android 帶箭頭的textview文字伸縮效果

android 帶箭頭的textview文字伸縮效果

雖然是自己做的 還是不太懂 都是看網上的方法自己總結的 如果大家有品質好的demo 請分享一下

主要就是一個方法 幾個變數限制 xml檔案就不貼了 普通的TextView

 

public class TextViewActivity extends Activity {private TextView tv;private String status = "up";private String str = "Android是一種基於Linux的自由及開放原始碼的作業系統，主要使用於行動裝置，如智能手機和平板電腦，由Google公司和開放手機聯盟領導及開發。";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());}}