Java 不切换导航抽屉的片段
我正在试着把导航抽屉放下,我已经在互联网上学习了一些教程,但是它们最终都不起作用。现在我知道这很简单,但我想不出来。菜单打开,主片段加载,但若我点击一个新片段,什么都不起作用。想法 activity_main.xml 第二段Java 不切换导航抽屉的片段,java,android,Java,Android,我正在试着把导航抽屉放下,我已经在互联网上学习了一些教程,但是它们最终都不起作用。现在我知道这很简单,但我想不出来。菜单打开,主片段加载,但若我点击一个新片段,什么都不起作用。想法 activity_main.xml 第二段 package com.autotools.autotools; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater;
package com.autotools.autotools;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class autoLoanFragment extends Fragment {
public autoLoanFragment(){
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_autoloan,container,false);
}
}
MainActivity java
package com.autotools.autotools;
import android.support.v4.app.FragmentManager;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
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);
MainFragment fragment = new MainFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.content_frame, fragment);
fragmentTransaction.commit();
}
@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.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);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_home) {
MainFragment fragment = new MainFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.content_frame, fragment);
fragmentTransaction.commit();
} else if (id == R.id.nav_autoLoan) {
autoLoanFragment fragment = new autoLoanFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.content_frame, fragment);
fragmentTransaction.commit();
} else if (id == R.id.nav_gas) {
} else if (id == R.id.nav_settings) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
主xml的片段
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="@+id/textView2"
android:layout_gravity="center_horizontal|top" />
</FrameLayout>
活动\u主\u抽屉xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:checkableBehavior="single">
<item
android:id="@+id/nav_home"
android:icon="@drawable/ic_info_black_48dp"
android:title="Home" />
<item
android:id="@+id/nav_autoLoan"
android:icon="@drawable/ic_attach_money_black_48dp"
android:title="Auto Loan Calculator" />
<item
android:id="@+id/nav_gas"
android:icon="@drawable/ic_local_gas_station_black_48dp"
android:title="Slideshow" />
<item
android:id="@+id/nav_settings"
android:icon="@drawable/ic_settings_black_48dp"
android:title="Settings" />
</group>
<item android:title="Communicate">
<menu>
<item
android:id="@+id/nav_share"
android:icon="@drawable/ic_menu_share"
android:title="Share" />
<item
android:id="@+id/nav_send"
android:icon="@drawable/ic_menu_send"
android:title="Send" />
</menu>
</item>
</menu>
fragment_main.xml中有什么?检查onNavigationItemSelected方法是否被调用。有时,当您拥有视图层次结构时,不会使用“this”来调用它。因此,从外观上看,它在打开和关闭抽屉时正在点击onNavigationItemSelected,但它缺少if语句?除了您的活动之外,nav_Autolon在哪里使用?请显示该文件。它位于创建菜单项的“活动”主抽屉中。我相信这是唯一的地点。
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="@+id/textView2"
android:layout_gravity="center_horizontal|top" />
</FrameLayout>
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:checkableBehavior="single">
<item
android:id="@+id/nav_home"
android:icon="@drawable/ic_info_black_48dp"
android:title="Home" />
<item
android:id="@+id/nav_autoLoan"
android:icon="@drawable/ic_attach_money_black_48dp"
android:title="Auto Loan Calculator" />
<item
android:id="@+id/nav_gas"
android:icon="@drawable/ic_local_gas_station_black_48dp"
android:title="Slideshow" />
<item
android:id="@+id/nav_settings"
android:icon="@drawable/ic_settings_black_48dp"
android:title="Settings" />
</group>
<item android:title="Communicate">
<menu>
<item
android:id="@+id/nav_share"
android:icon="@drawable/ic_menu_share"
android:title="Share" />
<item
android:id="@+id/nav_send"
android:icon="@drawable/ic_menu_send"
android:title="Send" />
</menu>
</item>
</menu>