使用多个微调器过滤列表视图？

Question

此代码为listview，显示exercises[]字符串中的项目。您还可以使用EditText inputSearch和charsequence搜索这些项目，并通过比较字符串来检测选择的列表项目。

我需要的是： 一种使用多个微调器过滤listview（String exercise []）的方法吗？

完整代码：

public class CalExercises extends Activity {
    private ListView myListView;
    ArrayAdapter<String> myAdapter;
    EditText inputSearch;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_calexercise);
        String exercises[] = {"Wall Pushup", "Knees Pushup", "Regular Pushup", "Pullup"};
        myListView = (ListView) findViewById(R.id.exp_list);
        inputSearch = (EditText) findViewById(R.id.itemSearch);
        myAdapter = new ArrayAdapter<String>(this, R.layout.parent_layout, R.id.parent_txt, exercises);
        myListView.setAdapter(myAdapter);
        myListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {

                String PosItem = (String) arg0.getItemAtPosition(arg2);

                Intent itemIntent = new Intent(getBaseContext(), TempCalEx.class);
                String exIntent = "";

                if ("Wall Pushup".equals(PosItem))
                    exIntent = "wallpushup";
                else if ("Knees Pushup".equals(PosItem))
                    exIntent = "kneepushup";
                else if ("Regular Pushup".equals(PosItem)) {
                    exIntent = "regpushup";
                    Toast.makeText(CalExercises.this, "List Detect Test Success - Pushup", Toast.LENGTH_LONG).show();
                } else if ("Pullup".equals(PosItem)) {
                    exIntent = "pullup";
                    Toast.makeText(CalExercises.this, "List Detect Test Success - Pullup", Toast.LENGTH_LONG).show();
                }

                itemIntent.putExtra("exString", exIntent);
                startActivity(itemIntent);


                ;
                inputSearch.addTextChangedListener(new TextWatcher() {
                    @Override
                    public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
                        CalExercises.this.myAdapter.getFilter().filter(cs);
                    }

                    @Override
                    public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                                                  int arg3) {
                    }

                    @Override
                    public void afterTextChanged(Editable arg0) {
                    }
                });


            }

            ;

        });

    }}

Answer 1

首先，我建议使用此代码而不是复制粘贴;）

String PosItem = (String)arg0.getItemAtPosition(arg2);

Intent itemIntent = new Intent(getBaseContext(), TempCalEx.class);
String exIntent = "";

if ("Wall Pushup".equals(PosItem))
    exIntent = "wallpushup";
else if ("Knees Pushup".equals(PosItem))
    exIntent = "kneepushup";
else if ("Regular Pushup".equals(PosItem)) {
    exIntent = "regpushup";
    Toast.makeText(CalExercises.this, "List Detect Test Success - Pushup",Toast.LENGTH_LONG).show();
} else if ("Pullup".equals(PosItem)) {
    exIntent = "pullup";
    Toast.makeText(CalExercises.this, "List Detect Test Success - Pullup", Toast.LENGTH_LONG).show();
}

itemIntent.putExtra("exString", exIntent);
startActivity(itemIntent);

我没有在编辑器中对此进行测试，但它应该完全相同。它更容易阅读，并且由于使用了else，应该会略微提高性能。

另外，如果你想比较字符串，总是在你知道的对象上调用equals，永远不会为null。

关于你原来的问题：

  

显示将显示哪些子字符串的方法。

我不知道你想要展示的是什么。是否要过滤列表，或者只是在设置过滤器时对某些点击做出反应？你能详细说明吗？

修改

这应该有用。

// setting up the map, you might have to add more.
Map <String, String[]> map = new Map<String, String[]>();

map.put("normal",new String[]{"Wall Pushup", "Knees Pushup", "Regular Pushup","Pullup"}); 
map.put("beginner",new String[]{"Knees Pushup","Wall Pushup"});

// this would be the spinner that selects the "normal", "beginner" etc
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
        String[] content = map.get(spinner.getSelectedItem().toString());
        if (content = null)
            myListView.setAdapter(new ArrayAdapter<String>(this, R.layout.parent_layout, R.id.parent_txt, content));
    }

    @Override
    public void onNothingSelected(AdapterView<?> parentView) {
    }

});

但是你可能不得不向地图添加更多数组，因为我不知道所有可能发生的状态。

并使用正确的String作为键，如果你的微调器显示＆＃34;初学者＆＃34;你必须使用put（key，value）作为键的确切文本，否则它将始终为null。我建议使用自定义适配器，因为arrayadapter的选项有限，但这是一个不同的故事。

编辑2：

public class CalExercises extends Activity {
private ListView myListView;
ArrayAdapter<String> myAdapter;
EditText inputSearch;

List<String> exercises;

//TODO set those 2
Spinner spindif;
Spinner spinmus;

String[] array1;
String[] array2;

Map <String, String[]> map1 = new HashMap<String, String[]>();
Map <String, String[]> map2 = new HashMap<String, String[]>();

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_calexercise);

    exercises = new ArrayList<String>(Arrays.asList(new String[]{"Wall Pushup", "Knees Pushup", "Regular Pushup", "Pullup"}));

    myListView = (ListView) findViewById(R.id.exp_list);
    inputSearch = (EditText) findViewById(R.id.itemSearch);
    spindif = (Spinner) findViewById((R.id.filterDif)); 
    spinmus = (Spinner) findViewById((R.id.filterMus)); 

    myAdapter = new ArrayAdapter<String>(this, R.layout.parent_layout, R.id.parent_txt, exercises);
    myListView.setAdapter(myAdapter);
    myListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {

            String PosItem = (String) arg0.getItemAtPosition(arg2);

            Intent itemIntent = new Intent(getBaseContext(), TempCalEx.class);
            String exIntent = "";

            if ("Wall Pushup".equals(PosItem))
                exIntent = "wallpushup";
            else if ("Knees Pushup".equals(PosItem))
                exIntent = "kneepushup";
            else if ("Regular Pushup".equals(PosItem)) {
                exIntent = "regpushup";
                Toast.makeText(CalExercises.this, "List Detect Test Success - Pushup", Toast.LENGTH_LONG).show();
            } else if ("Pullup".equals(PosItem)) {
                exIntent = "pullup";
                Toast.makeText(CalExercises.this, "List Detect Test Success - Pullup", Toast.LENGTH_LONG).show();
            }

            itemIntent.putExtra("exString", exIntent);
            startActivity(itemIntent);

            inputSearch.addTextChangedListener(new TextWatcher() {
                @Override
                public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
                    CalExercises.this.myAdapter.getFilter().filter(cs);
                }

                @Override
                public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                                              int arg3) {
                }

                @Override
                public void afterTextChanged(Editable arg0) {
                }
            });


        }

        ;

    });

    // this would be the spinner that selects the "normal", "beginner" etc
    spindif.setOnItemSelectedListener(new OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
            array1 = map1.get(spinner1.getSelectedItem().toString());
            updateList();
        }

        @Override
        public void onNothingSelected(AdapterView<?> parentView) {
        }

    });

    spinmus.setOnItemSelectedListener(new OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
            array2 = map2.get(spinner2.getSelectedItem().toString());
            updateList();
        }

        @Override
        public void onNothingSelected(AdapterView<?> parentView) {
        }

    });
}

public void updateList() {
    List<Integer> aList =  Arrays.asList(array1);
    List<Integer> bList =  Arrays.asList(array2);
    aList.retainAll(bList);
    exercises = aList;
    myAdapter.notifyDataSetChanged();
}
}

所以这应该做到。