自定义视图扩展相对布局 [英] Custom View Extending Relative Layout

问题描述

package com.binod.customviewtest;

import android.content.Context;
import android.view.LayoutInflater;
import android.widget.RelativeLayout;

public class CustomView extends RelativeLayout{

    public CustomView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub

//      LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        LayoutInflater mInflater = LayoutInflater.from(context);
        mInflater.inflate(R.layout.custom_view  , this, true);
    }

}

包含为

<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=".MainActivity" >

    <com.binod.customviewtest.CustomView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        ></com.binod.customviewtest.CustomView>

</RelativeLayout>

自定义视图为

<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"
    >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

只要开始添加一个新的自定义视图，并收到一次错误消息即可.如果我清除此错误，则可以继续前进

Just started adding a new custom view and got the error once If I clear this then can move forward

我正在崩溃原因:android.view.InflateException:二进制XML文件第1行:错误夸大了类"

I am getting crash "Caused by: android.view.InflateException: Binary XML file line #1: Error inflating class"

推荐答案

您还需要2个构造函数.知道为什么

You need to have 2 more constructors. To know why

我是否需要所有三个构造函数Android自定义视图?

public class CustomView extends RelativeLayout{

    LayoutInflater mInflater;
    public CustomView(Context context) {
        super(context);
         mInflater = LayoutInflater.from(context);
         init(); 

    }
    public CustomView(Context context, AttributeSet attrs, int defStyle)
    {
    super(context, attrs, defStyle);
    mInflater = LayoutInflater.from(context);
    init(); 
    }
    public CustomView(Context context, AttributeSet attrs) {
    super(context, attrs);
    mInflater = LayoutInflater.from(context);
    init(); 
    }
   public void init()
   {
       View v = mInflater.inflate(R.layout.custom_view, this, true);
       TextView tv = (TextView) v.findViewById(R.id.textView1);
   tv.setText(" Custom RelativeLayout");
   }
}

我正在举一个例子.我的包裹名称不同

I am posting an example. My packagename is different

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
<com.example.testall.CustomView
        android:id="@+id/timer1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
</RelativeLayout>

custom_view.xml

custom_view.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="60dp"
        android:text="My Custom View" />

</RelativeLayout>

MainActivity.java

MainActivity.java

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        }
}

捕捉

如pskink所建议，在activity_main.xml的RelativeLayout中带有子CustomView.然后，CustomView扩展RealtiveLayout，然后再次使用RelativeLayout和子TextView为customview充气.不需要所有这些.只是一个CustomView.以编程方式创建一个TextView，然后将textview添加到RelativeLayout

As pskink suggested there in a RelativeLayout in activity_main.xml with a child CustomView. Then CustomView extends RealtiveLayout and then again you inflate a customview with RelativeLayout and a child TextView. No need for all these. Just a CustomView. Have a TextView created programatically and then add textview to RelativeLayout

activity_main.xml

activity_main.xml

<com.example.testall.CustomView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/timer1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    />

CustomView

CustomView

public class CustomView extends RelativeLayout{

    TextView tv;
    public CustomView(Context context) {
        super(context);
         tv = new TextView(context);
         init(); 

    }
    public CustomView(Context context, AttributeSet attrs, int defStyle)
    {
    super(context, attrs, defStyle);
    tv = new TextView(context);
    init(); 
    }
    public CustomView(Context context, AttributeSet attrs) {
    super(context, attrs);
    tv = new TextView(context);
    init(); 
    }
   public void init()
   {
       this.addView(tv);
       tv.setText(" Custom RelativeLayout");
   }
}

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