2

你好朋友我为导航抽屉示例实现了一个演示我的主要类文件如下：

import java.util.Locale;

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.SearchManager;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;

private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] mPlanetTitles;

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

    mTitle = mDrawerTitle = getTitle();
    mPlanetTitles = getResources().getStringArray(R.array.planets_array);
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mDrawerList = (ListView) findViewById(R.id.left_drawer);

    // set a custom shadow that overlays the main content when the drawer opens
    mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
    // set up the drawer's list view with items and click listener
    mDrawerList.setAdapter(new ArrayAdapter<String>(this,
            R.layout.drawer_list_item, mPlanetTitles));
    mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

    // enable ActionBar app icon to behave as action to toggle nav drawer
    getActionBar().setDisplayHomeAsUpEnabled(true);
    getActionBar().setHomeButtonEnabled(true);

    // ActionBarDrawerToggle ties together the the proper interactions
    // between the sliding drawer and the action bar app icon
    mDrawerToggle = new ActionBarDrawerToggle(
            this,                  /* host Activity */
            mDrawerLayout,         /* DrawerLayout object */
            R.drawable.ic_drawer,  /* nav drawer image to replace 'Up' caret */
            R.string.drawer_open,  /* "open drawer" description for accessibility */
            R.string.drawer_close  /* "close drawer" description for accessibility */
            ) {
        public void onDrawerClosed(View view) {
            getActionBar().setTitle(mTitle);
            invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
        }

        public void onDrawerOpened(View drawerView) {
            getActionBar().setTitle(mDrawerTitle);
            invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
        }
    };
    mDrawerLayout.setDrawerListener(mDrawerToggle);

    if (savedInstanceState == null) {
        selectItem(0);
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.main, menu);
    return super.onCreateOptionsMenu(menu);
}

/* Called whenever we call invalidateOptionsMenu() */
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    // If the nav drawer is open, hide action items related to the content view
    boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
    menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
    return super.onPrepareOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
     // The action bar home/up action should open or close the drawer.
     // ActionBarDrawerToggle will take care of this.
    if (mDrawerToggle.onOptionsItemSelected(item)) {
        return true;
    }
    // Handle action buttons
    switch(item.getItemId()) {
    case R.id.action_websearch:
        // create intent to perform web search for this planet
        Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
        intent.putExtra(SearchManager.QUERY, getActionBar().getTitle());
        // catch event that there's no activity to handle intent
        if (intent.resolveActivity(getPackageManager()) != null) {
            startActivity(intent);
        } else {
            Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show();
        }
        return true;
    default:
        return super.onOptionsItemSelected(item);
    }
}

/* The click listner for ListView in the navigation drawer */
private class DrawerItemClickListener implements ListView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        selectItem(position);
    }
}

private void selectItem(int position) {
    // update the main content by replacing fragments
    Fragment fragment = new PlanetFragment();
    Bundle args = new Bundle();
    args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
    fragment.setArguments(args);

    FragmentManager fragmentManager = getFragmentManager();
    fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();

    // update selected item and title, then close the drawer
    mDrawerList.setItemChecked(position, true);
    setTitle(mPlanetTitles[position]);
    mDrawerLayout.closeDrawer(mDrawerList);
}

@Override
public void setTitle(CharSequence title) {
    mTitle = title;
    getActionBar().setTitle(mTitle);
}

/**
 * When using the ActionBarDrawerToggle, you must call it during
 * onPostCreate() and onConfigurationChanged()...
 */

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    // Sync the toggle state after onRestoreInstanceState has occurred.
    mDrawerToggle.syncState();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    // Pass any configuration change to the drawer toggls
    mDrawerToggle.onConfigurationChanged(newConfig);
}

/**
 * Fragment that appears in the "content_frame", shows a planet
 */
public static class PlanetFragment extends Fragment {
    public static final String ARG_PLANET_NUMBER = "planet_number";

    public PlanetFragment() {
        // Empty constructor required for fragment subclasses
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_planet, container, false);
        int i = getArguments().getInt(ARG_PLANET_NUMBER);
        String planet = getResources().getStringArray(R.array.planets_array)[i];

        int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),
                        "drawable", getActivity().getPackageName());
        ((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);
        getActivity().setTitle(planet);
        return rootView;
      }
   }
}

我的清单文件如下：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.navigationdrawerexample"
android:versionCode="1"
android:versionName="1.0">

<uses-sdk android:minSdkVersion="4" android:targetSdkVersion="14" />
<uses-feature android:name="android.hardware.touchscreen" android:required="false"/>
<supports-screens
    android:anyDensity="true"
    android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:xlargeScreens="true" />

<application android:label="@string/app_name"
    android:icon="@drawable/ic_launcher"
    >
    <activity android:name=".MainActivity" android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>
</manifest>

此示例在 4.0 Android 设备中工作正常，但在 2.3 Android 设备中收到错误消息，例如

07-26 10:18:32.719: E/AndroidRuntime(1107): java.lang.NoSuchMethodError: com.example.android.navigationdrawerexample.MainActivity.getActionBar
07-26 10:18:32.719: E/AndroidRuntime(1107):     at com.example.android.navigationdrawerexample.MainActivity.onCreate(MainActivity.java:98)
07-26 10:18:32.719: E/AndroidRuntime(1107):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-26 10:18:32.719: E/AndroidRuntime(1107):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
07-26 10:18:32.719: E/AndroidRuntime(1107):     at   android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
07-26 10:18:32.719: E/AndroidRuntime(1107):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
07-26 10:18:32.719: E/AndroidRuntime(1107):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
07-26 10:18:32.719: E/AndroidRuntime(1107):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-26 10:18:32.719: E/AndroidRuntime(1107):     at android.os.Looper.loop(Looper.java:130)
07-26 10:18:32.719: E/AndroidRuntime(1107):     at android.app.ActivityThread.main(ActivityThread.java:3683)
07-26 10:18:32.719: E/AndroidRuntime(1107):     at java.lang.reflect.Method.invokeNative(Native Method)
07-26 10:18:32.719: E/AndroidRuntime(1107):     at java.lang.reflect.Method.invoke(Method.java:507)
07-26 10:18:32.719: E/AndroidRuntime(1107):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
07-26 10:18:32.719: E/AndroidRuntime(1107):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
07-26 10:18:32.719: E/AndroidRuntime(1107):     at dalvik.system.NativeStart.main(Native Method)
4

3 回答 3

10

来自 Android 文档：

ActionBar API 最初是在 Android 3.0（API 级别 11）中添加的，但它们也可以在支持库中使用，以便与 Android 2.1（API 级别 7）及更高版本兼容。

因此，如果您支持 API lvl 11 以下的设备，则应使用getSupportActionBar() 。

请按照文档中的 ActionBar 教程了解更多信息。

于 2013-07-26T10:50:22.767 回答
2

使用 getSupportActionBar() 而不是 getActionBar()。此外，当您使菜单无效时，请使用 supportInvalidateOptionsMenu() 而不是 invalidateOptionsMenu()。

于 2014-04-16T10:54:53.213 回答
0

在 HoneyComb 中引入的 ActionBar API，因此您不能为 API < 11 调用它们。

一种方法是ActionBarCompat。另一种选择是使用ActionBarSherlock。

于 2013-10-03T10:50:24.757 回答