我目前正在为我的网站http://loadedgeek.com构建一个 Android 应用程序- 如果您访问它，它是一个论坛，所以我希望该应用程序允许用户创建/发布主题、阅读主题以及在通过应用程序访问网站，而无需应用程序打开浏览器。
现在我希望用户在单击“查看主题”时通过其数据库在网站上显示主题，因此 MainActivity 调用 AllTopicsActivity。这是我遇到问题的地方，我仍然是一个学习者，所以我在谷歌搜索并将代码组合在一起，该活动让用户编辑主题而不仅仅是阅读主题。
这是 main.xml 文件
<!-- Sample Dashboard screen with four buttons --> <!-- Button to view all topics screen --> <Button android:id="@+id/btnViewTopics" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="View Topics" android:layout_marginTop="25dip"/> <!-- Button to create a new topic screen --> <Button android:id="@+id/btnCreateTopics" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Add New Topic" android:layout_marginTop="25dip"/> <!-- Button to create a loadedgeek account --> <Button android:id="@+id/btnCreateAccount" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Create An Account" android:layout_marginTop="25dip"/> <!-- Button To Check For Updates --> <Button android:id="@+id/btnCheckForUpdate" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Check For Application Update" android:layout_marginTop="25dip"/> <!-- Button To View Application Information --> <Button android:id="@+id/btnViewAppDetails" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="About The Application" android:layout_marginTop="25dip"/> </LinearLayout>
这是当用户单击查看主题按钮时调用 AllTopicsActivity 的 MainActivity
包 com.loadedgeek.app；导入android.app.Activity；导入android.content.Intent；导入android.os.Bundle；导入android.view.View；导入android.widget.Button；公共类 MainActivity 扩展 Activity{
Button btnViewTopics; Button btnNewTopic; Button btnCreateAccount; Button btnCheckForUpdates; Button btnViewAppDetails @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // Buttons btnViewTopics = (Button) findViewById(R.id.btnViewTopics); btnNewTopic = (Button) findViewById(R.id.btnCreateTopic); btnCreateAccount = (Button) findViewById(R.id.btnCreateAccount); btnCheckForUpdates = (Button) findViewById(R.id.btnCheckForUpdates); btnViewAppDetails = (Button) findViewById(R.id.btnViewAppDetails); // view topics click event btnViewTopics.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // Launching All topics Activity Intent i = new Intent(getApplicationContext(), AllTopicsActivity.class); startActivity(i); } }); // new topic click event btnNewTopic.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // Launching create new topic activity Intent i = new Intent(getApplicationContext(), NewTopicActivity.class); startActivity(i); } }); // create account click event btnCreateAccount.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // Launching All topics Activity Intent i = new Intent(getApplicationContext(), CreateAccount.class); startActivity(i); } }); // check for updates click event btnCheckForUpdates.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // Launching All topics Activity Intent i = new Intent(getApplicationContext(), CheckUpdates.class); startActivity(i); } }); // view app click event btnViewAppDetails.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // Launching All topics Activity Intent i = new Intent(getApplicationContext(), AppDetails.class); startActivity(i); } }); } }
现在这是我遇到问题的 AllTopicActivity
包 com.loadedgeek.official; 导入 java.util.ArrayList；导入 java.util.HashMap；导入 java.util.List；导入 org.apache.http.NameValuePair；导入 org.json.JSONArray；导入 org.json.JSONException；导入 org.json.JSONObject；导入android.app.ListActivity；导入 android.app.ProgressDialog；导入android.content.Intent；导入android.os.AsyncTask；导入android.os.Bundle；导入android.util.Log；导入android.view.View；导入 android.widget.AdapterView；导入 android.widget.AdapterView.OnItemClickListener；导入 android.widget.ListAdapter；导入 android.widget.ListView；导入 android.widget.SimpleAdapter；导入 android.widget.TextView；公共类 AllTopicsActivity 扩展 ListActivity {
// Progress Dialog private ProgressDialog pDialog; // Creating JSON Parser object JSONParser jParser = new JSONParser(); ArrayList<HashMap<String, String>> topicsList; // url to get all products list private static String url_all_topics = "http://api.loadedgeek.com/android_connect/get_all_topics.php"; // JSON Node names private static final String TAG_SUCCESS = "success"; private static final String TAG_TOPIC = "topic"; private static final String TAG_ID = "id"; private static final String TAG_SUBJECT = "subject"; // products JSONArray JSONArray products = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.topics); // Hashmap for ListView topicsList = new ArrayList<HashMap<String, String>>(); // Loading products in Background Thread new LoadAllTopics().execute(); // Get listview ListView lv = getListView(); // on seleting single product // launching Edit topic lv.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // getting values from selected ListItem String id = ((TextView) view.findViewById(R.id.id)).getText() .toString(); // Starting new intent Intent in = new Intent(getApplicationContext(), EditTopicActivity.class); // sending pid to next activity in.putExtra(TAG_ID, id); // starting new activity and expecting some response back startActivityForResult(in, 100); } }); }
当用户单击主题时，您会看到它会启动 EditTopicActivity，而不是要阅读的文本视图:(
它在列表视图中显示主题，但是当用户单击任何主题时，它将显示并让用户编辑我不想要的主题，我尝试删除编辑代码但它分散了整个项目，所以现在我需要帮助，我希望活动在文本视图中显示主题及其详细信息，而不让用户编辑或删除它。谢谢
这是 EditTopicActivity，它包含删除和更新我想要避免和删除的主题的活动。它还显示 edit_topic.xml 文件。下面的活动
公共类 EditTopicActivity 扩展活动 {
EditText txtSubject; EditText txtPoster; EditText txtMessage; EditText txtCreatedAt; Button btnSave; Button btnDelete; String pid; // Progress Dialog private ProgressDialog pDialog; // JSON parser class JSONParser jsonParser = new JSONParser(); // single product url private static final String url_topic_detials = "http://api.loadedgeek.com/android_connect/get_topic_details.php"; // url to update product private static final String url_update_topic = "http://api.loadedgeek.com/android_connect/update_topic.php"; // url to delete product private static final String url_delete_topic = "http://api.loadedgeek.com/android_connect/delete_topic.php"; // JSON Node names private static final String TAG_SUCCESS = "success"; private static final String TAG_TOPIC = "topic"; private static final String TAG_ID = "id"; private static final String TAG_SUBJECT = "subject"; private static final String TAG_POSTER = "poster"; private static final String TAG_MESSAGE = "message"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.edit_topic); // save button btnSave = (Button) findViewById(R.id.btnSave); btnDelete = (Button) findViewById(R.id.btnDelete); // getting product details from intent Intent i = getIntent(); // getting product id (pid) from intent pid = i.getStringExtra(TAG_ID); // Getting complete product details in background thread new GetProductDetails().execute(); // save button click event btnSave.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { // starting background task to update product new SaveTopicDetails().execute(); } }); // Delete button click event btnDelete.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { // deleting product in background thread new DeleteTopic().execute(); } }); } /** * Background Async Task to Get complete product details * */ class GetProductDetails extends AsyncTask<String, String, String> { /** * Before starting background thread Show Progress Dialog * */ @Override protected void onPreExecute() { super.onPreExecute(); pDialog = new ProgressDialog(EditTopicActivity.this); pDialog.setMessage("Loading Topic details. Please wait..."); pDialog.setIndeterminate(false); pDialog.setCancelable(true); pDialog.show(); } /** * Getting product details in background thread * */ protected String doInBackground(String... params) { // updating UI from Background Thread runOnUiThread(new Runnable() { public void run() { // Check for success tag int success; try { // Building Parameters List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("pid", pid)); // getting product details by making HTTP request // Note that product details url will use GET request JSONObject json = jsonParser.makeHttpRequest( url_topic_detials, "GET", params); // check your log for json response Log.d("Single Topic Details", json.toString()); // json success tag success = json.getInt(TAG_SUCCESS); if (success == 1) { // successfully received product details JSONArray topicsObj = json .getJSONArray(TAG_TOPICS); // JSON Array // get first product object from JSON Array JSONObject topics = topicsObj.getJSONObject(0); // product with this pid found // Edit Text txtSubject = (EditText) findViewById(R.id.inputSubject); txtPoster = (EditText) findViewById(R.id.inputPoster); txtMessage = (EditText) findViewById(R.id.inputMessage); // display product data in EditText txtSubject.setText(topics.getString(TAG_SUBJECT)); txtPoster.setText(topics.getString(TAG_POSTER)); txtMessage.setText(topics.getString(TAG_MESSAGE)); }else{ // product with pid not found } } catch (JSONException e) { e.printStackTrace(); } } }); return null; } /** * After completing background task Dismiss the progress dialog * **/ protected void onPostExecute(String file_url) { // dismiss the dialog once got all details pDialog.dismiss(); } } /** * Background Async Task to Save product Details * */ class SaveTopicDetails extends AsyncTask<String, String, String> { /** * Before starting background thread Show Progress Dialog * */ @Override protected void onPreExecute() { super.onPreExecute(); pDialog = new ProgressDialog(EditTopicActivity.this); pDialog.setMessage("Saving Topic ..."); pDialog.setIndeterminate(false); pDialog.setCancelable(true); pDialog.show(); } /** * Saving product * */ protected String doInBackground(String... args) { // getting updated data from EditTexts String name = txtName.getText().toString(); String price = txtPrice.getText().toString(); String description = txtDesc.getText().toString(); // Building Parameters List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair(TAG_PID, pid)); params.add(new BasicNameValuePair(TAG_NAME, name)); params.add(new BasicNameValuePair(TAG_PRICE, price)); params.add(new BasicNameValuePair(TAG_DESCRIPTION, description)); // sending modified data through http request // Notice that update product url accepts POST method JSONObject json = jsonParser.makeHttpRequest(url_update_product, "POST", params); // check json success tag try { int success = json.getInt(TAG_SUCCESS); if (success == 1) { // successfully updated Intent i = getIntent(); // send result code 100 to notify about product update setResult(100, i); finish(); } else { // failed to update product } } catch (JSONException e) { e.printStackTrace(); } return null; } /** * After completing background task Dismiss the progress dialog * **/ protected void onPostExecute(String file_url) { // dismiss the dialog once product uupdated pDialog.dismiss(); } } /***************************************************************** * Background Async Task to Delete Product * */ class DeleteProduct extends AsyncTask<String, String, String> { /** * Before starting background thread Show Progress Dialog * */ @Override protected void onPreExecute() { super.onPreExecute(); pDialog = new ProgressDialog(EditTopicActivity.this); pDialog.setMessage("Deleting Topic..."); pDialog.setIndeterminate(false); pDialog.setCancelable(true); pDialog.show(); } /** * Deleting product * */ protected String doInBackground(String... args) { // Check for success tag int success; try { // Building Parameters List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("id", id)); // getting product details by making HTTP request JSONObject json = jsonParser.makeHttpRequest( url_delete_product, "POST", params); // check your log for json response Log.d("Delete Topic", json.toString()); // json success tag success = json.getInt(TAG_SUCCESS); if (success == 1) { // product successfully deleted // notify previous activity by sending code 100 Intent i = getIntent(); // send result code 100 to notify about product deletion setResult(100, i); finish(); } } catch (JSONException e) { e.printStackTrace(); } return null; } /** * After completing background task Dismiss the progress dialog * **/ protected void onPostExecute(String file_url) { // dismiss the dialog once product deleted pDialog.dismiss(); } } }
唉，edit_topic 文件
<!-- Input Name --> <EditText android:id="@+id/inputSubject" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_margin="5dip" android:layout_marginBottom="15dip" android:singleLine="true"/> <!-- Price Label --> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Your Name" android:paddingLeft="10dip" android:paddingRight="10dip" android:paddingTop="10dip" android:textSize="17dip"/> <!-- Input poster name --> <EditText android:id="@+id/inputPoster" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_margin="5dip" android:layout_marginBottom="15dip" android:singleLine="true"/> <!-- Description Label --> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Topic Message" android:paddingLeft="10dip" android:paddingRight="10dip" android:paddingTop="10dip" android:textSize="17dip"/> <!-- Input description --> <EditText android:id="@+id/inputMessage" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_margin="5dip" android:layout_marginBottom="15dip" android:lines="4" android:gravity="top"/> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <!-- Button Csave topic --> <Button android:id="@+id/btnSave" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Save Changes" android:layout_weight="1"/> <!-- Button Create topic --> <Button android:id="@+id/btnDelete" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Delete" android:layout_weight="1"/> </LinearLayout> </LinearLayout>