Adding multiple views of the same type

问题

So, I have this nice little view that I've made, which basically shows two buttons with some status labels. Nothing too complicated.

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

<LinearLayout android:orientation="horizontal"
    android:layout_width="wrap_content" android:layout_height="wrap_content">
    <ToggleButton android:text="ToggleButton" android:id="@+id/toggleButton1"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:background="@drawable/on_off">
    </ToggleButton>

    <TextView android:text="TextView" android:id="@+id/textView1"
        android:layout_height="wrap_content" android:layout_width="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:layout_marginLeft="20px" android:layout_marginRight="20px"
        android:layout_marginTop="3dp" android:layout_marginBottom="3dp">
    </TextView>
    <ImageButton android:src="@drawable/preferences"
        android:layout_height="wrap_content" android:layout_width="wrap_content"
        android:id="@+id/imageButton2" android:background="@android:color/transparent">
    </ImageButton>
</LinearLayout>

<LinearLayout android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <TextView android:id="@+id/view_monday" android:textSize="10dp" android:layout_marginRight="3dp"
        android:layout_height="wrap_content" android:layout_width="wrap_content" android:textColor="#2F4F4F"
        android:text="@string/monday_short"></TextView>
    <TextView android:id="@+id/view_tuesday" android:textSize="10dp" android:layout_marginRight="3dp"
        android:layout_height="wrap_content" android:layout_width="wrap_content" android:textColor="#2F4F4F"
        android:text="@string/tuesday_short"></TextView>
    <TextView android:id="@+id/view_wednesday" android:textSize="10dp" android:layout_marginRight="3dp"
        android:layout_height="wrap_content" android:layout_width="wrap_content" android:textColor="#2F4F4F"
        android:text="@string/wednesday_short"></TextView>
    <TextView android:id="@+id/view_thursday" android:textSize="10dp" android:layout_marginRight="3dp"
        android:layout_height="wrap_content" android:layout_width="wrap_content" android:textColor="#2F4F4F"
        android:text="@string/thursday_short"></TextView>
    <TextView android:id="@+id/view_friday" android:textSize="10dp" android:layout_marginRight="3dp"
        android:layout_height="wrap_content" android:layout_width="wrap_content" android:textColor="#2F4F4F"
        android:text="@string/friday_short"></TextView>
    <TextView android:id="@+id/view_saturday" android:textSize="10dp" android:layout_marginRight="3dp"
        android:layout_height="wrap_content" android:layout_width="wrap_content" android:textColor="#2F4F4F"
        android:text="@string/saturday_short"></TextView>
    <TextView android:id="@+id/view_sunday" android:textSize="10dp" android:layout_marginRight="3dp"
        android:layout_height="wrap_content" android:layout_width="wrap_content" android:textColor="#2F4F4F"
        android:text="@string/sunday_short"></TextView>
</LinearLayout>
</LinearLayout>

And I want to add it to my main activity with the following code:

LinearLayout root = (LinearLayout)findViewById(R.id.alarms);
View newView = View.inflate(this, R.layout.alarm, null);
alarms.add(newView);

However, it seems as if I can't add more than one of them, and I'm not sure why, or how to get around this problem to be able to add multiple copies. Furthermore, I don't know how to access individual parts, as they would all have the same id.

Thanks, Tim

回答1:

How are you trying to add the multiple copies to the 'root' LinearLayout?

If you're simply trying to call addView(newView) twice, then you're trying to add the same View object reference twice over. This is wrong because you're trying to add the same View object reference twice. I'm not entirely sure what the defined behaviour is when you do this, but I assume that addView() performs no action the second time because it checks that it already holds a reference to newView (would be grateful if anyone could confirm whether that's right or wrong).

So you need to inflate two separate instances of your child View I think, using say:

View newView0 = View.inflate(this, R.layout.alarm, null);
View newView1 = View.inflate(this, R.layout.alarm, null);

And then add them individually.

I think you'd then get around the problem of duplicate IDs by calling findViewById() on the actual child Views, as opposed to the parent:

newView0.findViewById( someID )

Update: Just tested the code in Eclipse for you. I added two child Views created from your XML file to a LinearLayout, and then changed a property (background colour to blue) of one of the Views within the second child View:

    LinearLayout root = new LinearLayout(this);
    LinearLayout newView0 = (LinearLayout)View.inflate(this, R.layout.main, null);
    LinearLayout newView1 = (LinearLayout)View.inflate(this, R.layout.main, null);
    root.addView(newView0);
    root.addView(newView1);
    setContentView(root);
    newView1.findViewById(R.id.view_monday).setBackgroundColor(0xff0000ff);

回答2:

Try to inflate the same view every time that you want to add the view. For example, if you're adding a view every time that a button is pressed you will want to declare the view outside of onClick() but assign the view inside the onCLick() method.

来源：https://stackoverflow.com/questions/6716712/adding-multiple-views-of-the-same-type

标签

android

layout

views