Android 从NavigationDrawer启动活动
我从零开始重写我的应用程序,因为我希望它更加现代和直观。为此,我使用了带有片段的NavigationDrawer布局 现在,我希望用户单击NavigationDrawer的一个选项可以启动另一个活动(而不是片段),这是一个墙纸选择器 我的代码可以工作,但当用户这样做时,MainActivity崩溃。为什么? 以下是主要活动:Android 从NavigationDrawer启动活动,android,android-fragments,android-activity,fragment,gallery,Android,Android Fragments,Android Activity,Fragment,Gallery,我从零开始重写我的应用程序,因为我希望它更加现代和直观。为此,我使用了带有片段的NavigationDrawer布局 现在,我希望用户单击NavigationDrawer的一个选项可以启动另一个活动(而不是片段),这是一个墙纸选择器 我的代码可以工作,但当用户这样做时,MainActivity崩溃。为什么? 以下是主要活动: public class MainActivity extends Activity { private DrawerLayout mDrawerLayout;
public class MainActivity extends Activity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
CustomDrawerAdapter adapter;
List<DrawerItem> dataList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initializing
dataList = new ArrayList<DrawerItem>();
mTitle = mDrawerTitle = getTitle();
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow,
GravityCompat.START);
// Add Drawer Item to dataList
dataList.add(new DrawerItem("Launchers", R.drawable.ic_action_email));
dataList.add(new DrawerItem("Extras", R.drawable.ic_action_good));
dataList.add(new DrawerItem("Support", R.drawable.ic_action_gamepad));
dataList.add(new DrawerItem("Contact", R.drawable.ic_action_labels));
dataList.add(new DrawerItem("Wallpapers", R.drawable.ic_action_search));
dataList.add(new DrawerItem("Import & Export",
R.drawable.ic_action_import_export));
dataList.add(new DrawerItem("About", R.drawable.ic_action_about));
dataList.add(new DrawerItem("Settings", R.drawable.ic_action_settings));
dataList.add(new DrawerItem("Help", R.drawable.ic_action_help));
adapter = new CustomDrawerAdapter(this, R.layout.custom_drawer_item,
dataList);
mDrawerList.setAdapter(adapter);
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, R.string.drawer_open,
R.string.drawer_close) {
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) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void goToWallpaper (View view) {
Intent intent = new Intent(this, Wallpaper.class);
startActivity(intent);
}
public void SelectItem(int position) {
Fragment fragment = null;
Bundle args = new Bundle();
switch (position) {
case 0:
fragment = new FragmentOne();
break;
case 1:
fragment = new FragmentTwo();
break;
case 2:
fragment = new FragmentThree();
break;
case 3:
fragment = new FragmentFour();
break;
case 4:
startActivity(new Intent(this, Wallpaper.class));
break;
default:
break;
}
fragment.setArguments(args);
FragmentManager frgManager = getFragmentManager();
frgManager.beginTransaction().replace(R.id.content_frame, fragment)
.commit();
mDrawerList.setItemChecked(position, true);
setTitle(dataList.get(position).getItemName());
mDrawerLayout.closeDrawer(mDrawerList);
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
@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 toggles
mDrawerToggle.onConfigurationChanged(newConfig);
}
@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 false;
}
private class DrawerItemClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
SelectItem(position);
}
}
公共类MainActivity扩展活动{
私人抽屉布局mDrawerLayout;
私有列表视图mDrawerList;
私有操作bardrawertoggle mDrawerToggle;
私有字符序列mDrawerTitle;
私有字符序列mTitle;
雷达适配器;
列表数据列表;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化
dataList=newarraylist();
mTitle=mDrawerTitle=getTitle();
mDrawerLayout=(抽屉布局)findViewById(R.id.抽屉布局);
mDrawerList=(ListView)findViewById(R.id.left\u抽屉);
mDrawerLayout.setDrawerShadow(R.drawable.DrawerShadow,
重力比较(启动);
//将抽屉项添加到数据列表
添加(新的DrawerItem(“启动器”,R.drawable.ic_action_email));
添加(新的付款人(“额外的”,R.drawable.ic_action_good));
添加(新的DrawerItem(“Support”,R.drawable.ic_action_gamepad));
添加(新的付款人标签(“联系人”,R.drawable.ic_action_标签));
添加(新抽屉(“墙纸”,R.drawable.ic_action_search));
添加(新的“导入和导出”,
R.drawable.ic_action_import_export));
添加(新的DrawerItem(“About”,R.drawable.ic_action_About));
添加(新的抽屉属性(“设置”,R.drawable.ic_action_设置));
添加(新的DrawerItem(“Help”,R.drawable.ic_action_Help));
适配器=新的CustomDrawerRadepter(此,R.layout.custom_抽屉项目,
数据表);
mDrawerList.setAdapter(适配器);
setOnItemClickListener(新的DrawerItemClickListener());
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle=新操作BarDrawerToggle(此,mDrawerLayout,
R.drawable.ic_抽屉,R.string.drawer_抽屉打开,
右弦抽屉(U关闭){
公共无效onDrawerClosed(视图){
getActionBar().setTitle(mTitle);
InvalidateOptions菜单();//创建对的调用
//onPrepareOptions菜单()
}
打开图纸上的公共空白(视图抽屉视图){
getActionBar().setTitle(mDrawerTitle);
InvalidateOptions菜单();//创建对的调用
//onPrepareOptions菜单()
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
如果(savedInstanceState==null){
选择项目(0);
}
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(R.menu.main,menu);
返回true;
}
公共作废goToWallpaper(视图){
意向意向=新意向(此,Wallpaper.class);
星触觉(意向);
}
public void SelectItem(内部位置){
片段=空;
Bundle args=新Bundle();
开关(位置){
案例0:
fragment=新的FragmentOne();
打破
案例1:
fragment=新的FragmentTwo();
打破
案例2:
fragment=新的FragmentThree();
打破
案例3:
fragment=新的FragmentFour();
打破
案例4:
startActivity(新意图(此,Wallpaper.class));
打破
违约:
打破
}
fragment.setArguments(args);
FragmentManager frgManager=getFragmentManager();
frgManager.beginTransaction().replace(R.id.content\u框架,片段)
.commit();
mDrawerList.setItemChecked(位置,true);
setTitle(dataList.get(position.getItemName());
mDrawerLayout.closeDrawer(mDrawerList);
}
@凌驾
公共无效设置标题(字符序列标题){
mTitle=标题;
getActionBar().setTitle(mTitle);
}
@凌驾
后期创建时受保护的空(捆绑包savedInstanceState){
super.onPostCreate(savedInstanceState);
//在onRestoreInstanceState发生后同步切换状态。
mDrawerToggle.syncState();
}
@凌驾
公共无效OnConfiguration已更改(配置newConfig){
super.onConfigurationChanged(newConfig);
//将任何配置更改传递给抽屉开关
mDrawerToggle.onConfigurationChanged(newConfig);
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
//操作栏home/up操作应打开或关闭抽屉。
//ActionBarDrawerToggle会处理好的。
如果(MDRAWERTOGLE.onOptionsItemSelected(项目)){
返回true;
}
返回false;
}
私有类DrawerItemClickListener实现
ListView.com侦听器{
@凌驾
public void onItemClick(AdapterView父视图、视图、整型位置、,
长id){
选择项目(位置);
}
}
}
这是墙纸活动:
public class Wallpaper extends SherlockActivity implements AdapterView.OnItemSelectedListener,
OnClickListener {
private Gallery mGallery;
private ImageView mImageView;
private boolean mIsWallpaperSet;
private Bitmap mBitmap;
private ArrayList<Integer> mThumbs;
private ArrayList<Integer> mImages;
private WallpaperLoader mLoader;
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
requestWindowFeature(Window.FEATURE_NO_TITLE);
findWallpapers();
setContentView(R.layout.wallpaper_chooser);
mGallery = (Gallery) findViewById(R.id.gallery);
mGallery.setAdapter(new ImageAdapter(this));
mGallery.setOnItemSelectedListener(this);
mGallery.setCallbackDuringFling(false);
findViewById(R.id.set).setOnClickListener(this);
mImageView = (ImageView) findViewById(R.id.wallpaper);
}
private void findWallpapers() {
mThumbs = new ArrayList<Integer>(24);
mImages = new ArrayList<Integer>(24);
final Resources resources = getResources();
final String packageName = getApplication().getPackageName();
addWallpapers(resources, packageName, R.array.wallpapers);
addWallpapers(resources, packageName, R.array.extra_wallpapers);
}
private void addWallpapers(Resources resources, String packageName, int list) {
final String[] extras = resources.getStringArray(list);
for (String extra : extras) {
int res = resources.getIdentifier(extra, "drawable", packageName);
if (res != 0) {
final int thumbRes = resources.getIdentifier(extra + "_small",
"drawable", packageName);
if (thumbRes != 0) {
mThumbs.add(thumbRes);
mImages.add(res);
}
}
}
}
@Override
protected void onResume() {
super.onResume();
mIsWallpaperSet = false;
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mLoader != null && mLoader.getStatus() != WallpaperLoader.Status.FINISHED) {
mLoader.cancel(true);
mLoader = null;
}
}
@Override
public void onItemSelected(AdapterView<?> parent, View v, int position, long id) {
if (mLoader != null && mLoader.getStatus() != WallpaperLoader.Status.FINISHED) {
mLoader.cancel();
}
mLoader = (WallpaperLoader) new WallpaperLoader().execute(position);
}
private void selectWallpaper(int position) {
if (mIsWallpaperSet) {
return;
}
mIsWallpaperSet = true;
try {
InputStream stream = getResources().openRawResource(mImages.get(position));
setWallpaper(stream);
setResult(RESULT_OK);
finish();
} catch (IOException e) {
Log.e("Template", "Failed to set wallpaper: " + e);
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
private class ImageAdapter extends BaseAdapter {
private LayoutInflater mLayoutInflater;
ImageAdapter(Wallpaper context) {
mLayoutInflater = context.getLayoutInflater();
}
@Override
public int getCount() {
return mThumbs.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView image;
if (convertView == null) {
image = (ImageView) mLayoutInflater.inflate(R.layout.wallpaper_item, parent, false);
} else {
image = (ImageView) convertView;
}
int thumbRes = mThumbs.get(position);
image.setImageResource(thumbRes);
Drawable thumbDrawable = image.getDrawable();
if (thumbDrawable != null) {
thumbDrawable.setDither(true);
} else {
Log.e("Template", String.format(
"Error decoding thumbnail resId=%d for wallpaper #%d",
thumbRes, position));
}
return image;
}
}
@Override
public void onClick(View v) {
selectWallpaper(mGallery.getSelectedItemPosition());
}
class WallpaperLoader extends AsyncTask<Integer, Void, Bitmap> {
BitmapFactory.Options mOptions;
WallpaperLoader() {
mOptions = new BitmapFactory.Options();
mOptions.inDither = false;
mOptions.inPreferredConfig = Bitmap.Config.ARGB_8888;
}
@Override
protected Bitmap doInBackground(Integer... params) {
if (isCancelled()) return null;
try {
return BitmapFactory.decodeResource(getResources(),
mImages.get(params[0]), mOptions);
} catch (OutOfMemoryError e) {
return null;
}
}
@Override
protected void onPostExecute(Bitmap b) {
if (b == null) return;
if (!isCancelled() && !mOptions.mCancel) {
if (mBitmap != null) {
mBitmap.recycle();
}
final ImageView view = mImageView;
view.setImageBitmap(b);
mBitmap = b;
final Drawable drawable = view.getDrawable();
drawable.setFilterBitmap(true);
drawable.setDither(true);
view.postInvalidate();
mLoader = null;
} else {
b.recycle();
}
}
void cancel() {
mOptions.requestCancelDecode();
super.cancel(true);
}
}
公共类墙纸扩展Sherlock活动实现AdapterView.OnItemSelectedListener,
onclick侦听器{
私人画廊;
私人Imag
Fragment fragment = null;
fragment.setArguments(args); // If the fragment is null, an Exception will occur
case 4:
startActivity(new Intent(this, Wallpaper.class));
break;
if(fragment != null) {
fragment.setArguments(args);
FragmentManager frgManager = getFragmentManager();
frgManager.beginTransaction().replace(R.id.content_frame, fragment)
.commit();
}