我开始学习Android开发,所以这个问题可能听起来有些愚蠢。 我尝试使用我创建的模板在父布局中扩展子布局,但是它会抛出错误:指定的子级已经有父级。您必须首先在孩子的父母上调用removeView() 这是我的代码:
activity_main.xml中
<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.codingrabbit.spandan.rabbit101.MainActivity">
<include
layout="@layout/toolbar"
android:id="@+id/toolbar">
</include>
<LinearLayout
android:id="@+id/contents"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/toolbar"
android:layout_centerHorizontal="true">
</LinearLayout>
</RelativeLayout>
special_buttons.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/special_button"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Subject"
android:textSize="20sp"
android:textColor="@color/white"
android:textAlignment="center"
android:background="@color/blue"
android:id="@+id/subjectText"
android:layout_gravity="center_horizontal" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="70dp"
android:text="Details"
android:textSize="18sp"
android:textAlignment="center"
android:textColor="@color/white"
android:background="@color/green"
android:paddingRight="16dp"
android:paddingLeft="16dp"
android:id="@+id/detailsText"
android:layout_gravity="center_horizontal" />
</LinearLayout>
toolbar.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/toolbar"
android:theme="@style/Theme.AppCompat.Light.NoActionBar"
android:background="@color/colorPrimary"
android:fitsSystemWindows="true"
android:minHeight="?attr/actionBarSize">
</android.support.v7.widget.Toolbar>
MainActivity.java
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Toolbar Setup:
toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setTitle("Main Menu");
toolbar.setTitleTextColor(getResources().getColor(R.color.white));
//Adding special buttons:
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
LinearLayout parent = (LinearLayout) findViewById(R.id.contents);
for(int i=0; i<3; i++){
View custom = inflater.inflate(R.layout.special_buttons, parent, true);
TextView subText = (TextView) custom.findViewById(R.id.subjectText);
TextView detailsText = (TextView) custom.findViewById(R.id.detailsText);
subText.setText("Subject: "+(i+1));
detailsText.setText("Details of subject " + (i + 1));
parent.addView(custom); //this is where the error is diplayed
}
setContentView(parent);
}
}
答案 0 :(得分:1)
如果为inflate
提供true作为第三个参数,则膨胀的视图会自动添加到parent
(第二个参数),并返回父本身。因此,在您的情况下,您尝试向parent
添加两次相同的视图,正如错误所指出的那样,这是不可能的。
更改
inflater.inflate(R.layout.special_buttons, parent, true);
与
inflater.inflate(R.layout.special_buttons, parent, false);
你会得到你期望的行为
答案 1 :(得分:0)
inflater.inflate(R.layout.special_buttons,parent,false);