Android ApiDemos示例解析(154):Views->Layouts->ScrollView->2. Long
本例使用ScrollView显示一个长列表,其定义的scroll_view_2.xml
<ScrollView xmlns:android=”http://schemas.android.com/apk/res/android”android:layout_width=”match_parent”android:layout_height=”wrap_content”android:scrollbars=”none”><LinearLayoutandroid:id=”@+id/layout”android:orientation=”vertical”android:layout_width=”match_parent”android:layout_height=”wrap_content”><TextViewandroid:layout_width=”match_parent”android:layout_height=”wrap_content”android:text=”@string/scroll_view_2_text_1″/><Buttonandroid:layout_width=”match_parent”android:layout_height=”wrap_content”android:text=”@string/scroll_view_2_button_1″/></LinearLayout></ScrollView>
ScrollView 只定义了一个TextView 和 Button在LinearLayout中,而在ScrollView2.java 使用代码为LinearLayout 动态添加了63个TextView 和Button:
LinearLayout layout = (LinearLayout) findViewById(R.id.layout);for (int i = 2; i < 64; i++) { TextView textView = new TextView(this); textView.setText("Text View " + i); LinearLayout.LayoutParams p = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT ); layout.addView(textView, p); Button buttonView = new Button(this); buttonView.setText("Button " + i); layout.addView(buttonView, p);}
从而构成一个长列表,一屏肯定显示不下,此时就可以滚动屏幕来显示: