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我正在实现一个导航抽屉进入我的应用程序，我想更改字体。下面是我的onCreate方法，我改变了导航抽屉时，应用程序运行崩溃瞬间，我无法弄清楚什么是错的问题的字体Android - 更改抽屉式字体/文本
代码：
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.navdrawer);
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager
.beginTransaction();
Home fragment = new Home();
fragmentTransaction.replace(R.id.llhome, fragment);
fragmentTransaction.commit();
Typeface tf = Typeface.createFromAsset(getAssets(),
"robotomed.ttf");
TextView tv = (TextView) findViewById(R.id.tvmenu);
tv.setTypeface(tf);
mPlanetTitles = getResources().getStringArray(R.array.planets_array);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
mDrawerList.setAdapter(new ArrayAdapter<String>(this,
R.layout.drawer_list_item, mPlanetTitles));
// Set the list's click listener
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerToggle = new ActionBarDrawerToggle(this, /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer icon to replace 'Up' caret */
R.string.drawer_open, /* "open drawer" description */
R.string.drawer_close /* "close drawer" description */
) {
/** Called when a drawer has settled in a completely closed state. */
public void onDrawerClosed(View view) {
getActionBar().setTitle("Home");
}
/** Called when a drawer has settled in a completely open state. */
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle("StayHealthy");
}
};
// Set the drawer toggle as the DrawerListener
mDrawerLayout.setDrawerListener(mDrawerToggle);
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
}
这里是我的logcat的
06-22 21:44:21.562: E/AndroidRuntime(32042): FATAL EXCEPTION: main
06-22 21:44:21.562: E/AndroidRuntime(32042): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.OptimusApps.stayhealthy/com.OptimusApps.stayhealthy.MainActivity}: java.lang.NullPointerException
06-22 21:44:21.562: E/AndroidRuntime(32042): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2079)
06-22 21:44:21.562: E/AndroidRuntime(32042): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2104)
06-22 21:44:21.562: E/AndroidRuntime(32042): at android.app.ActivityThread.access$600(ActivityThread.java:132)
06-22 21:44:21.562: E/AndroidRuntime(32042): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1157)
06-22 21:44:21.562: E/AndroidRuntime(32042): at android.os.Handler.dispatchMessage(Handler.java:99)
06-22 21:44:21.562: E/AndroidRuntime(32042): at android.os.Looper.loop(Looper.java:137)
06-22 21:44:21.562: E/AndroidRuntime(32042): at android.app.ActivityThread.main(ActivityThread.java:4575)
06-22 21:44:21.562: E/AndroidRuntime(32042): at java.lang.reflect.Method.invokeNative(Native Method)
06-22 21:44:21.562: E/AndroidRuntime(32042): at java.lang.reflect.Method.invoke(Method.java:511)
06-22 21:44:21.562: E/AndroidRuntime(32042): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
06-22 21:44:21.562: E/AndroidRuntime(32042): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
06-22 21:44:21.562: E/AndroidRuntime(32042): at dalvik.system.NativeStart.main(Native Method)
06-22 21:44:21.562: E/AndroidRuntime(32042): Caused by: java.lang.NullPointerException
06-22 21:44:21.562: E/AndroidRuntime(32042): at com.OptimusApps.stayhealthy.MainActivity.onCreate(MainActivity.java:40)
06-22 21:44:21.562: E/AndroidRuntime(32042): at android.app.Activity.performCreate(Activity.java:4465)
06-22 21:44:21.562: E/AndroidRuntime(32042): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
06-22 21:44:21.562: E/AndroidRuntime(32042): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2033)
06-22 21:44:21.562: E/AndroidRuntime(32042): ... 11 more