以编程方式创建多个LinearLayouts

时间:2012-11-23 18:50:44

标签: android android-layout textview android-linearlayout

我正在尝试创建linearLayout的多个实例。我创建了我的布局文件(下面)。我把它放在自己的布局文件中,从另一个文件(main_activity.xml)中我想在滚动视图中添加动态数量的线性布局实例。我知道我可以在我的java代码中以编程方式创建相同的linearlayout并循环遍历它,但我不愿意(主要有两个原因)

  1. 在我的java类中创建大量布局开始使我的代码看起来很乱:)。
  2. 我喜欢在XML中使用布局和使用Java编写逻辑的范例。
  3. 我是否可以将我的逻辑保留在java中,然后只是动态创建/实例化我的线性布局的多个“实例”。我的猜测是有一个简单的解决方案,但我的新手状态使我解决它的能力蒙上阴影。出于某种原因,我的java代码可以找到LinearLayout但无法找到第一个TextView(@ + id / submittedBy)。

    非常感谢, 克雷格

    Java Logic

      ScrollView sv = (ScrollView) findViewById(R.id.existingCommentsScrollView);
        //DEBUGGING LOOP- REMOVE ME
        for(int i=0;i<30;i++){
            LinearLayout ll = (LinearLayout)findViewById(R.id.existingCommentLinearLayout);
    
            TextView submittedByTextView = (TextView) findViewById(R.id.submittedBy);
            submittedByTextView.setText("Craig " +i);
    
            TextView submittedDate = (TextView) findViewById(R.id.dateField);
            submittedDate.setText("SubmittedDate " +i);
    
            RatingBar showRating = (RatingBar) findViewById(R.id.userShowRating);
            showRating.setRating(3);
    
            RatingBar soundRating = (RatingBar) findViewById(R.id.userSoundRating);
            soundRating.setRating(1);
    
            EditText commentText = (EditText) findViewById(R.id.userCommentEditText);
            commentText.setText("THIS IS WHERE MY TEXT GOES FOR "+i+" I could add more too");
    
            sv.addView(ll);
        }
        sv.refreshDrawableState();
    

    布局:

     <?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:background="@drawable/linear_layout_border"
    android:orientation="vertical"
    android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
    
    <RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#000000"
        android:paddingBottom="4dp"
        android:paddingLeft="4dp"
        android:paddingRight="4dp"
        android:paddingTop="4dp"
        android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
    
        <TextView
            android:id="@+id/submittedBy"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:gravity="center_horizontal"
            android:inputType="none"
            android:paddingBottom="1dp"
            android:paddingLeft="4dp"
            android:paddingRight="10dp"
            android:paddingTop="1dp"
            android:text="NameGoesHere"
            android:textColor="#E6E6E6"
            android:textSize="8sp" />
    
        <TextView
            android:id="@+id/dateField"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@id/submittedBy"
            android:ems="10"
            android:paddingBottom="1dp"
            android:paddingLeft="4dp"
            android:paddingRight="10dp"
            android:paddingTop="1dp"
            android:text="DateGoesHere"
            android:textColor="#E6E6E6"
            android:textSize="8sp" />
    </RelativeLayout>
    
    <RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#000000"
        android:paddingBottom="4dp"
        android:paddingLeft="4dp"
        android:paddingRight="4dp"
        android:paddingTop="4dp"
        android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
    
        <TextView
            android:id="@+id/userShowRatingTextView"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:gravity="center_horizontal"
            android:inputType="none"
            android:paddingBottom="1dp"
            android:paddingLeft="4dp"
            android:paddingRight="10dp"
            android:paddingTop="1dp"
            android:text="Show Rating"
            android:textColor="#E6E6E6"
            android:textSize="8sp" />
    
        <RatingBar
            android:id="@+id/userShowRating"
            style="?android:attr/ratingBarStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@id/userShowRatingTextView" />
    </RelativeLayout>
    
    <RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#000000"
        android:paddingBottom="4dp"
        android:paddingLeft="4dp"
        android:paddingRight="4dp"
        android:paddingTop="4dp"
        android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
    
        <TextView
            android:id="@+id/userSoundRatingTextView"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_toRightOf="@id/userShowRating"
            android:gravity="center_horizontal"
            android:inputType="none"
            android:paddingBottom="1dp"
            android:paddingLeft="4dp"
            android:paddingRight="10dp"
            android:paddingTop="1dp"
            android:text="Sound Rating"
            android:textColor="#E6E6E6"
            android:textSize="8sp" />
    
        <RatingBar
            android:id="@+id/userSoundRating"
            style="?android:attr/ratingBarStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@id/userSoundRatingTextView" />
    </RelativeLayout>
    
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    
        <EditText
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/editText2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#000000"
            android:inputType="none"
            android:paddingBottom="4dp"
            android:paddingLeft="4dp"
            android:paddingRight="4dp"
            android:paddingTop="4dp"
            android:text="Comment Goes Here"
            android:textColor="#E6E6E6"
            android:textSize="12sp"
            android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
    
            <requestFocus />
        </EditText>
    </RelativeLayout>
    

1 个答案:

答案 0 :(得分:0)

你没有遇到任何异常?我指的是循环中的最后一行,在每次迭代中将LinearLayout添加到ScrollView。您可能正在尝试对您的布局文件进行充气,然后将其添加到ScrollView,如下所示:

ScrollView sv = (ScrollView) findViewById(R.id.existingCommentsScrollView);
// I assume this LinearLayout is the only child of the ScrollView above
LinearLayout ll = (LinearLayout)findViewById(R.id.existingCommentLinearLayout);
for(int i=0;i<30;i++){        
    // R.layout.the_layout_file is your layout from the question
    View inflatedView = getLayoutInflater().inflate(R.layout.the_layout_file, ll, false);
    TextView submittedByTextView = (TextView) inflatedView.findViewById(R.id.submittedBy);
    submittedByTextView.setText("Craig " +i);

    TextView submittedDate = (TextView) inflatedView.findViewById(R.id.dateField);
    submittedDate.setText("SubmittedDate " +i);

    RatingBar showRating = (RatingBar) inflatedView.findViewById(R.id.userShowRating);
    showRating.setRating(3);

    RatingBar soundRating = (RatingBar) inflatedView.findViewById(R.id.userSoundRating);
    soundRating.setRating(1);

    EditText commentText = (EditText) inflatedView.findViewById(R.id.userCommentEditText);
    commentText.setText("THIS IS WHERE MY TEXT GOES FOR "+i+" I could add more too");

    ll.addView(inflatedView);
}

另外,请记住,您要添加大量视图,以避免流畅的界面。