Question

好的，这是一个菜鸟问题。如何设置列表视图，点击时最好在新页面上显示描述。截至目前，应用程序仅打开并显示一个菜单，每次更改标题部分时，它都会更改页码。

package com.example.test;

import android.app.ActionBar;
import android.app.FragmentTransaction;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.NavUtils;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class MainActivity extends FragmentActivity implements ActionBar.OnNavigationListener {

private static final String STATE_SELECTED_NAVIGATION_ITEM = "selected_navigation_item";

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

    // Set up the action bar.
    final ActionBar actionBar = getActionBar();
    actionBar.setDisplayShowTitleEnabled(false);
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);

    // Set up the dropdown list navigation in the action bar.
    actionBar.setListNavigationCallbacks(
            // Specify a SpinnerAdapter to populate the dropdown list.
            new ArrayAdapter(
                    actionBar.getThemedContext(),
                    android.R.layout.simple_list_item_1,
                    android.R.id.text1,
                    new String[]{
                            getString(R.string.title_section1),
                            getString(R.string.title_section2),
                            getString(R.string.title_section3),
                            getString(R.string.title_section4),
                    }),
            this);
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
    if (savedInstanceState.containsKey(STATE_SELECTED_NAVIGATION_ITEM)) {
        getActionBar().setSelectedNavigationItem(
                savedInstanceState.getInt(STATE_SELECTED_NAVIGATION_ITEM));
    }
}

@Override
public void onSaveInstanceState(Bundle outState) {
    outState.putInt(STATE_SELECTED_NAVIGATION_ITEM,
            getActionBar().getSelectedNavigationIndex());
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}



@Override
public boolean onNavigationItemSelected(int position, long id) {
    // When the given tab is selected, show the tab contents in the container
    Fragment fragment = new DummySectionFragment();
    Bundle args = new Bundle();
    args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
    fragment.setArguments(args);
    getSupportFragmentManager().beginTransaction()
            .replace(R.id.container, fragment)
            .commit();
    return true;
}

/**
 * A dummy fragment representing a section of the app, but that simply displays dummy text.
 */
public static class DummySectionFragment extends Fragment {
    public DummySectionFragment() {
    }

    public static final String ARG_SECTION_NUMBER = "section_number";

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        TextView textView = new TextView(getActivity());
        textView.setGravity(Gravity.CENTER);
        Bundle args = getArguments();
        textView.setText(Integer.toString(args.getInt(ARG_SECTION_NUMBER)));
        return textView;
    }
}
}

Answer 1

由于您尚未实现任何功能，我建议您从默认的适配器实现开始。

检查this，它会对您有帮助。

修改

首先，您必须在{activity_main.xml *文件中添加ListView视图。

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

在此之后，您可以访问列表，这意味着您可以填写一些项目。

“找到您的View”

ListView list = (ListView) findViewById(R.id.myList)

定义要绑定的数据数组并设置适配器（我将使用示例中的相同数组）

final String[] values = new String[] { "Android", "iPhone", "WindowsMobile", "Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X", "Linux", "OS/2" }; // You have the necessary data to bind the list. final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, android.R.id.text1, values); // You have set the previous array to an adapter that can be now setted to a list. listView.setAdapter(adapter); //Set adapter and that's it.

嗯，这是一种开始了解如何填充列表视图的简单方法。如果您希望列表项具有多个单个文本，则必须构建自己的自定义适配器类。但这可能会受到另一个问题的影响：D

让我知道它是否有帮助！

如何设置listview？

1 个答案: