本文實例講述了android使用include調用內部組件的方法。分享給大家供大家參考。具體如下：
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>
如何調用組件include進來的組件呢。
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進來的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>
則以上的方法將不能實現，會報空指針。
因為用了merge后，導入進來就相當于是當前view下的組件了，所以直接findViewById就可以了。
這樣的話。。。可以解決了include 多次同一個layout的問題
希望本文所述對大家的Android程序設計有所幫助。
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