最近我一直在尝试创建一个CustomView
我正在按照教程进行操作,但是当我尝试运行代码时,我的自定义视图没有显示在我的Android屏幕上。
我的 attrs.xml 代码是: -
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="TimeView">
<attr name="text" format="string"/>
<attr name="setColor" format="boolean"/>
</declare-styleable>
</resources>
<小时/> 以下是我的CustomView的代码,即 TimeView.java : -
package com.example.custom;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.util.AttributeSet;
import android.widget.TextView;
public class TimeView
extends TextView{
public String titleText;
public boolean color;
public TimeView(Context context) {
super(context);
setTimeView();
// TODO Auto-generated constructor stub
}
public TimeView(Context c,AttributeSet as)
{
super(c,as);
TypedArray ty=c.obtainStyledAttributes(as,R.styleable.TimeView);
int count=ty.getIndexCount();
try{
for(int i=0;i<count;i++)
{
int attr=ty.getIndex(i);
if(attr==R.styleable.TimeView_text)
{
titleText=ty.getString(attr);
}
else if(attr==R.styleable.TimeView_setColor)
{
color=ty.getBoolean(attr, false);
decorate();
}
}
}
finally
{
ty.recycle();
}
}
public TimeView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setTimeView();
}
public void setTimeView()
{
SimpleDateFormat sdf=new SimpleDateFormat("hh.mm aa");
String time=sdf.format(Calendar.getInstance().getTime());
if(this.titleText!=null)
{
setText(this.titleText+" "+time);
}
else
setText(time);
}
public void decorate()
{
if(this.color==true)
{
setShadowLayer(4, 2, 2, Color.rgb(250, 00, 250));
setBackgroundColor(Color.CYAN);
}
else{
setBackgroundColor(Color.RED);
}
}
}
<小时/> 最后这是我的 activity_main.xml
的代码
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:custom="http://schemas.android.com/apk/res/com.example.custom"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.custom.MainActivity" >
<com.example.custom.TimeView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="40sp"
custom:text="My View"
custom:setColor="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
</LinearLayout>
<小时/> 我得到了这个结果: -
答案 0 :(得分:1)
只需使用我的代码覆盖您的代码即可。你只是在检索属性时犯了错误。 请勿忘记在第一行添加您的包裹名称
import java.text.SimpleDateFormat;
import java.util.Calendar;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.util.AttributeSet;
import android.widget.TextView;
public class TimeView
extends TextView {
public String titleText;
public boolean color;
public TimeView(Context context) {
super(context);
setTimeView(context, null);
}
public TimeView(Context c, AttributeSet as) {
super(c, as);
setTimeView(c, as);
}
public TimeView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setTimeView(context, attrs);
}
public void setTimeView(Context c, AttributeSet attrs) {
TypedArray a;
if (attrs != null) {
a = c.getTheme().obtainStyledAttributes(
attrs,
R.styleable.BLProgress,
0, 0);
} else {
throw new IllegalArgumentException("Must have to pass the attributes");
}
try {
titleText = a.getString(R.styleable.TimeView_text);
color = a.getBoolean(R.styleable.TimeView_setColor, false);
} finally {
a.recycle();
}
SimpleDateFormat sdf = new SimpleDateFormat("hh.mm aa");
String time = sdf.format(Calendar.getInstance().getTime());
if (this.titleText != null) {
setText(this.titleText + " " + time);
} else
setText(time);
decorate();
}
public void decorate() {
if (color) {
setShadowLayer(4, 2, 2, Color.rgb(250, 00, 250));
setBackgroundColor(Color.CYAN);
} else {
setBackgroundColor(Color.RED);
}
}
}
这是屏幕截图..