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我有一个与导航抽屉有关的非常基本的问题。 我做了一个具有导航抽屉的应用程序，但我不知道如何更改导航抽屉中选择项的视图，但是我可以在每次点击时显示一个敬酒，这意味着问题在切换碎片在运行期间。如何通过导航抽屉在碎片之间切换？
这是我的主要代码：
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.res.Configuration;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.GestureDetector;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity{
String TITLES[] = {"Home","Search","Recent Logs","My Wallet","Settings","Logout"};
int ICONS[] = {R.drawable.ic_action,R.drawable.ic_action_search,R.drawable.ic_action_logs,
R.drawable.ic_action_wallet,R.drawable.ic_action_settings,R.drawable.ic_action_logout};
String NAME = "Akash Bangad";
String EMAIL = "[email protected]";
int PROFILE = R.drawable.default_user;
Toolbar toolbar;
RecyclerView mRecyclerView;
RecyclerView.Adapter mAdapter;
RecyclerView.LayoutManager mLayoutManager;
DrawerLayout Drawer;
ActionBarDrawerToggle mDrawerToggle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.tool_bar);
setSupportActionBar(toolbar);
mRecyclerView = (RecyclerView) findViewById(R.id.RecyclerView);
mRecyclerView.setHasFixedSize(true);
mAdapter = new MyAdapter(TITLES,ICONS,NAME,EMAIL,PROFILE);
mRecyclerView.setAdapter(mAdapter);
//Detect Gestures
final GestureDetector mGestureDetector = new GestureDetector(MainActivity.this, new GestureDetector.SimpleOnGestureListener() {
@Override public boolean onSingleTapUp(MotionEvent e) {
return true;
}
});
//Listen for clicks on navigation drawer
mRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
@Override
public boolean onInterceptTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
View child = recyclerView.findChildViewUnder(motionEvent.getX(),motionEvent.getY());
if(child!=null && mGestureDetector.onTouchEvent(motionEvent) && recyclerView.getChildPosition(child)>0){
Drawer.closeDrawers();
Toast.makeText(MainActivity.this,TITLES[recyclerView.getChildPosition(child)-1], Toast.LENGTH_SHORT).show();
selectItem(recyclerView.getChildPosition(child)-1);
Fragment fragment;
FragmentManager fragmentManager = getFragmentManager(); // For AppCompat use getSupportFragmentManager
switch(recyclerView.getChildPosition(child)) {
default:
case 1:
fragment = new ProfileInfoFragment();
break;
}
fragmentManager.beginTransaction()
.replace(R.id.mainLayout, fragment)
.commit();
return true;
}
return false;
}
@Override
public void onTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
}
});
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
Drawer = (DrawerLayout) findViewById(R.id.DrawerLayout);
mDrawerToggle = new ActionBarDrawerToggle(this,Drawer,toolbar,R.string.openDrawer,R.string.closeDrawer){
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
}
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
}
};
Drawer.setDrawerListener(mDrawerToggle);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mDrawerToggle.syncState();
}
public void selectItem(int i) {
getSupportActionBar().setTitle(TITLES[i]);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
else if(mDrawerToggle.onOptionsItemSelected(item)){
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/DrawerLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:elevation="7dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="@+id/mainLayout">
<include
android:id="@+id/tool_bar"
layout="@layout/tool_bar">
</include>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/RecyclerView"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="left"
android:background="#ffffff"
android:scrollbars="vertical">
</android.support.v7.widget.RecyclerView>
我现在已经创建了一个简单的片段，我想在应用切换在导航抽屉中的某个项目上点击该片段。目前我正在用我的片段替换mainLayout，但是这给了我ClassCastException。
Process: com.pocketcash.pocketcash, PID: 2456
java.lang.ClassCastException: [email protected]
at com.pocketcash.pocketcash.ProfileInfoFragment.onAttach(ProfileInfoFragment.java:31)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:853)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067)
at android.app.BackStackRecord.run(BackStackRecord.java:833)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1452)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:447)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
尝试切换到getSupportFragmentManager（）。也请张贴您的错误。 – natario
请勿使用'LinearLayout'。尝试用'FrameLayout' – Yugesh
正如我所提到的，当我尝试用我的片段切换mainLayout时，我得到一个ClassCastException。我不确定这是否是在导航抽屉中执行此操作的正确方法，所以我希望您能指导我在代码中添加哪些内容以在运行时切换片段。 –