Android Java动态按钮点击

Question

我正在从我的JSON对象/数组中获得的数据生成按钮。从API获取。 目前我有20个循环可以这么说（20个数据，20个按钮）。

该按钮的XML /布局是这样的：

<Button 
     android:id="@+id/details" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content"/> 

目前的代码来获取数据，并在我的布局打印它看起来是这样的：

public class MainActivity extends AppCompatActivity 
     implements NavigationView.OnNavigationItemSelectedListener { 


    private String TAG = MainActivity.class.getSimpleName(); 

    private ProgressDialog pDialog; 
    private ListView lv; 

    // URL to get contacts JSON 
    private static String url = "http://192.168.178.32:8888/test/public/index"; 
     ArrayList<HashMap<String, String>> contactList; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     contactList = new ArrayList<>(); 

     new GetContacts().execute(); 
    lv = (ListView) findViewById(R.id.list); 

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
        .setAction("Action", null).show(); 
     } 
    }); 

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
      this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
    drawer.setDrawerListener(toggle); 
    toggle.syncState(); 

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); 
    navigationView.setNavigationItemSelectedListener(this); 
} 

    @Override 
    protected Void doInBackground(Void... arg0) { 
     HttpHandler sh = new HttpHandler(); 

     // Making a request to url and getting response 
     String jsonStr = sh.makeServiceCall(url); 

     Log.e(TAG, "Response from url: " + jsonStr); 

     if (jsonStr != null) { 
      try { 
       // Getting JSON Array node 
       JSONArray jsonArray = new JSONArray(jsonStr); 

       // looping through All Contacts 
       for (int i = 0; i < jsonArray.length(); i++) { 
        JSONObject c = jsonArray.getJSONObject(i); 

        String id = c.getString("id"); 
        String name = c.getString("name"); 
        String description = c.getString("description"); 

        // tmp hash map for single contact 
        HashMap<String, String> data = new HashMap<>(); 

        // adding each child node to HashMap key => value 
        data.put("id", id); 
        data.put("name", name); 
        data.put("description", description); 

        // adding contact to contact list 
        contactList.add(data); 
       } 
      } catch (final JSONException e) { 
       Log.e(TAG, "Json parsing error: " + e.getMessage()); 
       runOnUiThread(new Runnable() { 
        @Override 
        public void run() { 
         Toast.makeText(getApplicationContext(), 
           "Json parsing error: " + e.getMessage(), 
           Toast.LENGTH_LONG) 
           .show(); 
        } 
       }); 

      } 
     } else { 
      Log.e(TAG, "Couldn't get json from server."); 
      runOnUiThread(new Runnable() { 
       @Override 
       public void run() { 
        Toast.makeText(getApplicationContext(), 
          "Couldn't get json from server. Check LogCat for possible errors!", 
          Toast.LENGTH_LONG) 
          .show(); 
       } 
      }); 

     } 

     return null; 
    } 

    @Override 
    protected void onPostExecute(Void result) { 
     super.onPostExecute(result); 
     // Dismiss the progress dialog 
     if (pDialog.isShowing()) 
      pDialog.dismiss(); 
     /** 
     * Updating parsed JSON data into ListView 
     * */ 
     ListAdapter adapter = new SimpleAdapter(
       MainActivity.this, contactList, 
       R.layout.list_item, new String[]{"name", "description"}, new int[]{R.id.name, 
       R.id.description, R.id.release_at}); 

     lv.setAdapter(adapter); 
    } 

我的适配器看起来像这样：

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> { 

    private List<String> friends; 
    private Activity activity; 

    public RecyclerAdapter(Activity activity, List<String> friends, ArrayList<HashMap<String, String>> contactList) { 
     this.friends = friends; 
     this.activity = activity; 
    } 

    @Override 
    public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) { 

     //inflate your layout and pass it to view holder 
     LayoutInflater inflater = activity.getLayoutInflater(); 
     View view = inflater.inflate(android.R.layout.simple_list_item_1, viewGroup, false); 
     ViewHolder viewHolder = new ViewHolder(view); 

     return viewHolder; 
    } 

    @Override 
    public void onBindViewHolder(RecyclerAdapter.ViewHolder viewHolder, int position) { 

     viewHolder.item.setText(friends.get(position)); 
    } 

    @Override 
    public int getItemCount() { 
     return (null != friends ? friends.size() : 0); 
    } 

    /** 
    * View holder to display each RecylerView item 
    */ 
    protected class ViewHolder extends RecyclerView.ViewHolder { 
     private TextView item; 

     public ViewHolder(View view) { 
      super(view); 
      item = (TextView) view.findViewById(android.R.id.text1); 
     } 
    } 

} 

我的想法是点击每个按钮，并显示相关数据另一个更详细的活动。

但我怎样才能通过一个循环运行并获得正确的按钮（id）并创建一个新的活动与其相关的数据。

Answer 1

在您的适配器的getView方法中，您可以将onClickLister设置为该行中的按钮，该按钮将引用该行的数据。使用意图来启动详细的活动，并将点击的项目的数据作为额外添加。

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 

    //Inflate your row 

    button.setOnClickListener(new OnClickListener(){ 
     @Override 
     //On click function 
     public void onClick(View view) { 
      HashMap<String, String> item = contactsList.get(position); 
      //Create the intent to start another activity 
      Intent intent = new Intent(view.getContext(), DetailActivity.class); 
      intent.putExtra("data", item); 
      view.getContext().startActivity(intent); 
     } 
    }); 
}); 

在接收活动，您可以从意向获取数据：

HashMap<String, String> data = getIntent().getExtras().getParcelableExtra("data"); 

Answer 2

扩展ArrayAdapter并通过您在构造函数参数，将其联系人列表。将该列表分配给ArrayAdapter中的字段，然后在getView()方法中，您可以通过简单的list.get(position)获取您的物品。