找到在XML布局文件中定义的VIEW控件
为了找到一个在XML布局文件中被定义的View控件，首先要做的是在控件定义中添加android:id属性。如下：
1 2 3 4 5 6 7 | <?xml version="1.0" encoding="utf-8"?> <Button xmlns:android="http://schemas.android.com/apk/res/android" android:id ="@+id/btn_search" android:gravity="center" android:layout_width ="300px" android:layout_height = "wrap_content" android:text ="Search" /> |
编译时会自动在R.java文件中添加该按钮的android:id定义，如：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | package org.gooss.android.linearlayout; public final class R { //..... public static final class id { public static final int btn_search=0x7f050000; } public static final class layout { public static final int main=0x7f030000; } public static final class string { public static final int app_name=0x7f040000; public static final int red=0x7f040001; } // ...... } |
在一个Activity中找到该按钮也非常简单：
1 2 | /* Find the Button from our XML-layout. */ Button b = (Button) this.findViewById(R.id.btn_search ); |
如果Eclipse不能找到Button类,只要敲击”Ctrl+Shift+O”即可自动导入：
1 | import android.widget.Button; |
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