错误抽屉式导航栏 [英] Error in Navigation Drawer
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问题描述
不知怎的,我得到一个空指针异常此方法中
@覆盖
保护无效onPostCreate(捆绑savedInstanceState){
super.onPostCreate(savedInstanceState);
actionBarToggle.syncState();
}
actionBarToggle.syncState()
在这有一个空指针异常。
现在,如果我注释掉这再有就是空指针异常,当我触碰动作条,打开抽屉式导航
如果(actionBarToggle.onOptionsItemSelected(项目)){
返回true;
}
解决方案
我发现这个问题实际上我在做这个
actionBarToggle =新ActionBarDrawerToggle(这一点,drawerLayout,
R.drawable.ic_drawer,R.string.drawerOpen,R.string.drawerClose){
公共无效onDrawerClosed(查看视图){
getSupportActionBar()的setTitle(关)。
ActivityCompat.invalidateOptionsMenu(活动);
} 公共无效onDrawerOpened(查看主){
getSupportActionBar()的setTitle(打开)。
ActivityCompat.invalidateOptionsMenu(活动);
}
};
drawerLayout.setDrawerListener(actionBarToggle);
drawerLayout =(DrawerLayout)findViewById(R.id.navigationDrawer); //这应该是actionBarToggle前
于是我就在actionBarToggle使用后intailizing的drawerLayout。
Somehow I am getting a null pointer Exception in this method
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
actionBarToggle.syncState();
}
actionBarToggle.syncState()
in this there is a null pointer exception.
Now if I comment out this then there is null pointer exception when i touch the actionbar to open navigation drawer
if (actionBarToggle.onOptionsItemSelected(item)) {
return true;
}
解决方案
I found the problem actually I was doing this
actionBarToggle = new ActionBarDrawerToggle(this, drawerLayout,
R.drawable.ic_drawer, R.string.drawerOpen, R.string.drawerClose) {
public void onDrawerClosed(View view) {
getSupportActionBar().setTitle("Close");
ActivityCompat.invalidateOptionsMenu(activity);
}
public void onDrawerOpened(View main) {
getSupportActionBar().setTitle("Open");
ActivityCompat.invalidateOptionsMenu(activity);
}
};
drawerLayout.setDrawerListener(actionBarToggle);
drawerLayout = (DrawerLayout) findViewById(R.id.navigationDrawer);//This should be before actionBarToggle
So I was intailizing the drawerLayout after using it in actionBarToggle.
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