Question

我有一个我在一个活动中解析过的Rss Feed。每个项目都附有一个单独的URL。当在列表视图中单击某个项目时，它将打开另一个活动，显示我从正在解析的xml中定义的特定文本。我在该视图中有一个按钮，我想从该项目的xml文件中分配url。我唯一无法弄清楚的是如何将url信息串到该按钮。这是我正在使用的代码。

xml解析活动

public class AndroidXMLParsingActivity extends ListActivity {

// All static variables
static final String URL = "http://www.cpcofc.org/devoapp.xml";
// XML node keys
static final String KEY_ITEM = "item"; // parent node
static final String KEY_ID = "item";
static final String KEY_NAME = "title";
static final String KEY_COST = "description";
static final String KEY_DESC = "description";
static final String KEY_GUID = "guid";
static final String KEY_LINK = "link";

ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    final ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();

    XMLParser parser = new XMLParser();
    String xml = parser.getXmlFromUrl(URL); // getting XML
    Document doc = parser.getDomElement(xml); // getting DOM element

    NodeList nl = doc.getElementsByTagName(KEY_ITEM);
    // looping through all item nodes <item>
    for (int i = 0; i < nl.getLength(); i++) {
        // creating new HashMap
        HashMap<String, String> map = new HashMap<String, String>();
        Element e = (Element) nl.item(i);
        // adding each child node to HashMap key => value
        map.put(KEY_ID, parser.getValue(e, KEY_ID));
        map.put(KEY_NAME, parser.getValue(e, KEY_NAME));
        map.put(KEY_COST, parser.getValue(e, KEY_COST));
        map.put(KEY_DESC, parser.getValue(e, KEY_DESC));
        map.put(KEY_GUID, parser.getValue(e, KEY_GUID));
        map.put(KEY_LINK, parser.getValue(e,KEY_LINK));


        // adding HashList to ArrayList
        menuItems.add(map);
    }

    // Adding menuItems to ListView
    ListAdapter adapter = new SimpleAdapter(this, menuItems,
            R.layout.list_item,
            new String[] { KEY_DESC, KEY_NAME, KEY_COST, KEY_GUID}, new int[] {
                    R.id.desciption, R.id.name, R.id.cost});

    setListAdapter(adapter);

    Collections.reverse(menuItems);

    // selecting single ListView item
    ListView lv = getListView();

    lv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            // getting values from selected ListItem
            String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
            String cost = ((TextView) view.findViewById(R.id.cost)).getText().toString();
            Uri uriUrl = Uri.parse(menuItems.get(position).get(KEY_GUID));

            // Starting new intent
            Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
            in.putExtra(KEY_NAME, name);
            in.putExtra(KEY_COST, cost);
            in.putExtra(KEY_GUID, uriUrl);
            startActivity(in);

        }
    });
}
 }

具有按钮以查看其中的网址的第二个活动

public class SingleMenuItemActivity  extends Activity {

// XML node keys
static final String KEY_NAME = "title";
static final String KEY_COST = "description";
static final String KEY_DESC = "description";
static final String KEY_GUID = "guid";


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.single_list_item);

    // getting intent data
    final Intent in = getIntent();

    // Get XML values from previous intent
    String name = in.getStringExtra(KEY_NAME);
    String cost = in.getStringExtra(KEY_DESC);
    String description = in.getStringExtra(KEY_DESC);
    String uriUrl = in.getStringExtra(KEY_GUID);

    // Displaying all values on the screen
    TextView lblName = (TextView) findViewById(R.id.name_label);
    TextView lblCost = (TextView) findViewById(R.id.cost_label);
    TextView lblDesc = (TextView) findViewById(R.id.description_label);


    lblName.setText(name);
    lblCost.setText(cost);
    lblDesc.setText(description);

Button devo = (Button) findViewById(R.id.button1);
devo.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v){
        String url = "http://www.google.com";
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setData(Uri.parse(url));
        startActivity(i);


    }
});
}

}

我认为我的问题在于代码的这一部分

Button devo = (Button) findViewById(R.id.button1);
devo.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v){
        String url = "http://www.google.com";
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setData(Uri.parse(url));
        startActivity(i);

但我不确定该放什么

String url = "what do i put here???";

将上一屏幕中点击的项目中的网址字符串

这是第一个将xml解析为listview

的屏幕

enter image description here

单击列表视图中的项目时会发生以下情况

enter image description here

log cat

01-13 15:14:31.818: E/AndroidRuntime(8665): FATAL EXCEPTION: main
01-13 15:14:31.818: E/AndroidRuntime(8665): java.lang.NullPointerException: uriString
01-13 15:14:31.818: E/AndroidRuntime(8665):     at android.net.Uri$StringUri.<init>(Uri.java:420)
01-13 15:14:31.818: E/AndroidRuntime(8665):     at android.net.Uri$StringUri.<init>(Uri.java:410)
01-13 15:14:31.818: E/AndroidRuntime(8665):     at  android.net.Uri.parse(Uri.java:382)
01-13 15:14:31.818: E/AndroidRuntime(8665):     at com.androidhive.xmlparsing.SingleMenuItemActivity$1.onClick(SingleMenuItemActivity.java:51)
01-13 15:14:31.818: E/AndroidRuntime(8665):     at android.view.View.performClick(View.java:2532)
01-13 15:14:31.818: E/AndroidRuntime(8665):     at android.view.View$PerformClick.run(View.java:9293)
01-13 15:14:31.818: E/AndroidRuntime(8665):     at android.os.Handler.handleCallback(Handler.java:587)
01-13 15:14:31.818: E/AndroidRuntime(8665):     at android.os.Handler.dispatchMessage(Handler.java:92)
01-13 15:14:31.818: E/AndroidRuntime(8665):     at android.os.Looper.loop(Looper.java:150)
01-13 15:14:31.818: E/AndroidRuntime(8665):     at android.app.ActivityThread.main(ActivityThread.java:4263)
01-13 15:14:31.818: E/AndroidRuntime(8665):     at java.lang.reflect.Method.invokeNative(Native Method)
01-13 15:14:31.818: E/AndroidRuntime(8665):     at java.lang.reflect.Method.invoke(Method.java:507)
01-13 15:14:31.818: E/AndroidRuntime(8665):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
01-13 15:14:31.818: E/AndroidRuntime(8665):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
01-13 15:14:31.818: E/AndroidRuntime(8665):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

您正在尝试将Uri对象传递给Bundle，String表示就足够了 EDIT 2p>

 lv.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, View view,
            int position, long id) {
        // getting values from selected ListItem
        String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
        String cost = ((TextView) view.findViewById(R.id.cost)).getText().toString();
        Uri uriUrl = Uri.parse(menuItems.get(position).get(KEY_GUID));

        // Starting new intent
        Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
        in.putExtra(KEY_NAME, name);
        in.putExtra(KEY_COST, cost);

        // **NEED TO PASS STRING OBJECT NOT URI OBJECT**
        in.putExtra(KEY_GUID, uriUrl.toString());
        startActivity(in);

    }
});

编辑：

public class SingleMenuItemActivity  extends Activity {

// XML node keys
static final String KEY_NAME = "title";
static final String KEY_COST = "description";
static final String KEY_DESC = "description";
static final String KEY_GUID = "guid";


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.single_list_item);

    // getting intent data
    final Intent in = getIntent();

    // Get XML values from previous intent
    String name = in.getStringExtra(KEY_NAME);
    String cost = in.getStringExtra(KEY_DESC);
    String description = in.getStringExtra(KEY_DESC);
    final String uriUrl = in.getStringExtra(KEY_GUID);

    // Displaying all values on the screen
    TextView lblName = (TextView) findViewById(R.id.name_label);
    TextView lblCost = (TextView) findViewById(R.id.cost_label);
    TextView lblDesc = (TextView) findViewById(R.id.description_label);


    lblName.setText(name);
    lblCost.setText(cost);
    lblDesc.setText(description);

Button devo = (Button) findViewById(R.id.button1);
devo.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v){
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setData(Uri.parse(uriUrl));
        startActivity(i);


    }
});
}

}

或

public class SingleMenuItemActivity extends Activity { // XML node keys static final String KEY_NAME = "title"; static final String KEY_COST = "description"; static final String KEY_DESC = "description"; static final String KEY_GUID = "guid"; private String url; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.single_list_item); // getting intent data final Intent in = getIntent(); // Get XML values from previous intent String name = in.getStringExtra(KEY_NAME); String cost = in.getStringExtra(KEY_DESC); String description = in.getStringExtra(KEY_DESC); url= in.getStringExtra(KEY_GUID); // Displaying all values on the screen TextView lblName = (TextView) findViewById(R.id.name_label); TextView lblCost = (TextView) findViewById(R.id.cost_label); TextView lblDesc = (TextView) findViewById(R.id.description_label); lblName.setText(name); lblCost.setText(cost); lblDesc.setText(description); Button devo = (Button) findViewById(R.id.button1); devo.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v){ Intent i = new Intent(Intent.ACTION_VIEW); i.setData(Uri.parse(url)); startActivity(i); } }); } }

如何使用Button点击从android中的xml feed打开url

1 个答案: