我想使用创建两个滑动选项卡ActionBar
。
这是我的代码:
import android.app.ActionBar;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import com.rastari.salar.mymetarialbank.R;
/**
* Created by Salar on 9/5/2015.
*/
public class AccountsActivityChart extends FragmentActivity implements ActionBar.TabListener {
ActionBar actionBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chart);
actionBar=getActionBar();
actionBar.setNavigationMode(actionBar.NAVIGATION_MODE_TABS);
//Add the Action Bar Tabs
actionBar.addTab(actionBar.newTab().setText("Accounts Activity"+"Chart Activity").setTabListener(this));
}
@Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
}
@Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
}
@Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
}
}
当我运行应用程序时,会发生此错误:
> 05-11 06:09:28.013 2371-2371/? E/AndroidRuntime﹕ FATAL EXCEPTION:
> main
> Process: com.rastari.salar.mymetarialbank, PID: 2371
> java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rastari.salar.mymetarialbank/com.rastari.salar.mymetarialbank.activity.AccountsActivityChart}:
> java.lang.NullPointerException: Attempt to invoke virtual method 'void
> android.app.ActionBar.setNavigationMode(int)' on a null object
> reference
> at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
> at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
> at android.app.ActivityThread.access$800(ActivityThread.java:151)
> at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
> at android.os.Handler.dispatchMessage(Handler.java:102)
> at android.os.Looper.loop(Looper.java:135)
> at android.app.ActivityThread.main(ActivityThread.java:5254)
> at java.lang.reflect.Method.invoke(Native Method)
> at java.lang.reflect.Method.invoke(Method.java:372)
> at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
> at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
> Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setNavigationMode(int)' on
> a null object reference
> at com.rastari.salar.mymetarialbank.activity.AccountsActivityChart.onCreate(AccountsActivityChart.java:21)
> at android.app.Activity.performCreate(Activity.java:5990)
> at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
> at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
> at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
> at android.app.ActivityThread.access$800(ActivityThread.java:151)
> at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
> at android.os.Handler.dispatchMessage(Handler.java:102)
> at android.os.Looper.loop(Looper.java:135)
> at android.app.ActivityThread.main(ActivityThread.java:5254)
> at java.lang.reflect.Method.invoke(Native Method)
> at java.lang.reflect.Method.invoke(Method.java:372)
> at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
> at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 05-11
> 06:09:30.037 444-504/? E/InputDispatcher﹕ channel '155e1fbc
> com.rastari.salar.mymetarialbank/com.rastari.salar.mymetarialbank.activity.MainActivity
> (server)' ~ Channel is unrecoverably broken and will be disposed!
> 05-11 06:09:30.037 444-504/? E/InputDispatcher﹕ channel '2f2170b7
> com.rastari.salar.mymetarialbank/com.rastari.salar.mymetarialbank.activity.Login
> (server)' ~ Channel is unrecoverably broken and will be disposed!
我真的不知道该怎么办!你们能指导我吗?太感谢了。
最新代码:
import android.support.v7.app.ActionBar
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import com.rastari.salar.mymetarialbank.R;
public class AccountsActivityChart extends ActionBarActivity implements ActionBar.TabListener {
ActionBar actionBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chart);
actionBar = getSupportActionBar();
actionBar.setNavigationMode(actionBar.NAVIGATION_MODE_TABS);
//Add the Action Bar Tabs
actionBar.addTab(actionBar.newTab().setText("Accounts Activity"+"Chart Activity").setTabListener(this));
}
@Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
}
@Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
}
@Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
}
}
首先,您正在创建一个FragmentActivity
并希望看到ActionBar
不会发生的情况。
代替
AccountsActivityChart extends FragmentActivity
和
AccountsActivityChart extends ActionBarActivity
其次,你需要打电话
actionBar = getSupportActionBar();
代替
actionBar = getActionBar();
因为它ActionBarActivity
是appcompat-v7
图书馆的一部分。这就是为什么您的应用在调用时崩溃的原因actionBar.setNavigationMode()
,因为与一起使用时会getActionBar()
返回。null
FragmentActivity
完成此操作后,您应该可以使用
actionBar.setNavigationMode(actionBar.NAVIGATION_MODE_TABS);
成功并看到您下方的可滑动标签ActionBar
。
编辑:
代替
import android.app.ActionBar
和
import android.support.v7.app.ActionBar
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