我正在尝试在仪表板Navigation Drawer Activity
上实现Activity
。在我的应用程序中,我创建了一个主题,其中删除了“工具栏/ ActionBar”,并将汉堡菜单的ImageView
放在custom layout
上,并将其包含在我的仪表板布局中。我要的是单击此ImageView
时将显示滑动抽屉。
我想做的是通过com.project.projectname-> New-> activity->'Navigation Drawer Activity'添加一个Navigation Drawer Activity
,并自动添加NavigationActivity class , activity_navigation.xmlapp_bar_navigation.xml, etc
。
但是我想知道如何打开抽屉?
在我的Dashboard Activity
中,我添加了这个
public class DashboardActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dashboard);
View side_tab = findViewById(R.id.side_tab);
expanded_menu = (ImageView) side_tab.findViewById(R.id.expanded_menu);
expanded_menu.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
// open drawer here
}
});
另外,在
NavigationActivity
中它使用ActionBarDrawerToggle
,我不能使用它,因为我没有应用ActionBar
。但是我可以使用什么替代方法呢?这是我的
NavigationActivity
public class NavigationActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_navigation);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.navigation, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
Intent goToSreen;
if (id == R.id.nav_dashboard) {
goToSreen = new Intent(NavigationActivity.this, DashboardActivity.class);
startActivity(goToSreen);
} else if (id == R.id.nav_others) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
感谢您的热心帮助。
更新资料
因此,在“仪表板活动”中,我添加了以下内容
NavigationActivity navigationActivity;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dashboard);
View side_tab = findViewById(R.id.side_tab);
expanded_menu = (ImageView) side_tab.findViewById(R.id.expanded_menu);
expanded_menu.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
navigationActivity = new NavigationActivity() ;
navigationActivity.drawer.openDrawer(GravityCompat.START);
}
});
在我的导航活动中,添加一个全局变量
public class NavigationActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
DrawerLayout drawer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_navigation);
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
我已经设法在“仪表板活动”中调用
drawer
,但是单击汉堡菜单时,滑动菜单仍然不显示。该应用程序崩溃并显示java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.widget.DrawerLayout.openDrawer(int)' on a null object reference
最佳答案
将此添加到NavigationActivity中
public class NavigationActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
//Add this line
public static DrawerLayout drawer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_navigation);
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
.......
接下来改变这个
expanded_menu.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
// open drawer here
NavigationActivity. drawer.openDrawer(GravityCompat.START);
}
});
尝试此希望可以解决您的问题。
关于android - 单击ImageView时如何打开“滑动抽屉导航”?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/43775173/