android 使用include 调用内部组件
16lz
2022-07-25
阅读更多 例子一:
sublayout.xml
<?xml version="1.0" encoding="utf-8"?>
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#505050"
>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="SubLayout"
/>
mail.xml
<?xml version="1.0" encoding="utf-8"?>
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
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"?>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="SubLayout"
/>
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
sublayout.xml
<?xml version="1.0" encoding="utf-8"?>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#505050"
>
android:layout_height="wrap_content"
android:text="SubLayout"
/>
mail.xml
<?xml version="1.0" encoding="utf-8"?>
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
android:layout_height="wrap_content"
android:text="@string/hello"
/>
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"?>
android:layout_height="wrap_content"
android:text="SubLayout"
/>
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
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