tips和坑

记录那些经常用却又打死记不住的代码(持续更新)

Posted by alonealice on 2017-08-02

时间固定格式转Long

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SimpleDateFormat simpleDateFormat = new SimpleDateFormat(style);
Date date = simpleDateFormat.parse(time);
return date.getTime();

组合属性动画

方法1：

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PropertyValuesHolder holder1=
PropertyValuesHolder.ofFloat("scaleX",1.0f,1,5f);
...
ObjectAnimator animator=ObjectAnimator.
ofPropertyValuesHolder(view,holder1,holder2,holder3);

方法2：

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AnimatorSet set=new AnimatorSet();
AnimatorSet.Builder builder=set.play(animator1);
builder.after(animator2);
set.start();

方法3：

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 AnimatorInflater.loadAnimator(context,R.animator.t);
 动画配置文件：
 <set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="200"
    android:ordering="together">
    <objectAnimator
        android:propertyName="translationX"></objectAnimator>
    <objectAnimator
        android:propertyName="translationY"></objectAnimator>
</set>

DOM解析xml

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DocumentBuilderFactory builderFactory=DocumentBuilderFactory.newInstance();
           DocumentBuilder documentBuilder=builderFactory.newDocumentBuilder();
           Document document= documentBuilder.parse(inputStream);
           Element rootNode=document.getDocumentElement();
           NodeList nodeList=rootNode.getChildNodes();
           ...

PULL解析

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XmlResourceParser xmlResourceParser= getResources().getLayout(id);
AttributeSet attrs=Xml.asAttributeSet(xmlResourceParser);
 while(XmlPullParser.END_DOCUMENT!=xmlResourceParser.getEventType()){
  if(xmlResourceParser.getEventType()==XmlPullParser.START_TAG&&xmlResourceParser.getName().equals("item")){//条件满足，解析具体的值
                   int a=obtainStyledAttributes(attrs, R.styleable.MenuItem).getInt(R.styleable.CircleImage2_d3,0);
               }
      XmlPullParser.next();         
 }

SAX解析

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SAXParserFactory sax=SAXParserFactory.newInstance();
InputStream inputStream=getResources().openRawResource(R.raw.sax);
SAXParser saxParser= sax.newSAXParser();
saxParser.parse(inputStream,new DefaultHandler(){
                  @Override
                  public void startDocument() throws SAXException {
                      super.startDocument();
                  }

                  @Override
                  public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
                      super.startElement(uri, localName, qName, attributes);
                  }

                  @Override
                  public void endElement(String uri, String localName, String qName) throws SAXException {
                      super.endElement(uri, localName, qName);
                  }

                  @Override
                  public void endDocument() throws SAXException {
                      super.endDocument();
                  }

                  @Override
                  public void characters(char[] ch, int start, int length) throws SAXException {
                      super.characters(ch, start, length);
                  }
              });

其中characters是解析具体的数据时的回调，在startDocument、startElement和endElement方法执行。




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