello");
        qty.setText("10");
        row.addView(checkBox);
        row.addView(minusBtn);
        row.addView(qty);
        row.addView(addBtn);
        ll.addView(row,i);
    }
}

Answer 3

正如Fredigato所说,你也可以在一个单独的布局文件中声明一个RelativeLayout.然后使用以下方法实例化它:

for(int i = 0; i < 6; i ++){
LayoutInflater inflater = (LayoutInflater)getApplicationContext().getSystemService
                (Context.LAYOUT_INFLATER_SERVICE);
RelativeLayout row = (RelativeLayout) inflater.inflate(R.layout.table_view,null);
        quizesTableLayout.addView(row,i);
}

在这种方法中,您可以使用XML轻松设计一个自定义行并重用它.

现在,能够在实例化的RelativeLayout中更改子视图.您可以调用row.childAt(index).

所以假设你在RelativeLayout中有一个TextView,你可以使用:

TextView tv = (TextView) row.childAt(0);
tv.setText("Text");