Java 如何显示其他布局?
我是android开发的新手,我只是想一路学习 我正在创建一个android应用程序,我想显示不同的视图,一个是体重、天气和水合作用(我现在称之为体重、天气和水合作用)。虽然当我运行我的应用程序时,我只显示一个视图 为了在选项卡式视图中显示其他两个布局,我必须添加/修改哪些代码 这是我在MainActivity.java中的代码Java 如何显示其他布局?,java,android,Java,Android,我是android开发的新手,我只是想一路学习 我正在创建一个android应用程序,我想显示不同的视图,一个是体重、天气和水合作用(我现在称之为体重、天气和水合作用)。虽然当我运行我的应用程序时,我只显示一个视图 为了在选项卡式视图中显示其他两个布局,我必须添加/修改哪些代码 这是我在MainActivity.java中的代码 package com.oxinc.android.drate; import android.support.design.widget.TabLayout
package com.oxinc.android.drate;
import android.support.design.widget.TabLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
int quantity = 0;
String outcome = "";
int required = 0;
int height = 0;
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
//Tabbed Layout
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
//Floating Action Button
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Are you hydrated?", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
@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);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
public static PlaceholderFragment fragment_main() {
PlaceholderFragment fragment = new PlaceholderFragment();
return fragment;
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment weight(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View hydration = inflater.inflate(R.layout.hydration, container, false);
return hydration;
}
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.weight(position + 1);
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Hydration";
case 1:
return "Weigh In";
case 2:
return "Weather";
}
return null;
}
}
public void eight(View view) {
quantity = quantity + 8;
displayQuantity(quantity);
}
public void twelve(View view) {
quantity = quantity + 12;
displayQuantity(quantity);
}
public void sixteen(View view) {
quantity = quantity + 16;
displayQuantity(quantity);
}
public void thirty_two(View view) {
quantity = quantity + 32;
displayQuantity(quantity);
}
public void sixty_four(View view) {
quantity = quantity + 64;
displayQuantity(quantity);
}
//Reset Button
public void reset(View view) {
quantity = 0;
displayQuantity(quantity);
outcome = "";
displayOutcome(outcome);
}
//Starts the basic formula for oz. per day
public int height(int value) {
EditText height = (EditText) findViewById(R.id.height);
String height_value = height.getText().toString();
int int_height = Integer.parseInt(height_value);
if (int_height >= 60) {
required = 64;
}
return required;
}
/**
* This method is called when the check button is clicked.
*/
public String check(View view) {
height((int) height);
if (quantity >= required) {
outcome = "You have met your goal!!";
} else {
outcome = "Keep trying you are almost there";
}
displayOutcome(outcome);
return outcome;
}
//Displays the Outcome to the outcome text view
public void displayOutcome(String n) {
TextView outcomeTextView = (TextView) findViewById(
R.id.outcome_text_view);
outcomeTextView.setText(outcome);
}
/**
* This method displays the given quantity value on the screen.
*/
public void displayQuantity(int quantity) {
TextView quantityTextView = (TextView) findViewById(
R.id.quantity_text_view);
quantityTextView.setText(quantity + "");
}
}
一次我运行它,我只得到三个屏幕,看起来像这样
在您的
公共片段getItem(int位置){
在您的
公共类节SpagerAdapter扩展了FragmentPagerAdapter{
实施这一点:
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new fragment1();
case 1:
return new fragment2();
case 2:
return new fragment3();
default:
// this should never happen
return null;
//return new Fragment();
}
}
其中“fragment1-2和3”是您定义在那里运行的java类的名称
我的“getItem”就是这样使用的,里面没有其他东西。所以我不知道你是否需要在那里维护你的return PlaceholderFragment.weight(position+1);
。试着注释一下,看看会发生什么。我也不使用createview。最好的。问题就在这里
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View hydration = inflater.inflate(R.layout.hydration, container, false);
return hydration;
}
你总是在膨胀水合布局,在每个片段中你是说三个选项卡显示相同的内容吗?@statosdotcom是的,所有三个选项卡显示完全相同的视图,我如何创建三个单独的视图?谢谢你,这起作用了,我删除了返回占位符片段。权重(位置+1);这是Android StudioThank you Fidel_Willis生成的起始代码。正如Sampaio所说,也可以查看createview。这真的会导致不可预测的行为。继续吧,伙计。我希望我能投票支持你的答案,但我没有足够的代表性。我很高兴!不要害怕,你已经有了很多知识,从y的水平来看我们的帖子和对这种情况的快速处理。为了提高你的声誉,这只是时间问题。你根本不欠我什么,我已经得到了我想要的:帮助人们,获得一些分数。你还有很长的路要走。要想一想。我相信你,你将来会帮助很多人。上帝保佑。这个应用程序在不使用整个cl的情况下还能工作吗屁股?我能把整件事都删掉吗?