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我在尋求關於片段的幫助。我的活動和底部導航中顯示了3個片段。我有一個按鈕底部導航與命令打開另一個活動，我已經宣佈ImageViews（我也可以使用gridview ..）。我想要的是通過單擊ImageView將一個片段添加到我的主要活動中。我已經宣佈了一個片段，它已準備好使用。在我的MainActivity.java中，我的代碼顯示了我想顯示的頁數（片段選項卡） - 覆蓋public int getCount（）{return 3} - 顯示3頁，當我將其更改爲4時，第四個片段將被顯示。感謝您的答案和一些幫助！如何從其他活動添加片段選項卡
// //編輯我添加每個活動的代碼更好地瞭解點擊bottomnav稱爲
MainActivity.java
package com.example.mp.mmfinal2;
import android.app.Activity;
import android.content.Intent;
import android.media.Image;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.design.internal.NavigationMenuItemView;
import android.support.design.widget.BottomNavigationView;
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.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
static final int TRY_ADD_RESULT = 1;
protected Integer display_num;
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_fullscreen:
Intent intent4=new Intent(MainActivity.this, Main2Activity.class);
startActivity(intent4);
return true;
case R.id.navigation_home:
Intent intent5=new Intent(MainActivity.this, MainActivity.class);
startActivity(intent5);
return true;
case R.id.navigation_add:
Intent intent9=new Intent(MainActivity.this, TryAdd.class);
startActivityForResult(intent9, TRY_ADD_RESULT);
return true;
}
return false;
}
};
@Override
protected void onActivityResult(TRY_ADD_RESULT requestCode, int resultCode, Intent data) {
if (requestCode == IMAGE_CLICK_RESULT) {
if(resultCode == Activity.RESULT_OK){
Integer result=data.getIntExtra("result");
display_num = result;
mSectionsPagerAdapter.notifyDataSetChanged();
}
}
}
/**
* 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);
display_num = 3;
// 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);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
}
/**
* 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) {
switch (position){
case 0:
Novtab tab1 = new Novtab();
return tab1;
case 1:
Hostab tab2 = new Hostab();
return tab2;
case 2:
Idntab tab3 = new Idntab();
return tab3;
case 3:
Fortab tab4 = new Fortab();
return tab4;
default:
return null;
}
}
@Override
public int getCount() {
return display_num;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Google";
case 1:
return "Seznam";
case 2:
return "Stranka";
case 3:
return "whatever";
}
return null;
}
}
}
TryAdd.java（第二項活動。 item）
package com.example.mp.mmfinal2;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.os.Handler;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
/**
* An example full-screen activity that shows and hides the system UI (i.e.
* status bar and navigation/system bar) with user interaction.
*/
public class TryAdd extends AppCompatActivity {
/**
* Whether or not the system UI should be auto-hidden after
* {@link #AUTO_HIDE_DELAY_MILLIS} milliseconds.
*/
private static final boolean AUTO_HIDE = true;
/**
* If {@link #AUTO_HIDE} is set, the number of milliseconds to wait after
* user interaction before hiding the system UI.
*/
private static final int AUTO_HIDE_DELAY_MILLIS = 3000;
/**
* Some older devices needs a small delay between UI widget updates
* and a change of the status and navigation bar.
*/
private static final int UI_ANIMATION_DELAY = 300;
private final Handler mHideHandler = new Handler();
private View mContentView;
private final Runnable mHidePart2Runnable = new Runnable() {
@SuppressLint("InlinedApi")
@Override
public void run() {
// Delayed removal of status and navigation bar
// Note that some of these constants are new as of API 16 (Jelly Bean)
// and API 19 (KitKat). It is safe to use them, as they are inlined
// at compile-time and do nothing on earlier devices.
mContentView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE
| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
}
};
private View mControlsView;
private final Runnable mShowPart2Runnable = new Runnable() {
@Override
public void run() {
// Delayed display of UI elements
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.show();
}
mControlsView.setVisibility(View.VISIBLE);
}
};
private boolean mVisible;
private final Runnable mHideRunnable = new Runnable() {
@Override
public void run() {
hide();
}
};
/**
* Touch listener to use for in-layout UI controls to delay hiding the
* system UI. This is to prevent the jarring behavior of controls going away
* while interacting with activity UI.
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_try_add);
mVisible = true;
mControlsView = findViewById(R.id.fullscreen_content_controls);
mContentView = findViewById(R.id.fullscreen_content);
// Set up the user interaction to manually show or hide the system UI.
mContentView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
toggle();
}
});
// Upon interacting with UI controls, delay any scheduled hide()
// operations to prevent the jarring behavior of controls going away
// while interacting with the UI.
ImageView imview3 = (ImageView) findViewById(R.id.imageView3);
imview3.setClickable(true);
imview3.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
Intent data = new Intent();
data.putExtra("result", 4);
setResult(RESULT_OK, data);
finish();
}
});
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Trigger the initial hide() shortly after the activity has been
// created, to briefly hint to the user that UI controls
// are available.
delayedHide(100);
}
private void toggle() {
if (mVisible) {
hide();
} else {
show();
}
}
private void hide() {
// Hide UI first
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.hide();
}
mControlsView.setVisibility(View.GONE);
mVisible = false;
// Schedule a runnable to remove the status and navigation bar after a delay
mHideHandler.removeCallbacks(mShowPart2Runnable);
mHideHandler.postDelayed(mHidePart2Runnable, UI_ANIMATION_DELAY);
}
@SuppressLint("InlinedApi")
private void show() {
// Show the system bar
mContentView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION);
mVisible = true;
// Schedule a runnable to display UI elements after a delay
mHideHandler.removeCallbacks(mHidePart2Runnable);
mHideHandler.postDelayed(mShowPart2Runnable, UI_ANIMATION_DELAY);
}
/**
* Schedules a call to hide() in [delay] milliseconds, canceling any
* previously scheduled calls.
*/
private void delayedHide(int delayMillis) {
mHideHandler.removeCallbacks(mHideRunnable);
mHideHandler.postDelayed(mHideRunnable, delayMillis);
}
}
gridempty.java
package com.example.mp.mmfinal2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
public class gridempty extends AppCompatActivity {
GridView gridView;
String[] values = {
"Stranka1",
"Stranka 2"
} ;
int[] images = {
R.drawable.add,
R.drawable.home
} ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gridempty);
gridView = (GridView) findViewById(R.id.griView);
GridAdapter gridAdapter = new GridAdapter(this, values, images);
gridView.setAdapter(gridAdapter);
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
});
}
}
GridAdapter
package com.example.mp.mmfinal2;
import android.content.Context;
import android.text.Layout;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
/**
* Created by mp on 06.09.2017.
*/
public class GridAdapter extends BaseAdapter {
Context context;
private final String [] values;
private final int [] images;
View view;
LayoutInflater layoutInflater;
public GridAdapter(Context context, String[] values, int[] images) {
this.context = context;
this.values = values;
this.images = images;
}
@Override
public int getCount() {
return values.length;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if(convertView == null){
view = new View(context);
view = layoutInflater.inflate(R.layout.single_item, null);
ImageView imageView = (ImageView) view.findViewById(R.id.imageview);
TextView textview = (TextView) view.findViewById(R.id.textview);
imageView.setImageResource(images[position]);
textview.setText(values[position]);
}
return view;
}
}
感謝您的建議，我試過了，但我不知道正確的代碼要寫，我沒有關於android studio的那麼大的知識和java，我在2周前開始編寫應用程序：D，感謝您的回答，我將代碼添加到上面的問題中，如果您還有時間幫忙，我會很感激！ –