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1つのアクティビティで解析したRSSフィードがあります。各アイテムには個別のURLが添付されています。リストビューでアイテムをクリックすると、解析中のxmlから定義した特定のテキストを表示する別のアクティビティが開きます。そのビューに、そのアイテムのxmlファイルからURLを割り当てたいボタンがあります。私が理解できない唯一のことは、そのボタンにURL情報を文字列化する方法です。これが私が使っているコードです。

xml解析アクティビティ

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);

        }
    });
}
 }

URLを表示するボタンがある2番目のアクティビティ

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);


    }
});
}

}

私の問題はコードのこの部分にあると思います

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);

でもここに何を入れたらいいのかわからない

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

前の画面でクリックしたアイテムのURLを文字列化するには

これは、xmlをリストビューに解析する最初の画面のように見えます

ここに画像の説明を入力してください

リストビューでアイテムをクリックすると、次のようになります。

ここに画像の説明を入力してください

ログ猫

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)
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1 に答える 1

1

Uri オブジェクトをバンドルに渡そうとしています。文字列表現で十分です。

EDIT2：

 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);

    }
});

編集：

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);


    }
});
}

}

また

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);


    }
});
}

}
于 2013-01-13T20:57:55.630 に答える