android 带箭头的textview文字伸缩效果

标签：android   textview   文字伸缩   

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;

	@Override
	protected 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() {

			@Override
			public 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());

	}

}

android 带箭头的textview文字伸缩效果

标签：android   textview   文字伸缩   

原文地址：http://blog.csdn.net/u012885461/article/details/46457903