android使用include调用内部组件的方法
作者：3H
这篇文章主要介绍了android使用include调用内部组件的方法,涉及Android组件调用的相关技巧,需要的朋友可以参考下
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。