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);
}
}
包括为
<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 View 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>
刚开始添加一个新的自定义 View 并得到一次错误如果我清除它然后可以继续前进
我遇到崩溃“原因:android.view.InflateException: Binary XML file line #1: Error inflating class”
最佳答案
您还需要有 2 个构造函数。想知道为什么
Do I need all three constructors for an Android custom view?
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");
}
}
我正在发布一个示例。我的包名不同
<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
<?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
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
捕捉
正如pskink 在activity_main.xml
中的RelativeLayout 中建议的那样,带有一个子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。只是一个自定义 View 。以编程方式创建一个 TextView,然后将 textview 添加到 RelativeLayout
编辑:
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"
/>
自定义 View
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");
}
}
关于android - 自定义 View 扩展相对布局,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22779422/