R.id访问每个组件是正常的Android Studio [英] Android Studio is it normal for R.id to access every components
问题描述
我正在开发一个小的Android Studio(版本2.2.3)应用程序.
I am working on a little Android Studio (version 2.2.3) application.
在添加了包含大量组件的第二个活动之后,我注意到当我在第一个活动中键入R.id时,自动完成功能会向我建议第二个活动中的组件.
After adding a second activity with a lot of components I noticed that when I type R.id in the first activity, the auto-completion proposes me the components from the second activity.
这正常吗?
这是我的问题的一个有效示例(我截取了屏幕截图),为简单起见,我仅创建了两个空的活动,每个活动都有一个按钮.
And here is a working example of my issue (I took the screenshot from it), for simplicity I just created two empty activities each one with a button.
AndroidManifest.xml:
AndroidManifest.xml :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapplication">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Main2Activity"></activity>
</application>
MainActivity.java:
MainActivity.java :
package com.example.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
private Button btMain1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Here is the issue,
//autocompletion of R.id. shows every layout and their composents
btMain1 = (Button) findViewById(R.id.);
}
}
activity_main.xml:
activity_main.xml :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.myapplication.MainActivity">
<Button
android:text="Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="198dp"
android:id="@+id/btMain1" />
</RelativeLayout>
Main2Activity.java:
Main2Activity.java :
package com.example.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Button;
public class Main2Activity extends AppCompatActivity {
private Button btMain2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
}
}
activity_main2.xml:
activity_main2.xml :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.myapplication.Main2Activity">
<Button
android:text="Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="198dp"
android:id="@+id/btMain2" />
</RelativeLayout>
推荐答案
R.java
is a generated file containing all the resource identifiers for your application.
R.id
只是一个子类.您还会看到R.layout
自动完成,例如在setContentView
R.id
is just one subclass. You also would see R.layout
auto-complete, for example on setContentView
自动完成将提取所有内容,因为活动,片段,服务等内部没有隔离.
The auto-completion will pull everything because there is no isolation inside of activities, fragments, services, etc.
(我的摘录)
/* AUTO-GENERATED FILE. DO NOT MODIFY.
*
* This class was automatically generated by the
* aapt tool from the resource data it found. It
* should not be modified by hand.
*/
public final class R {
// ...
public static final class id {
public static final int action0=0x7f0e0090;
public static final int action_bar=0x7f0e0060;
public static final int action_bar_activity_content=0x7f0e0000;
public static final int action_bar_container=0x7f0e005f;
public static final int action_bar_root=0x7f0e005b;
public static final int action_bar_spinner=0x7f0e0001;
public static final int action_bar_subtitle=0x7f0e0041;
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