android使用include调用内部组件的方法
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2022-11-05 13:44:04
本文实例讲述了android使用include调用内部组件的方法。分享给大家供大家参考。具体如下：
例子一：
sublayout.xml
本文实例讲述了android使用include调用内部组件的方法。分享给大家供大家参考。具体如下：
例子一：
sublayout.xml
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="#505050" > <textview android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="sublayout" /> <button android:id="@+id/mybutton" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text=" a button " /> </linearlayout> mail.xml <?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <textview android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <include android:id="@+id/main1" layout="@layout/sublayout" /> <include android:id="@+id/main2" layout="@layout/sublayout" /> <button android:id="@+id/startanotheractivity" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text=" start another activity " /> </linearlayout>
如何调用组件include进来的组件呢。
package com.androidincludelayout;
import android.app.activity;
import android.content.intent;
import android.os.bundle;
import android.view.view;
import android.widget.button;
import android.widget.toast;
public class androidincludelayout extends activity {
/** called when the activity is first created. */
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.main);
view sublayout1 = (view)findviewbyid(r.id.main1);
view sublayout2 = (view)findviewbyid(r.id.main2);
button mybutton_main1 = (button)sublayout1.findviewbyid(r.id.mybutton);
button mybutton_main2 = (button)sublayout2.findviewbyid(r.id.mybutton);
button startanotheractivity = (button)findviewbyid(r.id.startanotheractivity);
startanotheractivity.setonclicklistener(new button.onclicklistener(){
@override
public void onclick(view arg0) {
// todo auto-generated method stub
intent intent = new intent();
intent.setclass(androidincludelayout.this, anotheractivity.class);
startactivity(intent);
}});
mybutton_main1.setonclicklistener(new button.onclicklistener(){
@override
public void onclick(view arg0) {
// todo auto-generated method stub
toast.maketext(androidincludelayout.this, "button 1 pressed", toast.length_long).show();
}});
mybutton_main2.setonclicklistener(new button.onclicklistener(){
@override
public void onclick(view arg0) {
// todo auto-generated method stub
toast.maketext(androidincludelayout.this, "button 2 pressed", toast.length_long).show();
}});
}
}
但是如果include进来的xml，是
sublayout.xml
<?xml version="1.0" encoding="utf-8"?> <merge xmlns:android="http://schemas.android.com/apk/res/android"> <textview android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="sublayout" /> <button android:id="@+id/mybutton" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text=" a button " /> </merge>
则以上的方法将不能实现，会报空指针。
因为用了merge后，导入进来就相当于是当前view下的组件了，所以直接findviewbyid就可以了。
这样的话。。。可以解决了include 多次同一个layout的问题
希望本文所述对大家的android程序设计有所帮助。