Android開(kāi)發(fā)自定義TextView省略號(hào)樣式的方法

<TextView
    android:id="@+id/textView4"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:maxLines="2"
    android:ellipsize="end"
    android:text="This is a text of TextView This is a text of TextView This is a text of TextView This is a text of TextView This is a text of TextView"
    android:textSize="20sp" />

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final TextView textView = (TextView)findViewById(R.id.textView4);
    Layout layout = textView.getLayout();//此時(shí)的layout為null，必須用觀察者模式的回調(diào)函數(shù)來(lái)獲取layout
    System.out.println("layout是"+layout);//此處為null
    ViewTreeObserver observer = textView.getViewTreeObserver();
    observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
      boolean isfirstRunning = true;
      @Override
      public void onGlobalLayout() {//此方法會(huì)被調(diào)用兩次,每執(zhí)行一次settext就會(huì)執(zhí)行一次，第一次是顯示全部的文本，不加省略，第二次是加上省略,將會(huì)刪減兩次文本
        // TODO Auto-generated method stub
        if(isfirstRunning==false)return;//如果不加這一行的條件，出來(lái)之后是完整單詞+。。。，如果加上，出來(lái)就是截?cái)嗟膯卧~+。。。
        Layout layout2 = textView.getLayout();
        System.out.println("layout2是"+layout2);
        if(textView!=null&&layout2!=null){
          int lines = layout2.getLineCount();
          System.out.println("當(dāng)前行數(shù)是"+layout2.getLineCount());
          System.out.println("被省略的字符數(shù)量是"+layout2.getEllipsisCount(lines-1));//看看最后一行被省略掉了多少
          System.out.println("被省略的字符起始位置是"+layout2.getEllipsisStart(lines-1));//看看最后一行被省略的起始位置
          System.out.println("最后一個(gè)可見(jiàn)字符的偏移是"+layout2.getLineVisibleEnd(lines-1));
          //開(kāi)始替換系統(tǒng)省略號(hào)
          if(lines<2)return;//如果只有一行，就不管了
          if(layout2.getEllipsisCount(lines-1)==0)return;//如果被省略的字符數(shù)量為0，就不管了
          String showText = textView.getText().toString();
          System.out.println("刪減前"+showText);
          showText = showText.substring(0, layout2.getLineVisibleEnd(lines-1)-6).concat("。。。");//在此處自定義要顯示的字符
          System.out.println("刪減后"+showText);
          textView.setText(showText);
          isfirstRunning=false;
        }
      }
    });