如何使用自定义ListView适配器切换活动?

时间:2018-02-05 17:03:40

标签: android listview custom-adapter

我正在尝试使用自定义ListView适配器切换到不同的活动,但我遇到了麻烦,因为有一个我似乎无法摆脱的错误。

相关代码 分类表:

public class CategoryTable extends AppCompatActivity {

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

    populateTable();

    goToPreviousActivity();
}

private void populateTable() {

    final ListView mListView = findViewById(R.id.listView);

    Category 1 = new Category("  One");
    Category 2 = new Category("  Two");
    Category 3 = new Category("  Three");
    Category 4 = new Category("  Four");

    final ArrayList<Category> categoryList = new ArrayList<>();
    categoryList.add(1);
    categoryList.add(2);
    categoryList.add(3);
    categoryList.add(4);

    CategoryListAdapter adapter = new CategoryListAdapter(this, R.layout.adapter_view_layout, categoryList);
    mListView.setAdapter(adapter);

}

private void goToPreviousActivity() {
    ImageButton btn = findViewById(R.id.backButton);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            finish();
        }
    });
}

public static Intent makeIntent(Context context) {
    return new Intent(context, CategoryTable.class);
}
}

类别列表适配器:

public class CategoryListAdapter extends ArrayAdapter<Category> {

private Context mContext;
int mResource;

public CategoryListAdapter(Context context, int resource, ArrayList<Category> objects) {
    super(context, resource, objects);
    mContext = context;
    mResource = resource;
}

@NonNull
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    String name = getItem(position).getName();

    Category category = new Category(name);

    final LayoutInflater inflater = LayoutInflater.from(mContext);
    convertView = inflater.inflate(mResource, parent, false);

    Button catName = convertView.findViewById(R.id.btnNextTbl);

    catName.setText(name);
    catName.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            if (position == 0) {

                //error -> makeIntent(android.content.Context in AllToolsTable cannot be applied to com.test.test.CategoryListAdapter
                Intent intent = AllToolsTable.makeIntent(CategoryListAdapter.this);
                mContext.startActivity(intent);

            } else {
                Toast toast = Toast.makeText(getContext(), "Clicked2", Toast.LENGTH_SHORT);
                toast.show();
            }
        }
    });

    return convertView;
}

}

(我在错误的代码段上面评论过)

所有工具表:

public class AllToolsTable extends AppCompatActivity {

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

public static Intent makeIntent(Context context) {
    return new Intent(context, AllToolsTable.class);
}
}

如果需要,我会提供任何其他相关的代码/细节。

非常感谢任何帮助。

1 个答案:

答案 0 :(得分:1)

propertyToUnwind

您的includeArrayIndex方法需要//error -> makeIntent(android.content.Context in AllToolsTable cannot be applied to com.test.test.CategoryListAdapter Intent intent = AllToolsTable.makeIntent(CategoryListAdapter.this); 个参数。通常情况下,您可以使用AllToolsTable.makeIntent()之类的内容,因为ContextAllToolsTable.makeIntent(MainActivity.this)的子类。但是,Activity不是。

所以你需要以某种方式接触Context对象。

幸运的是,CategoryListAdapter方法会传递一个非null Context对象,并且所有视图都有一个上下文。因此,您可以使用以下代码替换您的意图创建:

getView()