将textview设置为导入字体时强制关闭应用程序

Question

我有一个应用程序与滑动菜单，并设置了一个字体Roboto字体为Mainactivity还在资产中创建了一个文件夹并粘贴字体。 但是，当我运行应用程序它强制关闭。 请帮帮我。

Mainactivity.java

import java.util.ArrayList; 
import android.app.Activity; 
import android.app.Fragment; 
import android.app.FragmentManager; 
import android.content.Intent; 
import android.content.res.Configuration; 
import android.content.res.TypedArray; 
import android.graphics.Typeface; 
import android.os.Bundle; 
import android.support.v4.app.ActionBarDrawerToggle; 
import android.support.v4.widget.DrawerLayout; 
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 android.widget.TextView; 

public class MainActivity 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.activity_main); 

     Typeface tf = Typeface.createFromAsset(getAssets(), 
       "fonts/Roboto-Regular.ttf"); 
     TextView tv = (TextView) findViewById(R.id.title); 
     tv.setTypeface(tf); 


     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))); 
     // 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))); 
     // What's hot, We will add a counter here 
     navDrawerItems.add(new NavDrawerItem(navMenuTitles[6], navMenuIcons.getResourceId(6, -1))); 


     // 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 
    * */ 
    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: 
      Intent intent = new Intent(this, Projects.class); 
      startActivity(intent); 

     break; 
     case 2: 
      fragment = new Aboutus(); 
      break; 
     case 3: 
      fragment = new Services(); 
      break; 
     case 4: 
      fragment = new News_events(); 
      break; 
     case 5: 
      Intent intent2 = new Intent(this, Gallery.class); 
      startActivity(intent2); 

     case 6: 
      fragment = new Contactus(); 
      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); 
    } 

} 

logcat的

12-04 07:23:40.905: E/AndroidRuntime(3654): FATAL EXCEPTION: main 
12-04 07:23:40.905: E/AndroidRuntime(3654): java.lang.RuntimeException: Unable to start activity ComponentInfo{info.paarva.CrescentBuilders/info.paarva.slidingmenu.MainActivity}: java.lang.NullPointerException 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at android.app.ActivityThread.access$600(ActivityThread.java:141) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at android.os.Handler.dispatchMessage(Handler.java:99) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at android.os.Looper.loop(Looper.java:137) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at android.app.ActivityThread.main(ActivityThread.java:5103) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at java.lang.reflect.Method.invoke(Method.java:525) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at dalvik.system.NativeStart.main(Native Method) 
12-04 07:23:40.905: E/AndroidRuntime(3654): Caused by: java.lang.NullPointerException 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at info.paarva.slidingmenu.MainActivity.onCreate(MainActivity.java:54) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at android.app.Activity.performCreate(Activity.java:5133) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) 
12-04 07:23:40.905: E/AndroidRuntime(3654):  ... 11 more 
12-04 07:23:42.341: I/Process(3654): Sending signal. PID: 3654 SIG: 9 

Activitymain.xml

<android.support.v4.widget.DrawerLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/drawer_layout" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <!-- Framelayout to display Fragments --> 
    <FrameLayout 
     android:id="@+id/frame_container" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 

    <!-- Listview to display slider menu --> 
    <ListView 
     android:id="@+id/list_slidermenu" 
     android:layout_width="240dp" 
     android:layout_height="match_parent" 
     android:layout_gravity="start" 
     android:choiceMode="singleChoice" 
     android:divider="@color/list_divider" 
     android:dividerHeight="1dp"   
     android:listSelector="@drawable/list_selector" 
     android:background="@color/list_background"/> 
</android.support.v4.widget.DrawerLayout> 

drawer_list_item.xml

<?xml version="1.0" encoding="utf-8"?> 
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="match_parent" 
     android:layout_height="100dp" 
     android:background="@drawable/list_selector"> 

     <ImageView 
      android:id="@+id/icon" 
      android:layout_width="25dp" 
      android:layout_height="wrap_content" 
      android:layout_alignParentLeft="true" 
      android:layout_marginLeft="12dp" 
      android:layout_marginRight="12dp" 
      android:contentDescription="@string/desc_list_item_icon" 
      android:src="@drawable/icon_home" 
      android:layout_centerVertical="true" /> 

     <TextView 
      android:id="@+id/title" 
      android:layout_width="wrap_content" 
      android:layout_height="match_parent" 
      android:layout_toRightOf="@id/icon" 
      android:minHeight="?android:attr/listPreferredItemHeightSmall" 
      android:textAppearance="?android:attr/textAppearanceListItemSmall" 
      android:textColor="@color/list_item_title" 
      android:gravity="center_vertical" 
      android:layout_centerVertical="true" 
      android:paddingTop="10dip" 
      android:paddingLeft="10dp"/> 

     <TextView android:id="@+id/counter" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:background="@drawable/counter_bg" 
      android:layout_alignParentRight="true" 
      android:layout_centerVertical="true" 
      android:layout_marginRight="8dp" 
      android:textColor="@color/counter_text_color"/> 

    </RelativeLayout> 

NavDrawerListAdapter

import java.util.ArrayList; 
import android.app.Activity; 
import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.ImageView; 
import android.widget.TextView; 

public class NavDrawerListAdapter extends BaseAdapter { 

    private Context context; 
    private ArrayList<NavDrawerItem> navDrawerItems; 

    public NavDrawerListAdapter(Context context, ArrayList<NavDrawerItem> navDrawerItems){ 
     this.context = context; 
     this.navDrawerItems = navDrawerItems; 
    } 

    @Override 
    public int getCount() { 
     return navDrawerItems.size(); 
    } 

    @Override 
    public Object getItem(int position) {  
     return navDrawerItems.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     if (convertView == null) { 
      LayoutInflater mInflater = (LayoutInflater) 
        context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE); 
      convertView = mInflater.inflate(R.layout.drawer_list_item, null); 
     } 

     ImageView imgIcon = (ImageView) convertView.findViewById(R.id.icon); 
     TextView txtTitle = (TextView) convertView.findViewById(R.id.title); 
     TextView txtCount = (TextView) convertView.findViewById(R.id.counter); 

     imgIcon.setImageResource(navDrawerItems.get(position).getIcon());   
     txtTitle.setText(navDrawerItems.get(position).getTitle()); 

     // displaying count 
     // check whether it set visible or not 
     if(navDrawerItems.get(position).getCounterVisibility()){ 
      txtCount.setText(navDrawerItems.get(position).getCount()); 
     }else{ 
      // hide the counter view 
      txtCount.setVisibility(View.GONE); 
     } 

     return convertView; 
    } 

} 

Answer 1

设置字体的文本视图getView，从主要活动中删除TextView的。

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    if (convertView == null) { 
     LayoutInflater mInflater = (LayoutInflater) 
       context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE); 
     convertView = mInflater.inflate(R.layout.drawer_list_item, null); 
    } 

    ImageView imgIcon = (ImageView) convertView.findViewById(R.id.icon); 
    TextView txtTitle = (TextView) convertView.findViewById(R.id.title); 
    TextView txtCount = (TextView) convertView.findViewById(R.id.counter); 

    Typeface tf = Typeface.createFromAsset(context.getAssets(), 
      "fonts/Roboto-Regular.ttf"); 
    txtTitle.setTypeface(tf); 

    imgIcon.setImageResource(navDrawerItems.get(position).getIcon());   
    txtTitle.setText(navDrawerItems.get(position).getTitle()); 

    // displaying count 
    // check whether it set visible or not 
    if(navDrawerItems.get(position).getCounterVisibility()){ 
     txtCount.setText(navDrawerItems.get(position).getCount()); 
    }else{ 
     // hide the counter view 
     txtCount.setVisibility(View.GONE); 
    } 

    return convertView; 
} 

Answer 2

删除fonts尝试这样

Typeface tf = Typeface.createFromAsset(getAssets(), 
       "Roboto-Regular.ttf"); 
     TextView tv = (TextView) findViewById(R.id.title); 
     tv.setTypeface(tf); 

吹气布局尝试这样

LayoutInflater inflater = LayoutInflater.from(MainActivity.this); 
View theInflatedView = inflater.inflate(R.layout.drawer_list_item, null); 
Typeface tf = Typeface.createFromAsset(getAssets(), 
        "Roboto-Regular.ttf"); 
TextView tv = (TextView) theInflatedView .findViewById(R.id.title); 
tv.setTypeface(tf);