Android開發教程：讓 TextView 的事件響應支持 Intent

按這一篇（http://www.linuxidc.com/Linux/2011-10/45649.htm）的方式可以給 TextView 加上事件響應，然而僅限於 web、email、phone、map等幾種，如果希望在點擊後跳轉到自己的 Activity 要怎麼實現呢？看代碼吧！

這是 Activity 代碼：

1. @Override
2. public void onCreate(Bundle icicle) {
3. super.onCreate(icicle);
5. linkify = new LinkifyUtil(this);
6. Intent intent = new Intent("com.example.Android.note.ADD");
7. intent.setData(Uri.parse("content://com.example.android.note/item"));
9. linkify.addIntentLink(intent, (TextView) findViewById(R.id.tv_new_item));
10. }

這是 LinkifyUtil 類：

1. package com.example.android.note.util;
3. import android.app.Activity;
4. import android.content.Intent;
5. import android.text.SpannableString;
6. import android.text.Spanned;
7. import android.text.method.LinkMovementMethod;
8. import android.view.View;
9. import android.view.View.OnClickListener;
10. import android.widget.TextView;
12. /**
13. *
14. * @author eidolon
15. */
16. public class LinkifyUtil {
17. private final Activity currentActivity;
19. public LinkifyUtil(Activity activity) {
20. this.currentActivity = activity;
21. }
23. public void addIntentLink(final Intent intent, final TextView view, final int start, final int end) {
24. CharSequence source = view.getText();
25. if (source instanceof Spanned) {
26. IntentSpan[] spans = ((Spanned) source).getSpans(start, end, IntentSpan.class);
27. if (spans.length > 0) {
28. return;
29. }
30. }
32. SpannableString spannableString = new SpannableString(source);
33. spannableString.setSpan(new IntentSpan(new OnClickListener() {
35. public void onClick(View view) {
36. currentActivity.startActivity(intent);
37. }
38. }), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
40. view.setText(spannableString);
41. view.setMovementMethod(LinkMovementMethod.getInstance());
42. }
44. public void addIntentLink(final Intent intent, final TextView view) {
45. addIntentLink(intent, view, 0, view.getText().toString().length());
46. }
47. }

最後是 IntentSpan 類：

1. package com.example.android.note.util;
3. import android.text.style.ClickableSpan;
4. import android.view.View;
5. import android.view.View.OnClickListener;
7. /**
8. *
9. * @author eidolon
10. */
11. public class IntentSpan extends ClickableSpan {
13. private final OnClickListener listener;
15. public IntentSpan(View.OnClickListener listener) {
16. this.listener = listener;
17. }
19. @Override
20. public void onClick(View view) {
21. listener.onClick(view);
22. }
23. }