Question

我一直在寻找一个解决方案，但我找不到它。

现在我想要实现的是当我点击一个菜单选项时，我希望使用相同的菜单但使用不同的列表视图数据启动相同的活动。数据来自SQLITE。

我所做的是当我选择和选项（onoptionsitemselected）时，我传递一些参数来知道从数据库中检索哪些数据，但它只是工作第一个选项，其他选项不起作用。

这是我的活动代码，我认为我使用了错误的意图

public class PlantillaChina extends ActionBarActivity{

 // DB Class to perform DB related operations
DBController controller = new DBController(this);
// Progress Dialog Object
ProgressDialog prgDialog;
HashMap<String, String> queryValues;

@Override
protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.lista);
    Intent myIntent = getIntent();
    Intent myIntent2 = getIntent();
    Intent myIntent3 = getIntent();
    Intent myIntent4 = getIntent();

    String value = myIntent.getStringExtra("entremeses");
    String value2 = myIntent2.getStringExtra("arroces");
    String value3 = myIntent3.getStringExtra("mar");
    String value4 = myIntent4.getStringExtra("carnes");

 // Get plato records from SQLite DB

    ArrayList<HashMap<String, String>> platoList = new ArrayList<HashMap<String, String>>();
    if (value.equals("entremeses")){
        platoList = controller.getAllEntremeses();
    }else if(value2.equals("arroces")){
            platoList = controller.getAllArrocesyPasta();
        }else if(value3.equals("mar")){
                platoList = controller.getAllMar();
             }else if(value4.equals("carnes")){      
                        platoList = controller.getAllCarnes();
             }
    // If plato exists in SQLite DB
    if (platoList.size() != 0) {
        // Set the plato Array list in ListView
        ListAdapter adapter = new SimpleAdapter(PlantillaChina.this, platoList, R.layout.itemlista, new String[] {
                        "platoNombre", "platoDescripcion", "platoPrecio" }, new int[] { R.id.nombre, R.id.descripcion, R.id.precio });
        ListView myList = (ListView) findViewById(R.id.listaplatos);
        myList.setAdapter(adapter);
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.china, menu);
    return true;
}
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();
  //  if (id == R.id.action_settings) {
    //    return true;
    switch (item.getItemId()){
    case R.id.entremeses:
        Intent myIntent=new Intent(this,PlantillaChina.class);
        myIntent.putExtra("entremeses", "entremeses");
        this.startActivity(myIntent);
        break;
    case R.id.arrocesypasta:
        Intent myIntent2=new Intent(this,PlantillaChina.class);
        myIntent2.putExtra("arroces", "arroces");
        this.startActivity(myIntent2);
        break;
    case R.id.pescados:
        Intent myIntent3=new Intent(this,PlantillaChina.class);
        myIntent3.putExtra("mar", "mar");
        this.startActivity(myIntent3);
        break;
    case R.id.carnes:
        Intent myIntent4=new Intent(this,PlantillaChina.class);
        myIntent4.putExtra("carnes", "carnes");
        this.startActivity(myIntent4);
        break;

   } 


    return super.onOptionsItemSelected(item);
}

}

谢谢和亲切的问候

Answer 1

有些东西卡在我脑海里，我认为这是你问题的原因。 getStringExtra()和putExtra()方法使用键值对，而if-else语句具有奇怪的结构。为什么我们不尝试下面的？

public class PlantillaChina extends ActionBarActivity{

 // DB Class to perform DB related operations
DBController controller = new DBController(this);
// Progress Dialog Object
ProgressDialog prgDialog;
HashMap<String, String> queryValues;

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

    Intent myIntent = getIntent();
    String value = myIntent.getStringExtra("key");

 // Get plato records from SQLite DB

    ArrayList<HashMap<String, String>> platoList = new ArrayList<HashMap<String, String>>();
    if (value.equals("entremeses")){
        platoList = controller.getAllEntremeses();
    }else if(value.equals("arroces")){
            platoList = controller.getAllArrocesyPasta();
        }else if(value.equals("mar")){
                platoList = controller.getAllMar();
             }else if(value.equals("carnes")){      
                        platoList = controller.getAllCarnes();
             }
    // If plato exists in SQLite DB
    if (platoList.size() != 0) {
        // Set the plato Array list in ListView
        ListAdapter adapter = new SimpleAdapter(PlantillaChina.this, platoList, R.layout.itemlista, new String[] {
                        "platoNombre", "platoDescripcion", "platoPrecio" }, new int[] { R.id.nombre, R.id.descripcion, R.id.precio });
        ListView myList = (ListView) findViewById(R.id.listaplatos);
        myList.setAdapter(adapter);
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.china, menu);
    return true;
}
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();
  //  if (id == R.id.action_settings) {
    //    return true;
    switch (item.getItemId()){
    case R.id.entremeses:
        Intent myIntent=new Intent(this,PlantillaChina.class);
        myIntent.putExtra("key", "entremeses");
        this.startActivity(myIntent);
        break;
    case R.id.arrocesypasta:
        Intent myIntent2=new Intent(this,PlantillaChina.class);
        myIntent2.putExtra("key", "arroces");
        this.startActivity(myIntent2);
        break;
    case R.id.pescados:
        Intent myIntent3=new Intent(this,PlantillaChina.class);
        myIntent3.putExtra("key", "mar");
        this.startActivity(myIntent3);
        break;
    case R.id.carnes:
        Intent myIntent4=new Intent(this,PlantillaChina.class);
        myIntent4.putExtra("key", "carnes");
        this.startActivity(myIntent4);
        break;

   } 


    return super.onOptionsItemSelected(item);
}

同样的活动不同的listview

1 个答案: