如何在从 json 解析的列表视图上使用 onItemclick

Question

我有一个应用程序，它使用列表视图来显示从 JSON 接收的数据。现在，我希望在列表视图中有一个 onItemclick 侦听器，以便在显示列表视图后，用户可以单击任何行来启动新活动。但是 onclicklistener 不起作用。我是新开发人员，所以无法使其工作。请帮助我，以便我可以实现 onclick 侦听器。提前致谢。

已编辑：- 我面临的另一个问题是 switch case 似乎不起作用，因为我不知道行中将添加多少个 id，即行对我来说是未知的，它可能是任何东西。那么我应该使用什么来代替开关盒？

提前致谢

这是我的 StatementsActivity.java，它显示了列表视图

public class StatementsActivity extends AppCompatActivity {

    SharedPreferences myPrefs = PreferenceManager.getDefaultSharedPreferences(OpeningScreenActivity.getContextOfApplication());
    String token = myPrefs.getString("GCMTOKEN", "");
    String JSON_URL = "http://xyz.in/view_json.php?device_id=" + token;

    private ListView listView;



    private GoogleApiClient client;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_statements);


        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            R.layout.list_view_layout, ParseJSON.ids);
        listView = (ListView) findViewById(R.id.listView);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                                            @Override
                                            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                                                switch (position) {
                                                    case 0:
                                                        Intent newActivity = new Intent(StatementsActivity.this, MainActivity.class);
                                                        startActivity(newActivity);
                                                        break;
                                            }
                                        }
           @SuppressWarnings("unused")
           public void onClick(View v){
           }
        });
        sendRequest();

        client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}

 private void sendRequest() {
        StringRequest stringRequest = new StringRequest(JSON_URL,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    showJSON(response);
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Toast.makeText(StatementsActivity.this, error.getMessage(), Toast.LENGTH_LONG).show();
                }
            });
    RequestQueue requestQueue = Volley.newRequestQueue(this);
    requestQueue.add(stringRequest);
}



private void showJSON(String json) {
    ParseJSON pj = new ParseJSON(json);
    pj.parseJSON();
    CustomList cl = new CustomList(this, ParseJSON.ids,ParseJSON.mem_codes,ParseJSON.created_ons);
    listView.setAdapter(cl);
    }
}

这是我的 CustomList.java 类

public class CustomList extends ArrayAdapter<String> {
private String[] ids;
private String[] mem_codes;
private String[] created_ons;
private Activity context;



public CustomList(Activity context, String[] ids, String[] mem_codes, String[] created_ons) {
    super(context, R.layout.list_view_layout, ids);
    this.context = context;
    this.ids = ids;
    this.mem_codes = mem_codes;
    this.created_ons = created_ons;


}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater inflater = context.getLayoutInflater();
    View listViewItem = inflater.inflate(R.layout.list_view_layout, null, true);
    TextView textViewId = (TextView) listViewItem.findViewById(R.id.textViewId);
    TextView textViewMemCode = (TextView) listViewItem.findViewById(R.id.textViewMem_code);
    TextView textViewCreatedOn = (TextView) listViewItem.findViewById(R.id.textViewCreated_on);
    textViewId.setText(ids[position]);
    textViewMemCode.setText(mem_codes[position]);
    textViewCreatedOn.setText(created_ons[position]);
    return listViewItem;
   }
}

这是我的 ParseJSON.java 类

public class ParseJSON {
public static String[] ids;
public static String[] mem_codes;
public static String[] created_ons;

public static final String KEY_ID = "id";
public static final String KEY_MEM_CODE = "mem_code";
public static final String KEY_CREATED_ON = "created_on";
public static final String JSON_ARRAY = "result";

private JSONArray users = null;

private String json;

public ParseJSON(String json){
    this.json = json;
}

protected void parseJSON(){
    JSONObject jsonObject=null;
    try {
        jsonObject = new JSONObject(json);
        users = jsonObject.getJSONArray(JSON_ARRAY);

        ids = new String[users.length()];
        mem_codes = new String[users.length()];
        created_ons = new String[users.length()];

        for(int i=0;i<users.length();i++){
            JSONObject jo = users.getJSONObject(i);
            ids[i] = jo.getString(KEY_ID);
            mem_codes[i] = jo.getString(KEY_MEM_CODE);
            created_ons[i] = jo.getString(KEY_CREATED_ON);
        }
    } catch (JSONException e) {
        e.printStackTrace();
      }
   }
}

这是我的 activity_statements.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/buttonColor" tools:context=".StatementsActivity">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:layout_alignParentTop="true"
    android:layout_marginTop="50dp"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/listView1" />
</LinearLayout>


<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <include
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        layout="@layout/toolbar_layout"/>
</LinearLayout>


 </RelativeLayout>

这是我的 list_view_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/buttonColor">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="New Text"
    android:id="@+id/textViewId"
    android:layout_alignParentStart="true"/>
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="New Text"
    android:id="@+id/textViewMem_code"
    android:layout_centerHorizontal="true"/>
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="New Text"
    android:id="@+id/textViewCreated_on"
    android:layout_alignParentEnd="true"/>

</RelativeLayout>

Answer 1

我已经构建了一个以 Listview 样式显示的 android 应用程序，单击它们会显示它们各自的成本。

下面是它的代码。希望对你有帮助...

public class ListViewActivity extends AppCompatActivity {

   private static ListView lv;
   private static String[] prod_names = new String[] {"E", "G", "E2", "G2", "X"};
   private static int[] cost = new int[] {6500, 13000, 7500, 16000, 25000};


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

       Listener();
  }

public void Listener(){
    lv = (ListView)findViewById(R.id.listView);
    ArrayAdapter <String> adp = new ArrayAdapter<String>(this, R.layout.products_list, prod_names);
    lv.setAdapter(adp);
    lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            String val = (String)lv.getItemAtPosition(position);
            Toast.makeText(ListViewActivity.this, " Release# : "+ (position+1)+"\n Model : "+val+"\n Cost : Rs "+cost[position], Toast.LENGTH_LONG).show();

        }
    });
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_list_view, menu);
    return true;
}

   @Override
   public boolean onOptionsItemSelected(MenuItem item) {
       // Handle action bar item clicks here. The action bar will
       // automatically handle clicks on the Home/Up button, so long
       // as you specify a parent activity in AndroidManifest.xml.
       int id = item.getItemId();

       //noinspection SimplifiableIfStatement
       if (id == R.id.action_settings) {
           return true;
       }

       return super.onOptionsItemSelected(item);
   }
}

Answer 2

在您的onItemClick 中这样做：

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {


        Intent newActivity = new Intent(StatementsActivity.this, MainActivity.class);
        // Adding your variable to intent
        newActivity.putExtra("position",position);
        startActivity(newActivity);
        break;

    }

});

在您的 MainActivity.java 中：

public class MainActivity extends Activity
{
    int position;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        // Receiving your variable in another activity
        position = getIntent().getIntExtra("position",0);

    }
}

请参考：How do I pass data between Activities in Android application?

编辑：

看看这个

1. OnItemCLickListener not working in listview
2. ListView OnItemClickListener Not Responding?
3. OnItemClickListener and OnClickListener not working for ListView
4. ListView.onItemClick not working
5. Listview itemclick not work