我为我的抽屉创建了一个 BaseActivity，但它总是在启动时崩溃。我不知道为什么它总是崩溃。有人知道该怎么做或如何配置 BaseActivity 吗？
它总是在 onCreate 和我配置抽屉时崩溃。有任何想法吗？
BaseActivity 的代码：
public abstract class BaseActivity extends ActionBarActivity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
public Context context;
@Override
public void onCreate(Bundle SavedInstanceState) {
super.onCreate(SavedInstanceState);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
String[] menu = getResources().getStringArray(R.array.menu);
mDrawerList.setAdapter(new ArrayAdapter<String>(this, R.layout.drawer_list_item, menu));
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(
this, /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_navigation_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) {
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
public void onDrawerOpened(View drawerView) {
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
@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;
}
return true;
}
/* 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) {
switch (position) {
case 0:
Intent all = new Intent(context, All.class);
startActivity(all);
break;
case 1:
Intent country = new Intent(context, ByCountry.class);
startActivity(country);
break;
case 2:
Intent device = new Intent(context, ByDevice.class);
startActivity(device);
break;
case 3:
Intent about = new Intent(context, About.class);
startActivity(about);
break;
case 4:
Intent info = new Intent(context, Info.class);
startActivity(info);
break;
case 5:
Intent settings = new Intent(context, Settings.class);
startActivity(settings);
break;
}
} };
@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);
}
}