Question

我正在尝试将 KEY_TITLE 的值从一个活动传递到另一个活动，使用点击列表项我点击的特定行标题，在我的情况下我试图传递此值：static final String KEY_TITLE =“title”;从 OldEventActivity 到 OldUploadActivity ，但我总是得到“索引位置如：0,1”，没有得到 KEY_TITLE的实际字符串 /强>

OldEventActivity.java：

final ArrayList<HashMap<String, String>> itemsList = new ArrayList<HashMap<String, String>>(); @Override protected ArrayList<HashMap<String, String>> doInBackground( String... params) { HttpClient client = new DefaultHttpClient(); // Perform a GET request for a JSON list HttpUriRequest request = new HttpGet(URL); // Get the response that sends back HttpResponse response = null; try { response = client.execute(request); } catch (ClientProtocolException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } // Convert this response into a readable string String jsonString = null; try { jsonString = StreamUtils.convertToString(response.getEntity() .getContent()); } catch (IllegalStateException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } // Create a JSON object that we can use from the String JSONObject json = null; try { json = new JSONObject(jsonString); } catch (JSONException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } try { JSONArray jsonArray = json.getJSONArray(KEY_CATEGORY); for (int i = 0; i < jsonArray.length(); i++) { HashMap<String, String> map = new HashMap<String, String>(); JSONObject jsonObject = jsonArray.getJSONObject(i); map.put("id", String.valueOf(i)); map.put(KEY_TITLE, jsonObject.getString(KEY_TITLE)); itemsList.add(map); } return itemsList; } catch (JSONException e) { Log.e("log_tag", "Error parsing data " + e.toString()); } return null; } @Override protected void onPostExecute(ArrayList<HashMap<String, String>> result) { list = (ListView) findViewById(R.id.listView1); adapter = new LazyAdapters(OldEventActivity.this, itemsList); list.setAdapter(adapter); // Show Item Title in Header this.progressDialog.dismiss(); list.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Intent mViewCartIntent = new Intent(OldEventActivity.this, OldUploadActivity.class); mViewCartIntent.putExtra("KEY", KEY_TITLE); startActivity(mViewCartIntent); } }); } } }

OldUploadActivity.java：

public class OldUploadActivity extends Activity { public static final String LOG_TAG = "OldUploadActivity"; private ListView lstView; private Handler handler = new Handler();; Bundle bundle; String keytitle; List <String> ImageList; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_uploads); bundle = getIntent().getExtras(); keytitle = bundle.getString("KEY"); /*** Get Images from SDCard ***/ ImageList = getSD(); Log.d(OldUploadActivity.LOG_TAG, "getSD() :::--- " + ImageList); // ListView and imageAdapter lstView = (ListView) findViewById(R.id.listView1); lstView.setAdapter(new ImageAdapter(this)); } private List <String> getSD() { List <String> it = new ArrayList <String>(); String string = "/mnt/sdcard/Pictures/PicsAngels/"; File f = new File (string + keytitle + "/"); Log.d(OldUploadActivity.LOG_TAG, "KEY_TITLE :::--- " + f); File[] files = f.listFiles (); Log.d(OldUploadActivity.LOG_TAG, "getListImages() :::--- " + files); for (int i = 0; i <files.length; i++) { File file = files[i]; Log.d(Upload.LOG_TAG, "i<files.length() :::--- " + i); Log.d("Count",file.getPath()); it.add (file.getPath()); } Log.d(Upload.LOG_TAG, "List <String> it :::--- " + it); return it; }

Answer 1

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
      HashMap<String, String> map = itemsList.get(position);
      Intent mViewCartIntent = new Intent(OldEventActivity.this, OldUploadActivity.class);
      mViewCartIntent.putExtra("KEY", map.get(KEY_TITLE));
      startActivity(mViewCartIntent);
     }
});

尝试上面的代码，看看你的OldUploadActivity.class不是空的。

Answer 2

请不要使用静态关键字更好地发送意图

public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) 
{       
       String KEY_TITLE= lv1.getItemAtPosition(position).toString();
       Intent mViewCartIntent = new Intent(OldEventActivity.this, OldUploadActivity.class);

       mViewCartIntent.putExtra("KEY", KEY_TITLE)
       startActivity(mViewCartIntent);
 }

并进入其他'

Bundle bundle=getIntent().getExtras();
String kettitle=bundle.getString("KEY")

Answer 3

问题在于这一行：

File f = new File (string + OldEventActivity.KEY_TITLE + "/");

您正在追加OldEventActivity.KEY_TITLE，您可以看到它是一个静态的最终字符串。

static final String KEY_TITLE = "title";

所以基本上，你的f正在查看路径/mnt/sdcard/Pictures/MyPics/title/，正如你的代码告诉它的那样。

看起来您正在尝试发送不同的值，而不是KEY_TITLE的值。而不是发送值（即“标题”），而是使用它作为KEY并发送实际值。即，而不是

Intent mViewCartIntent = new Intent(OldEventActivity.this, OldUploadActivity.class);
mViewCartIntent.putExtra("KEY", KEY_TITLE); 
startActivity(mViewCartIntent);

你应该写一些类似的东西：

Intent mViewCartIntent = new Intent(OldEventActivity.this, OldUploadActivity.class);
mViewCartIntent.putExtra(KEY_TITLE, "whatever title value you want to send here."); 
startActivity(mViewCartIntent);

然后在您想要获取价值的活动中，您只需通过

访问它

String passedTitle = intent.getStringExtra(OldEventActivity.KEY_TITLE);

获取ListView的索引位置单击项目不获取字符串值

3 个答案: