生成动态内容时出错

时间:2014-07-31 08:04:32

标签: java android dynamic

我尝试在用户点击按钮时从模板生成表单元素。我使用XML为新表单创建了模板和容器布局。它成功地生成了我告诉它生成的第一个表单,但是当我尝试生成除第一个表单之外的更多表单时,它给出了一个错误:"指定的子节点已经有父节点。你必须在孩子的第一个父母"上调用removeView()。关于我应该做什么以产生多个元素的任何线索?我已经尝试更改新创建的表单的ID,但是它给了我一个空指针异常并崩溃。谢谢。

public class MakeQuestion extends Activity implements OnClickListener{

    private static final int MY_BUTTON = 9000;
    int templateID = 1;
    Button b;
    Button target;
    View insertPoint;
    Button testTemplate;
    View v1;
    RelativeLayout.LayoutParams templateParams;
    LayoutInflater vi;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.make_question);
        Initialize();
    }

    public void Initialize(){
        //button for adding new forms
        b = (Button) findViewById(R.id.makeLayoutButton);
        b.setOnClickListener(this);

        //get the template form to be duplicated
        vi = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v1 = vi.inflate(R.layout.form_template, null);

        //set the params for the element that will have dynamically generated content below it
        templateParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

        //container where forms will be contained in
        insertPoint = findViewById(R.id.questionsContainer);

        //view where new form will go below
        View belowContainer = findViewById(R.id.questionTemplateFake);

        //set id for layout params of view
        belowContainer.setId(1);

        //set rule for new forms to go below view 'belowContainer'
        templateParams.addRule(RelativeLayout.BELOW, belowContainer.getId());

    }

    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.makeLayoutButton:
           v1 = vi.inflate(R.layout.form_template, null);

          //add view to the insertPoint
          ((LinearLayout) insertPoint).addView(v1);

            break;
        }
    }
}

添加的表格应该放入" questionsContainer"设置为低于" questionTemplateFake"

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:android1="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/grey_background" >

    <RelativeLayout
        android:id="@+id/relativeLayout1"
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:background="#8B459A"
        android:baselineAligned="false"
        android:clipToPadding="false" >

        <ImageView
            android:id="@+id/imageView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:src="@drawable/logo_small" />

        <ImageView
            android:id="@+id/imageView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:layout_marginRight="15dp"
            android:src="@drawable/settings" />

        <ImageView
            android:id="@+id/imageView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:layout_marginLeft="15dp"
            android:src="@drawable/search" />
    </RelativeLayout>

    <ScrollView
        android:id="@+id/scrollView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/relativeLayout1" >

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:gravity="center"
            android:orientation="vertical" >

            <RelativeLayout
                android:id="@+id/relative12"
                android:layout_width="270dp"
                android:layout_height="wrap_content"
                android:orientation="vertical" >

                <TextView
                    android:id="@+id/textView1"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="10dp"
                    android:text="WHAT IS YOUR QUESTION?" />

                <TextView
                    android:id="@+id/textView2"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignBaseline="@+id/save_button"
                    android:layout_alignBottom="@+id/save_button"
                    android:layout_alignRight="@+id/textView1"
                    android:text="ADD PICTURE OR VIDEO"
                    android:textSize="10sp" />

                <EditText
                    android:id="@+id/editText1"
                    android:layout_width="match_parent"
                    android:layout_height="25dp"
                    android:layout_alignParentLeft="true"
                    android:layout_below="@+id/textView1"
                    android:layout_marginTop="14dp"
                    android:background="@drawable/textlines"
                    android:ems="10"
                    android:hint="50 WORDS OR LESS"
                    android:inputType="textMultiLine"
                    android:paddingLeft="5dp" />

                <Button
                    android:id="@+id/save_button"
                    android:layout_width="75dp"
                    android:layout_height="20dp"
                    android:layout_alignParentRight="true"
                    android:layout_below="@+id/editText1"
                    android:layout_marginTop="16dp"
                    android:background="@drawable/purplebutton"
                    android:text="BROWSE"
                    android:textColor="@drawable/button_text_color"
                    android:textSize="10sp" />

                <TextView
                    android:id="@+id/TextView01"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentLeft="true"
                    android:layout_below="@+id/save_button"
                    android:layout_marginTop="25dp"
                    android:text="CREATE AN ANSWER" />



                <RelativeLayout
                    android:id="@+id/questionTemplateFake"
                    android:layout_width="wrap_content"
                    android:layout_height="60dp"
                    android:layout_alignParentLeft="true"
                    android:layout_below="@+id/TextView01" >

                    <Button
                        android:id="@+id/Button02eew"
                        android:layout_width="75dp"
                        android:layout_height="20dp"
                        android:layout_alignParentBottom="true"
                        android:layout_alignParentRight="true"
                        android:background="@drawable/purplebutton"
                        android:text="BROWSE"
                        android:textColor="@drawable/button_text_color"
                        android:textSize="10sp" />

                    <EditText
                        android:id="@+id/EditText02"
                        android:layout_width="match_parent"
                        android:layout_height="25dp"
                        android:layout_above="@+id/Button02"
                        android:layout_alignParentLeft="true"
                        android:background="@drawable/textlines"
                        android:ems="10"
                        android:hint="50 WORDS OR LESS"
                        android:inputType="textMultiLine"
                        android:paddingLeft="5dp" >

                        <requestFocus />
                    </EditText>

                    <TextView
                        android:id="@+id/TextView03"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentBottom="true"
                        android:layout_marginRight="19dp"
                        android:layout_toLeftOf="@+id/Button02"
                        android:text="ADD PICTURE OR VIDEO"
                        android:textSize="10sp" />

                </RelativeLayout>

                <LinearLayout
                    android:id="@+id/questionsContainer"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="80dp"
                    android:layout_marginTop="20dp"
                    android:orientation="vertical"
                    android:layout_below="@+id/questionTemplateFake"
                     >
                </LinearLayout>

            </RelativeLayout>

        </LinearLayout>
    </ScrollView>

    <Button
        android:id="@+id/makeLayoutButton"
        android:layout_width="100dp"
        android:layout_height="20dp"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/scrollView1"
        android:layout_marginRight="17dp"
        android:layout_marginTop="79dp"
        android:background="@drawable/purplebutton"
        android:text="MORE OPTIONS"
        android:textColor="@drawable/button_text_color"
        android:textSize="10sp" />

</RelativeLayout>

1 个答案:

答案 0 :(得分:2)

您正在尝试反复添加相同的实例。因此,“特定孩子已经存在”的消息。你必须创建一个具有不同ID的新模板布局实例(我想),然后尝试将其添加进来。

所以而不是:

((RelativeLayout) insertPoint).addView(v1, templateParams);

再次添加v1。创建一个新实例

v1 = vi.inflate(R.layout.form_template, null);

为好的度量设置id,然后在视图中再次添加。

我认为您不需要设置ID,但您可以详细了解id's work here