android 带箭头的textview文字伸缩效果

虽然是自己做的还是不太懂都是看网上的方法自己总结的如果大家有质量好的demo 请分享一下

主要就是一个方法几个变量限制 xml文件就不贴了普通的TextView

public class TextViewActivity extends Activity {private TextView tv;private String status = "up";private String str = "Android是一种基于Linux的自由及开放源代码的操作系统，主要使用于移动设备，如智能手机和平板电脑，由Google公司和开放手机联盟领导及开发。";private String str_show = "";private int maxlength = 50;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tv = (TextView) findViewById(R.id.textView1);if (str.length() < maxlength) {tv.setText(str);} else {changStatus();}}private void changStatus() {tv.setText("");Drawable drawable = null;if (status.equals("down")) {drawable = getResources().getDrawable(R.drawable.icon_arrow_up);status = "up";str_show = str;tv.setMaxLines(10000);} else if (status.equals("up")) {drawable = getResources().getDrawable(R.drawable.icon_arrow_down);status = "down";tv.setMaxLines(2);str_show = str.substring(0, maxlength);str_show += "...";}String spanString = str_show;spanString = spanString.substring(0, spanString.length());drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight());SpannableString spannable = new SpannableString(spanString.toString()+ "s");ImageSpan span = new ImageSpan(drawable, ImageSpan.ALIGN_BASELINE);spannable.setSpan(span, spanString.toString().length(), spanString.toString().length() + "s".length(),Spannable.SPAN_INCLUSIVE_EXCLUSIVE);ClickableSpan rightClickableSpan = new ClickableSpan() {@Overridepublic void onClick(View view) {changStatus();}};spannable.setSpan(rightClickableSpan, spanString.toString().length(),spanString.toString().length() + "s".length(),Spannable.SPAN_INCLUSIVE_EXCLUSIVE);tv.setText(spannable);tv.setMovementMethod(new MyTouch());}}

更多相关文章

随机推荐