Android 单击按钮时更改片段
单击按钮时如何更改片段?我正在使用android studio 1.5和新的导航抽屉 这是我的主要活动。javaAndroid 单击按钮时更改片段,android,android-layout,android-fragments,navigation-drawer,buttonclick,Android,Android Layout,Android Fragments,Navigation Drawer,Buttonclick,单击按钮时如何更改片段?我正在使用android studio 1.5和新的导航抽屉 这是我的主要活动。java import android.os.Bundle; import android.support.design.widget.FloatingActionButton; import android.support.design.widget.Snackbar; import android.view.View; import android.support.design.widge
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 android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
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);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "bryanposvoc1339.garcia@gmail.com", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
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.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) {
int id = item.getItemId();
Fragment fragment;
if (id == R.id.nav_cough) {
fragment = new first();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.mainFrame, fragment);
ft.commit();
}
else if (id == R.id.nav_colds) {
fragment = new second();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.mainFrame, fragment);
ft.commit();
}
else if (id == R.id.nav_fever) {
fragment = new third();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.mainFrame, fragment);
ft.commit();
}
else if (id == R.id.nav_vegetables) {
fragment = new fourth();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.mainFrame, fragment);
ft.commit();
} else if (id == R.id.nav_fruits) {
fragment = new fifth();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.mainFrame, fragment);
ft.commit();
} else if (id == R.id.nav_about) {
fragment = new sixth();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.mainFrame, fragment);
ft.commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* A simple {@link Fragment} subclass.
*/
public class first extends Fragment {
public first() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_first, container, false);
}
}
这是我的活动\u main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<include
layout="@layout/app_bar_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.design.widget.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_main"
app:menu="@menu/activity_main_drawer" />
</android.support.v4.widget.DrawerLayout>
你能让它像当你点击btn1
它进入fragmentOne
和当点击btn2
它进入fragmentTwo
一个if-else语句吗
我在这里放了什么?您可以使用OnfragmentInteractionListener来实现这一点。它是您的活动应该实现的接口。您可以从片段中调用方法,这就像从活动中调用方法一样
在下面的示例中,第一个片段有一个按钮,单击该按钮时调用方法changeFragment(2),类似地,第二个片段调用方法changeFragment(1)。此方法在主活动中实施,并通过if。。否则,它将确定要替换的碎片
OnFragmentInteractionListener.java
片段a:
片段b:
主要活动:
希望能有帮助 不能理解:(你能不能让它像当你点击btn1时,它进入碎片一,当点击btn2时,它进入碎片二,一个if-else语句;请更具体一点我是新的:(谢谢
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="appnaturemedicine.com.example.posvoc.naturesmedicine.first">
<ImageView
android:layout_width="80dp"
android:layout_height="80dp"
android:id="@+id/imageView2"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:background="@mipmap/ic_launcher_cough" />
<Button
android:layout_width="80dp"
android:layout_height="30dp"
android:id="@+id/button"
android:layout_alignBottom="@+id/textView3"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:onClick="onButtonClicked"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Lagundi (Vitex negundo)"
android:id="@+id/textView3"
android:textColor="#ff4081"
android:layout_below="@+id/imageView3"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Honey"
android:id="@+id/textView4"
android:textColor="#ff4081"
android:layout_alignBottom="@+id/button3"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:layout_width="80dp"
android:layout_height="30dp"
android:id="@+id/button3"
android:layout_below="@+id/button"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Probiotics"
android:id="@+id/textView5"
android:layout_alignBottom="@+id/button4"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_toLeftOf="@+id/button4"
android:textColor="#ff4081"
android:layout_toStartOf="@+id/button4" />
<Button
android:layout_width="80dp"
android:layout_height="30dp"
android:id="@+id/button4"
android:layout_below="@+id/textView4"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<Button
android:layout_width="80dp"
android:layout_height="30dp"
android:id="@+id/button5"
android:layout_below="@+id/button4"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<Button
android:layout_width="80dp"
android:layout_height="30dp"
android:id="@+id/button6"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_below="@+id/button5" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Bromelain"
android:id="@+id/textView6"
android:textColor="#ff4081"
android:layout_alignBaseline="@+id/button5"
android:layout_alignBottom="@+id/button5"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Peppermint"
android:id="@+id/textView7"
android:textColor="#ff4081"
android:layout_alignBaseline="@+id/button6"
android:layout_alignBottom="@+id/button6"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ImageView
android:layout_width="250dp"
android:layout_height="110dp"
android:id="@+id/imageView3"
android:background="@drawable/ben"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* A simple {@link Fragment} subclass.
*/
public class first extends Fragment {
public first() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_first, container, false);
}
}
public interface OnFragmentInteractionListener {
public void changeFragment(int id);
}
public class first extends Fragment {
private OnFragmentInteractionListener mListener;
public first() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_first, container, false);
Button btn = (Button) view.findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mListener.changeFragment(2);
}
});
return view;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (OnFragmentInteractionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
}
public class first extends Fragment {
private OnFragmentInteractionListener mListener;
public first() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_first, container, false);
Button btn = (Button) view.findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mListener.changeFragment(1);
}
});
return view;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (OnFragmentInteractionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
}
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener, OnFragmentInteractionListener {
//Rest of the code
@Override
public void changeFragment(int id){
if (id == 1) {
fragment = new first();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.mainFrame, fragment);
ft.commit();
}
else if (id == 2) {
fragment = new second();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.mainFrame, fragment);
ft.commit();
}
}
}