[英]Navigation drawer Fragment Issue
Hi i have this problem with my navigation drawer. 嗨,我的导航抽屉有这个问题。 The drawer opens fine but i am having problems with the onClickListener. 抽屉可以打开,但是onClickListener出现问题。 if an item on the drawer is clicked on it doesnt show the related layout instaed a black page shows. 如果在抽屉上单击某个项目,则不会显示相关的布局,而是会显示黑页。 Please help 请帮忙
home.java
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.support.design.widget.NavigationView;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SubMenu;
import android.view.View;
import android.widget.Toast;
public class home extends AppCompatActivity {
//Defining Variables
private Toolbar toolbar;
private NavigationView navigationView;
private DrawerLayout drawerLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
// Initializing Toolbar and setting it as the actionbar
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//Initializing NavigationView
navigationView = (NavigationView) findViewById(R.id.navigation_view);
//Setting Navigation View Item Selected Listener to handle the item click of the navigation menu
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
// This method will trigger on item Click of navigation menu
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
//Checking if the item is in checked state or not, if not make it in checked state
if(menuItem.isChecked()) menuItem.setChecked(false);
else menuItem.setChecked(true);
//Closing drawer on item click
drawerLayout.closeDrawers();
//Check to see which item was being clicked and perform appropriate action
switch (menuItem.getItemId()){
//Replacing the main content with ContentFragment Which is our Inbox View;
case R.id.dashboard:
Toast.makeText(getApplicationContext(),"dashboard",Toast.LENGTH_SHORT).show();
Dashboard fragment = new Dashboard();
android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,fragment);
fragmentTransaction.commit();
break;
// For rest of the options we just show a toast on click
case R.id.profile:
Toast.makeText(getApplicationContext(),"profile",Toast.LENGTH_SHORT).show();
new Profile();
break;
case R.id.logs:
Toast.makeText(getApplicationContext(),"logs",Toast.LENGTH_SHORT).show();
new Logs();
break;
case R.id.statements:
Toast.makeText(getApplicationContext(),"statements",Toast.LENGTH_SHORT).show();
new Statements();
break;
case R.id.timeline:
Toast.makeText(getApplicationContext(),"timeliine",Toast.LENGTH_SHORT).show();
new Timeline();
break;
case R.id.settings:
Toast.makeText(getApplicationContext(),"settings",Toast.LENGTH_SHORT).show();
new Settings();
break;
default:
Toast.makeText(getApplicationContext(),"Somethings Wrong",Toast.LENGTH_SHORT).show();
break;
}
return true; }
});
// Initializing Drawer Layout and ActionBarToggle
drawerLayout = (DrawerLayout) findViewById(R.id.drawer);
ActionBarDrawerToggle actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.openDrawer, R.string.closeDrawer){
@Override
public void onDrawerClosed(View drawerView) {
// Code here will be triggered once the drawer closes as we dont want anything to happen so we leave this blank
super.onDrawerClosed(drawerView);
}
@Override
public void onDrawerOpened(View drawerView) {
// Code here will be triggered once the drawer open as we dont want anything to happen so we leave this blank
super.onDrawerOpened(drawerView);
}
};
//Setting the actionbarToggle to drawer layout
drawerLayout.setDrawerListener(actionBarDrawerToggle);
//calling sync state is necessay or else your hamburger icon wont show up
actionBarDrawerToggle.syncState();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, 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);
}
}
You're not switching fragments correctly in your case
statements. 您没有在case
语句中正确切换片段。 You're only instantiating a new Fragment class and not doing anything with it. 您只实例化一个新的Fragment类,而不对它做任何事情。 You need to do something like this: 您需要执行以下操作:
Fragment fragment;
switch (menuItem.getItemId()){
//Replacing the main content with ContentFragment Which is our Inbox View;
case R.id.dashboard:
Toast.makeText(getApplicationContext(),"dashboard",Toast.LENGTH_SHORT).show();
fragment = new Dashboard();
break;
// For rest of the options we just show a toast on click
case R.id.profile:
Toast.makeText(getApplicationContext(),"profile",Toast.LENGTH_SHORT).show();
fragment = new Profile();
break;
case R.id.logs:
Toast.makeText(getApplicationContext(),"logs",Toast.LENGTH_SHORT).show();
fragment = new Logs();
break;
case R.id.statements:
Toast.makeText(getApplicationContext(),"statements",Toast.LENGTH_SHORT).show();
fragment = new Statements();
break;
case R.id.timeline:
Toast.makeText(getApplicationContext(),"timeliine",Toast.LENGTH_SHORT).show();
fragment = new Timeline();
break;
case R.id.settings:
Toast.makeText(getApplicationContext(),"settings",Toast.LENGTH_SHORT).show();
fragment = new Settings();
break;
default:
Toast.makeText(getApplicationContext(),"Somethings Wrong",Toast.LENGTH_SHORT).show();
break;
}
android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,fragment);
fragmentTransaction.commit();
This way you're instantiating a fragment with a proper Fragment class each time, and at the end, replacing the frame with that particular fragment. 这样,您每次都使用适当的Fragment类实例化一个片段,最后,用该特定片段替换帧。
Digresion: It is recommended that you use
newInstance
to get the fragments and not the constructor. Digresion:建议您使用newInstance
而不是构造函数来获取片段。 This is known as the Singleton design pattern. 这称为Singleton设计模式。
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