我的包裹有问题。我认为几乎一切都很好,但它仍然无法正常工作,我不知道为什么,但这是我的代码
类别包裹
public class categoriasParcel implements Parcelable{
public List<String> categorias;
public categoriasParcel(List<String> lista)
{
super();
this.categorias = lista;
}
protected categoriasParcel(Parcel in) {
categorias = new ArrayList<String>();
in.readList(categorias, null);
}
public List<String> getCategorias()
{
return categorias;
}
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
dest.writeList(categorias);
}
public static final Parcelable.Creator<categoriasParcel> CREATOR = new Parcelable.Creator<categoriasParcel>() {
public categoriasParcel createFromParcel(Parcel in) {
return new categoriasParcel(in);
}
public categoriasParcel[] newArray(int size) {
return new categoriasParcel[size];
}
};
}
在我的活动 1 中,我有一个 asynctask
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(InicioActivity.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = jParser.getJSONFromUrl(url);
return json;
}
@Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
if(json != null){
JSONArray datos = json.getJSONArray("datos");
List<String> lista = new ArrayList<String>();
for (int i = 0; i < datos.length(); i++) {
JSONObject jsonObject = datos.getJSONObject(i);
lista.add(jsonObject.getString("nombre"));
}
categoriasParcel cat = new categoriasParcel(lista);
Intent intent = new Intent (getBaseContext(), PrincipalActivity.class);
intent.putExtra("categorias",cat);
startActivity(intent);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
这个,得到一个 JSON 并将每个值放在一个 List 中(获取具有工作值的 JSON,所以没有问题)
这是我的活动 2
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_principal);
Intent intent = getIntent();
categoriasParcel parcelableLaptop = (categoriasParcel) intent
.getParcelableExtra("categorias");
List<String> laptop = parcelableLaptop.getCategorias();
String[] c = laptop.toArray(new String[laptop.size()]);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.lista = c;
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
}
我不知道该怎么办,我尝试了很多方法,但我总是得到一个 NullPointer
这是错误
11-12 10:40:13.500 3457-3457/com.prueba.test E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.prueba.test/com.prueba.test.PrincipalActivity}: android.view.InflateException: Binary XML file line #33: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #33: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270)
at android.app.Activity.setContentView(Activity.java:1881)
at android.support.v7.app.ActionBarActivity.superSetContentView(ActionBarActivity.java:216)
at android.support.v7.app.ActionBarActivityDelegateICS.setContentView(ActionBarActivityDelegateICS.java:111)
at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:76)
at com.prueba.test.PrincipalActivity.onCreate(PrincipalActivity.java:43)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException: storage == null
at java.util.Arrays$ArrayList.<init>(Arrays.java:38)
at java.util.Arrays.asList(Arrays.java:154)
at android.widget.ArrayAdapter.<init>(ArrayAdapter.java:141)
at com.prueba.test.NavigationDrawerFragment.onCreateView(NavigationDrawerFragment.java:106)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:900)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1082)
at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1184)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:291)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270)
at android.app.Activity.setContentView(Activity.java:1881)
at android.support.v7.app.ActionBarActivity.superSetContentView(ActionBarActivity.java:216)
at android.support.v7.app.ActionBarActivityDelegateICS.setContentView(ActionBarActivityDelegateICS.java:111)
at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:76)
at com.prueba.test.PrincipalActivity.onCreate(PrincipalActivity.java:43)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511