Android(安卓)UI开发第三十三篇——Navigation Drawer For Android(安卓)API 7

Creating a Navigation Drawer中使用的Navigation Drawer的android:minSdkVersion="14"，现在Android API Version 小于14的还有30%左右呢。Android个版本的占有量可参考 Platform Version。

Android Platform Version

我们的应用为了适配不同的版本，需要降低minSdkVersion，作者一般适配SDK到API 7。这一篇博文也是把Creating a Navigation Drawer的例子适配到API 7 。例子中降低API最主要的修改Action Bar，Action Bar是API 11才出现的，适配到API 7，我们使用了actionbarsherlock.

修改后的代码：

public class MainActivity extends SherlockFragmentActivity {    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        getSupportActionBar().setDisplayHomeAsUpEnabled(true);        getSupportActionBar().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 */                ) {                /** Called when a drawer has settled in a completely closed state. */              public void onDrawerClosed(View view) {              getSupportActionBar().setTitle(mTitle);              }                /** Called when a drawer has settled in a completely open state. */              public void onDrawerOpened(View drawerView) {              getSupportActionBar().setTitle(mDrawerTitle);              }                     };        mDrawerLayout.setDrawerListener(mDrawerToggle);        if (savedInstanceState == null) {            selectItem(0);        }    }        @Override    public boolean onCreateOptionsMenu(Menu menu) {        MenuInflater inflater = getSupportMenuInflater();        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 android.R.id.home:         handleNavigationDrawerToggle();        return true;        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, getSupportActionBar().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);        }    }    private void handleNavigationDrawerToggle() {        if (mDrawerLayout.isDrawerOpen(mDrawerList)) {        mDrawerLayout.closeDrawer(mDrawerList);        } else {        mDrawerLayout.openDrawer(mDrawerList);        }      }    /* 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 = getSupportFragmentManager();        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;        getSupportActionBar().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;        }    }}

如果只修改JAVA代码，运行应用还是会出现异常：

08-13 13:26:15.909: E/AndroidRuntime(6832): FATAL EXCEPTION: main08-13 13:26:15.909: E/AndroidRuntime(6832): android.view.InflateException: Binary XML file line #2: Error inflating class <unknown>08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.LayoutInflater.createView(LayoutInflater.java:518)08-13 13:26:15.909: E/AndroidRuntime(6832):     at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:568)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.LayoutInflater.inflate(LayoutInflater.java:386)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.LayoutInflater.inflate(LayoutInflater.java:320)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:332)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.widget.AbsListView.obtainView(AbsListView.java:1495)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.widget.ListView.measureHeightOfChildren(ListView.java:1216)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.widget.ListView.onMeasure(ListView.java:1127)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.View.measure(View.java:8335)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.widget.RelativeLayout.measureChild(RelativeLayout.java:566)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:381)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.View.measure(View.java:8335)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.View.measure(View.java:8335)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:531)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.View.measure(View.java:8335)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.View.measure(View.java:8335)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.ViewRoot.performTraversals(ViewRoot.java:843)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1892)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.os.Handler.dispatchMessage(Handler.java:99)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.os.Looper.loop(Looper.java:130)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.app.ActivityThread.main(ActivityThread.java:3835)08-13 13:26:15.909: E/AndroidRuntime(6832):     at java.lang.reflect.Method.invokeNative(Native Method)08-13 13:26:15.909: E/AndroidRuntime(6832):     at java.lang.reflect.Method.invoke(Method.java:507)08-13 13:26:15.909: E/AndroidRuntime(6832):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864)08-13 13:26:15.909: E/AndroidRuntime(6832):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)08-13 13:26:15.909: E/AndroidRuntime(6832):     at dalvik.system.NativeStart.main(Native Method)08-13 13:26:15.909: E/AndroidRuntime(6832): Caused by: java.lang.reflect.InvocationTargetException08-13 13:26:15.909: E/AndroidRuntime(6832):     at java.lang.reflect.Constructor.constructNative(Native Method)08-13 13:26:15.909: E/AndroidRuntime(6832):     at java.lang.reflect.Constructor.newInstance(Constructor.java:415)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.LayoutInflater.createView(LayoutInflater.java:505)08-13 13:26:15.909: E/AndroidRuntime(6832):     ... 32 more08-13 13:26:15.909: E/AndroidRuntime(6832): Caused by: java.lang.UnsupportedOperationException: Can't convert to dimension: type=0x208-13 13:26:15.909: E/AndroidRuntime(6832):     at android.content.res.TypedArray.getDimensionPixelSize(TypedArray.java:463)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.view.View.<init>(View.java:1978)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.widget.TextView.<init>(TextView.java:350)08-13 13:26:15.909: E/AndroidRuntime(6832):     at android.widget.TextView.<init>(TextView.java:343)08-13 13:26:15.909: E/AndroidRuntime(6832):     ... 35 more

这个异常是 drawer_list_item.xml文件的内容产生的，drawer_list_item.xml内容：

<TextView xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@android:id/text1"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:textAppearance="?android:attr/textAppearanceListItemSmall"    android:gravity="center_vertical"    android:paddingLeft="16dp"    android:paddingRight="16dp"    android:textColor="#fff"    android:background="?android:attr/activatedBackgroundIndicator"    android:minHeight="?android:attr/listPreferredItemHeightSmall"/>

而在API 14之前的版本中，下面的三个属性会报异常：

<TextView xmlns:android="http://schemas.android.com/apk/res/android"      android:textAppearance="?android:attr/textAppearanceListItemSmall"      android:background="?android:attr/activatedBackgroundIndicator"      android:minHeight="?android:attr/listPreferredItemHeightSmall"/>

如果想适配更低的版本需要做如下的修改：

1）修改drawer_list_item.xml文件，使用自定义的属性

<?xml version="1.0" encoding="UTF-8"?><TextView xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@android:id/text1"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:background="?attr/myapp_activatedBackgroundIndicator"    android:gravity="center_vertical"    android:minHeight="?attr/myapp_listPreferredItemHeightSmall"    android:paddingLeft="16dp"    android:paddingRight="16dp"    android:textAppearance="?attr/myapp_textAppearanceListItemSmall" />

2）在 values/attrs.xml文件中声明自定义属性

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="AppTheme">    <!-- Attributes below are needed to support the navigation drawer on Android 3.x. -->    <!-- A smaller, sleeker list item height. -->    <attr name="myapp_listPreferredItemHeightSmall" format="dimension" />    <!-- Drawable used as a background for activated items. -->    <attr name="myapp_activatedBackgroundIndicator" format="reference" />    <!-- The preferred TextAppearance for the primary text of small list items. -->    <attr name="myapp_textAppearanceListItemSmall" format="reference" /></declare-styleable></resources>

3）在values-11/styles.xml文件中添加

  <!--        Base application theme, dependent on API level. This theme is replaced        by AppBaseTheme from res/values-vXX/styles.xml on newer devices.    -->    <style name="AppBaseTheme" parent="Theme.Sherlock.Light.DarkActionBar">        <!--            Theme customizations available in newer API levels can go in            res/values-vXX/styles.xml, while customizations related to            backward-compatibility can go here.        -->        <!-- Implementation of attributes needed for the navigation drawer as the default implementation is based on API-14. -->        <item name="myapp_listPreferredItemHeightSmall">48dip</item>        <item name="myapp_textAppearanceListItemSmall">@style/MyappDrawerMenu</item>        <item name="myapp_activatedBackgroundIndicator">@android:color/transparent</item>    </style>    <style name="MyappDrawerMenu">        <item name="android:textSize">16sp</item>        <item name="android:textStyle">bold</item>        <item name="android:textColor">@android:color/black</item>    </style>

4）在values-v14/styles.xml文件中添加

<!--        Base application theme for API 14+. This theme completely replaces        AppBaseTheme from BOTH res/values/styles.xml and        res/values-v11/styles.xml on API 14+ devices.    -->    <style name="AppBaseTheme" parent="android:Theme.Holo.Light.DarkActionBar">         <!-- For API-14 and above the default implementation of the navigation drawer menu is used. Below APU-14 a custom implementation is used. -->           <item name="myapp_listPreferredItemHeightSmall">?android:attr/listPreferredItemHeightSmall</item>           <item name="myapp_textAppearanceListItemSmall">?android:attr/textAppearanceListItemSmall</item>           <item name="myapp_activatedBackgroundIndicator">?android:attr/activatedBackgroundIndicator</item>       </style>

OK，经过上面步骤，运行成功，这样上一篇的例子就能很好的适配到API 7了。

/** * @author 张兴业 * http://blog.csdn.net/xyz_lmn * iOS入门群：83702688
* android开发进阶群：241395671 * 我的新浪微博：@张兴业TBOW */

代码下载：Demo

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