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我是 android 新手,我正在尝试在另一个布局下方动态添加 1 个布局。我以前已经看过类似的问题和答案,但我似乎找不到自己的方式。我希望有人可以为我解决问题。

我有要添加第二个布局的主要布局(import_custom_fields):

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

    <RelativeLayout 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingBottom="6dp">

        <FrameLayout
         android:clickable="true"   
         android:id="@+id/profile_picture_frame"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_margin="10dp"
         android:foreground="@drawable/selector">

        <ImageView
            android:id="@+id/ProfilePicture"
            android:layout_width="@dimen/profile_picture_size"
            android:layout_height="@dimen/profile_picture_size"
            android:scaleType="centerCrop"
            android:contentDescription="@string/menu_profile_picture_header"
            android:src="@drawable/ic_contact_picture" />

        <ImageView
            android:id="@+id/addPlus"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/menu_profile_picture_add"
            android:layout_gravity="bottom|right"
            android:src="@drawable/plus" />

        </FrameLayout>

        <LinearLayout 
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:layout_toRightOf="@+id/profile_picture_frame"
            android:layout_centerVertical="true">

            <EditText
                android:id="@+id/FirstNameEdit"
                android:tag="@string/vcard_tag_first_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginRight="10dp"
                android:textAppearance="@android:style/TextAppearance.Large"
                android:hint="@string/first_name"
                android:inputType="textPersonName|textCapWords"
                android:lines="1"/>
            <EditText
                android:id="@+id/LastNameEdit"
                android:tag="@string/vcard_tag_last_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginRight="10dp"
                android:textAppearance="@android:style/TextAppearance.Large"
                android:hint="@string/last_name"
                android:inputType="textPersonName|textCapWords"
                android:lines="1" />  
        </LinearLayout>
    </RelativeLayout>
</LinearLayout>
</ScrollView>

第二个布局(fields_to_inflate):

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fields_to_inflate"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >    

    <Spinner
        android:id="@+id/spinnerPhone"
        android:layout_width="100dip"
        android:layout_marginTop="10dip"
        android:layout_marginLeft="10dip"
        android:layout_height="wrap_content" />

    <EditText
        android:id="@+id/editTextPhone"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/spinnerPhone"
        android:layout_toRightOf="@+id/spinnerPhone"
        android:inputType="phone"
        android:ems="10" >
    </EditText>
</RelativeLayout>

最后,我的活动如下所示:

public class ImportCustomFields extends SherlockActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.import_custom_fields);

        Spinner spinner = (Spinner)findViewById(R.id.spinnerPhone);
        ImageView addField = (ImageView)findViewById(R.id.add);
        addField.setClickable(true);

        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
                                                                             R.array.custom_fields,
                                                                             android.R.layout.simple_spinner_item);

        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);

        final LinearLayout mainLayout = (LinearLayout)findViewById(R.layout.import_custom_fields);
        final RelativeLayout inflateLayout = (RelativeLayout)View.inflate(this, R.layout.fields_to_inflate, null);

        addField.setOnClickListener(new OnClickListener() {         
            @Override
            public void onClick(View v) {
                mainLayout.addView(inflateLayout);  
            }
        });
    }
}

我在这一行( mainLayout.addView(inflateLayout) )收到空异常错误。

4

1 回答 1

2

您应该使用您分配的布局的 id:

final LinearLayout mainLayout = (LinearLayout)findViewById(R.id.import_custom_field);
于 2013-01-31T17:52:42.470 回答