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android - 在 android 侧边栏创建中获取错误并修复此问题

转载 作者:行者123 更新时间:2023-11-30 01:40:49 24 4
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package com.example.bulksms;

import java.util.ArrayList;


import com.example.bulksms.adapter.NavDrawerListAdapter;
import com.example.bulksms.model.NavDrawerItem;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.widget.DrawerLayout;
import android.support.v4.app.ActionBarDrawerToggle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import com.example.bulksms.R;

@SuppressWarnings("deprecation")
@SuppressLint("NewApi")
public class Home extends Activity {

private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;

// nav drawer title
private CharSequence mDrawerTitle;

// used to store app title
private CharSequence mTitle;

// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;

private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;

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

//if TheradPolicy When app crash automatically.
//StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadPolicy(policy);

mTitle = mDrawerTitle = getTitle();

// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);

// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);

mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);

navDrawerItems = new ArrayList<NavDrawerItem>();

// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1), true, "22"));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
// What's hot, We will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), true, "50+"));


// Recycle the typed array
navMenuIcons.recycle();

mDrawerList.setOnItemClickListener(new SlideMenuClickListener());

// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);

// enabling action bar app icon and behaving it as toggle button
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);

mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, //nav menu toggle icon
R.string.app_name, // nav drawer open - description for accessibility
R.string.app_name // nav drawer close - description for accessibility
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}

public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);

if (savedInstanceState == null) {
// on first time display view for first nav item
displayView(0);
}
}

/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// display view for selected nav drawer item
displayView(position);
}
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}

/* *
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}

/**
* Diplaying fragment view for selected nav drawer list item
* */
@SuppressLint("NewApi")
private void displayView(int position) {
// update the main content by replacing fragments
Fragment fragment = null;
switch (position) {
case 0:
fragment = new HomeFragment();
break;
case 1:
fragment = new FindPeopleFragment();
break;
case 2:
fragment = new PhotosFragment();
break;
case 3:
fragment = new CommunityFragment();
break;
case 4:
fragment = new PagesFragment();
break;
case 5:
fragment = new WhatsHotFragment();
break;

default:
break;
}

if (fragment != null) {
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit();

// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}

@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);
}

}

#这里是错误代码#

 - 12-30 15:16:23.733: E/AndroidRuntime(2814): FATAL EXCEPTION: main
12-30 15:16:23.733: E/AndroidRuntime(2814): Process:
com.example.bulksms, PID: 2814 12-30 15:16:23.733:
E/AndroidRuntime(2814): java.lang.RuntimeException: Unable to start
activity ComponentInfo{com.example.bulksms/com.example.bulksms.Home}:
java.lang.NullPointerException 12-30 15:16:23.733:
E/AndroidRuntime(2814): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2367)
12-30 15:16:23.733: E/AndroidRuntime(2814): at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2419)
12-30 15:16:23.733: E/AndroidRuntime(2814): at
android.app.ActivityThread.access$800(ActivityThread.java:151) 12-30
15:16:23.733: E/AndroidRuntime(2814): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342)
12-30 15:16:23.733: E/AndroidRuntime(2814): at
android.os.Handler.dispatchMessage(Handler.java:110) 12-30
15:16:23.733: E/AndroidRuntime(2814): at
android.os.Looper.loop(Looper.java:193) 12-30 15:16:23.733:
E/AndroidRuntime(2814): at
android.app.ActivityThread.main(ActivityThread.java:5323) 12-30
15:16:23.733: E/AndroidRuntime(2814): at
java.lang.reflect.Method.invokeNative(Native Method) 12-30
15:16:23.733: E/AndroidRuntime(2814): at
java.lang.reflect.Method.invoke(Method.java:515) 12-30 15:16:23.733:
E/AndroidRuntime(2814): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828)
12-30 15:16:23.733: E/AndroidRuntime(2814): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644) 12-30
15:16:23.733: E/AndroidRuntime(2814): at
dalvik.system.NativeStart.main(Native Method) 12-30 15:16:23.733:
E/AndroidRuntime(2814): Caused by: java.lang.NullPointerException
12-30 15:16:23.733: E/AndroidRuntime(2814): at
com.example.bulksms.Home.onCreate(Home.java:97) 12-30 15:16:23.733:
E/AndroidRuntime(2814): at
android.app.Activity.performCreate(Activity.java:5343) 12-30
15:16:23.733: E/AndroidRuntime(2814): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
12-30 15:16:23.733: E/AndroidRuntime(2814): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2331)
12-30 15:16:23.733: E/AndroidRuntime(2814): ... 11 more

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