从代码更改活动背景

Question

我有一个背景活动:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:minWidth="25px"
android:minHeight="25px"
android:background="@drawable/background_fingerboard" />

如何从代码中更改背景图像？我实际上使用单声道,但Java样本也会有所帮助.

Answer 1

首先在布局xml中添加LinearLayout id:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/linearLayoutid" 
android:minWidth="25px"
android:minHeight="25px"
android:background="@drawable/background_fingerboard" 

并在代码部分设置背景为::

LinearLayout  linearLayout = (LinearLayout) findViewById(R.id.linearLayoutid);
 linearLayout.setBackgroundResource(R.drawable.background_fingerboard);