1: package com.leipei.android;
2:
3: import java.util.ArrayList;
4: import java.util.List;
5:
6: import com.leipei.rss.Message;
7: import com.leipei.rss.RssSaxParser;
8:
9: import android.app.AlertDialog;
10: import android.app.ListActivity;
11: import android.content.DialogInterface;
12: import android.content.DialogInterface.OnClickListener;
13: import android.content.Intent;
14: import android.net.Uri;
15: import android.os.Bundle;
16: import android.view.Gravity;
17: import android.view.Menu;
18: import android.view.MenuInflater;
19: import android.view.MenuItem;
20: import android.view.View;
21: import android.widget.AdapterView;
22: import android.widget.AdapterView.OnItemSelectedListener;
23: import android.widget.ArrayAdapter;
24: import android.widget.ListView;
25: import android.widget.Spinner;
26: import android.widget.Toast;
27:
28: public class RssMainActivity extends ListActivity {
29:
30: private Spinner rssSelectSpinner;
31: private String[] rssurlarray;
32: private String currentRssurl;
33: private List<Message> messages;
34:
35: /** Called when the activity is first created. */
36: @Override
37: public void onCreate(Bundle savedInstanceState) {
38: super.onCreate(savedInstanceState);
39: setContentView(R.layout.main);
40: rssSelectSpinner = (Spinner) findViewById(R.id.rssSourceSpinner);
41: loadSpinner();
42: initRssUrlArray();
43: }
44:
45: /*
46: * 初始化Rss数据源的url数组 从先前定义好的rss源的xml文件中获取rss源的名称
47: */
48: public void initRssUrlArray() {
49: this.rssurlarray = getResources().getStringArray(R.array.source_url);
50: }
51:
52: /*
53: * 初始化rss源的下拉列表
54: */
55: public void loadSpinner() {
56: ArrayAdapter<CharSequence> spinnerAdapter = ArrayAdapter
57: .createFromResource(this, R.array.source_title,
58: R.layout.newstitle);
59: spinnerAdapter
60: .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
61: rssSelectSpinner.setAdapter(spinnerAdapter);
62: rssSelectSpinner
63: .setOnItemSelectedListener(new OnItemSelectedListener() {
64:
65: public void onItemSelected(AdapterView<?> parent,
66: View view, int pos, long id) {
67: parent.setVisibility(View.VISIBLE);
68: RssMainActivity.this.currentRssurl = RssMainActivity.this.rssurlarray[pos];
69: }
70:
71: public void onNothingSelected(AdapterView parent) {
72: // Do nothing.
73: }
74: });
75: }
76:
77: /*
78: * (non-Javadoc)
79: *
80: * @see android.app.Activity#onCreateOptionsMenu(android.view.Menu)
81: * 初期只做三个菜单项,分别是更新rss,关于和退出
82: */
83: @Override
84: public boolean onCreateOptionsMenu(Menu menu) {
85: MenuInflater inflater = getMenuInflater();
86: inflater.inflate(R.menu.menu, menu);
87: return true;
88: }
89:
90: @Override
91: public boolean onOptionsItemSelected(MenuItem item) {
92: int item_id = item.getItemId();
93: switch (item_id) {
94: // 如果是点击了更新菜单,则重新加载一个rss新闻
95: case R.id.refresh:
96: this.loadRss();
97: break;
98: // 如果是点击了关于菜单,则弹出对话框,在其中显示一些关于我的信息,初期不挂赢利性广告
99: case R.id.about:
100: AlertDialog.Builder aboutDialog = new AlertDialog.Builder(this);
101: aboutDialog.setTitle(R.string.aboutme);
102: aboutDialog.setMessage(R.string.about_info);
103: aboutDialog.setPositiveButton("确定", new OnClickListener() {
104:
105: @Override
106: public void onClick(DialogInterface dialog, int which) {
107: dialog.dismiss();
108: }
109: });
110: aboutDialog.create().show();
111: break;
112: // 如果点击的是退出菜单,则退出Activity,由于整个应用程序只有一个Activity,则退出了应用程序
113: case R.id.exit:
114: this.finish();
115: break;
116: }
117: return true;
118: }
119:
120: /*
121: * 根据现在选中的spinner来加载对应的新闻
122: */
123: public void loadRss() {
124: if (this.currentRssurl == null) {
125: showTips("chose a rss url first!");
126: } else {
127: RssSaxParser rssparser = new RssSaxParser(this.currentRssurl);
128: System.out.println(this.currentRssurl);
129: this.messages = rssparser.parse();
130:
131: System.out.println("messages.size()" + this.messages.size());
132: List<String> titles = new ArrayList<String>(this.messages.size());
133: for (Message msg : this.messages) {
134: titles.add(msg.getTitle());
135: }
136: ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
137: R.layout.newstitle, titles);
138: this.setListAdapter(adapter);
139: }
140: }
141:
142: /*
143: * 显示一些提示信息
144: */
145: public void showTips(String tip) {
146: Toast toast = Toast.makeText(this, tip, Toast.LENGTH_SHORT);
147: toast.setGravity(Gravity.CENTER, 0, 10);
148: toast.show();
149: }
150:
151: /*
152: * (non-Javadoc)
153: *
154: * @see android.app.ListActivity#onListItemClick(android.widget.ListView,
155: * android.view.View, int, long)
156: * 重写ListActivity的方法,当listview中的某条新闻被点击选中,则打开对应新闻的url链接
157: */
158: @Override
159: protected void onListItemClick(ListView l, View v, int position, long id) {
160: super.onListItemClick(l, v, position, id);
161: Intent viewMessage = new Intent(Intent.ACTION_VIEW,
162: Uri.parse(this.messages.get(position).getLink()
163: .toExternalForm()));
164: this.startActivity(viewMessage);
165: }
166: }
