Question

我的活动中有一个Edittext，用户只能输入字母。我想检查用户是否键入了其他字母以外的内容。我该怎么办？

我尝试过使用onKeyListener，但是我认为这是错误的方法，因为您必须为不是字母的其他所有键写很多“ else if”块。

package com.example.android.bakingapp;

    import android.support.annotation.Nullable;
   import android.support.v4.app.FragmentManager;

    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.support.v7.widget.Toolbar;
    import android.view.View;

    import com.example.android.bakingapp.Adapters.DetailsAdapter;
    import com.example.android.bakingapp.Models.Recipe;
    import com.example.android.bakingapp.Models.Steps;

    import java.util.ArrayList;
    import java.util.List;

    import static com.example.android.bakingapp.MainActivity.INDEX_RECIPE;
    import static com.example.android.bakingapp.MainActivity.SELECTED_INDEX;
    import static com.example.android.bakingapp.MainActivity.SELECTED_STEPS;

    public class RecipeDetailActivity extends AppCompatActivity implements DetailsAdapter.ListClickListener,
    StepsFragment.ListClickListener{

    private ArrayList<Recipe> recipeArrayList;
    String recipeName;

        static String STACK_RECIPE_DETAIL="stack_recipe_detail";
        static String STACK_RECIPE_STEP_DETAIL="STACK_RECIPE_STEP_DETAIL";
        public static String SHARED_PREFERENCE_KEY = "SHARED_PREFERENCE_KEY";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recipe_detail);
        if (savedInstanceState == null){
            Bundle indexRecipe = getIntent().getExtras();
            recipeArrayList = new ArrayList<>();
            assert indexRecipe != null;
            recipeArrayList = indexRecipe.getParcelableArrayList(INDEX_RECIPE);
            assert recipeArrayList != null;
            recipeName = recipeArrayList.get(0).getName();

            final DetailFragment detailFragment = new DetailFragment();
            detailFragment.setArguments(indexRecipe);
            FragmentManager fragmentManager = getSupportFragmentManager();
            fragmentManager.beginTransaction()
                    .replace(R.id.fragment_container, detailFragment)
                    .addToBackStack(STACK_RECIPE_DETAIL)
                    .commit();
            if(findViewById(R.id.recipe_linear_layout).getTag()!= null
                    && findViewById(R.id.recipe_linear_layout).getTag().equals("tablet-land")){
                final StepsFragment stepsFragment = new StepsFragment();
                stepsFragment.setArguments(indexRecipe);
                fragmentManager.beginTransaction()
                        .replace(R.id.fragment_container1,stepsFragment)
                        .addToBackStack(STACK_RECIPE_STEP_DETAIL)
                        .commit();
            }
        }else {
            recipeName = savedInstanceState.getString("Title");
        }

        Toolbar bakingToolbar = (Toolbar) findViewById(R.id.baking_toolbar);
        setSupportActionBar(bakingToolbar);
        getSupportActionBar().setHomeButtonEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setTitle(recipeName);

        bakingToolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentManager fragmentManager = getSupportFragmentManager();
                if(findViewById(R.id.fragment_container1)== null){
                    if (fragmentManager.getBackStackEntryCount() > 1){
                        fragmentManager.popBackStack(STACK_RECIPE_DETAIL, 0);
                }else if (fragmentManager.getBackStackEntryCount() > 0) {
                        //go back to "Recipe" screen
                        finish();

                }

            }
            else {finish();

                }
        }
    });
    }

    @Override
    public void onItemClick(List<Steps> stepsList, int clickedIndex, String recipeName) {

        final StepsFragment stepsFragment = new StepsFragment();
        FragmentManager fragmentManager = getSupportFragmentManager();

        getSupportActionBar().setTitle(recipeName);

        Bundle stepsBundle = new Bundle();
        stepsBundle.putParcelableArrayList(SELECTED_STEPS, (ArrayList<Steps>) stepsList);
        stepsBundle.putInt(SELECTED_INDEX, clickedIndex);
        stepsBundle.putString("Title", recipeName);
        stepsFragment.setArguments(stepsBundle);

        if (findViewById(R.id.recipe_linear_layout).getTag() != null
                && findViewById(R.id.recipe_linear_layout).getTag().equals("tablet-land")) {
            fragmentManager.beginTransaction()
                    .replace(R.id.fragment_container1, stepsFragment)
                    .addToBackStack(STACK_RECIPE_STEP_DETAIL)
                    .commit();
        } else {
            fragmentManager.beginTransaction()
                    .replace(R.id.fragment_container, stepsFragment).addToBackStack(STACK_RECIPE_STEP_DETAIL)
                    .commit();
        }
    }

    @Override
    protected void onSaveInstanceState(@Nullable Bundle savedInstanceState) {
        super.onSaveInstanceState(savedInstanceState);
        assert savedInstanceState != null;
        savedInstanceState.putString("Title",recipeName);
    }
}

例如，当用户单击空格时，我想向他显示一个警告对话框，提示您“您只能输入字母！”。或单击数字或单击斜杠。

Answer 1

尝试一下：

 editText.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                String src = (char)event.getUnicodeChar()+"";
                if(src.toString().matches("[a-zA-Z ]+")&&!src.equals(" ")||keyCode==KeyEvent.KEYCODE_DEL){
                    // do something here
                }
                else {
                    // alert dialog that says "you can type only letters!".
                }
                return false;
            }
        });

Android：如何检查用户是否单击了与edittext数字不同的键？

1 个答案: