Question

我正在尝试制作具有滑动导航类型的应用。这就是我走了多远：

片段活动：

package com.app.BoomBase;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment_control extends Fragment {

String tag = this.getClass().getSimpleName();
@Override
public void onCreate(Bundle savedInstanceState) {
    Log.i(tag, "onCreate");
    super.onCreate(savedInstanceState);
    /** Getting the arguments to the Bundle object */
    Bundle data = getArguments();

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    Log.i(tag, "onCreateView");

    View view = inflater.inflate(R.layout.fragment_controle,container, false ); 

    return view;
  }

  }

FragmentPageAdapter：

package com.app.BoomBase;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

  public class Fragment_Pager extends FragmentPagerAdapter {

final int PAGE_COUNT = 3;
public Fragment_Pager(FragmentManager fm) {
    super(fm);
    // TODO Auto-generated constructor stub
}

@Override
public Fragment getItem(int arg0) {

    Fragment_control myFragment = new Fragment_control();
    Bundle data = new Bundle();
    data.putInt("current_page", arg0+1);
    myFragment.setArguments(data);
    return myFragment;

}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return PAGE_COUNT;
}

}

MainActivity：

package com.app.BoomBase;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.Menu;

public class MainActivity extends FragmentActivity {

String tag = this.getClass().getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
    Log.i(tag, "onCreate");
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    /** Getting a reference to the ViewPager defined the layout file */
    ViewPager pager = (ViewPager) findViewById(R.id.pager);

    /** Getting fragment manager */
    FragmentManager fm = getSupportFragmentManager();

    /** Instantiating FragmentPagerAdapter */
    Fragment_Pager pagerAdapter = new Fragment_Pager(fm);

    /** Setting the pagerAdapter to the pager object */
    pager.setAdapter(pagerAdapter);

}
}

但我的问题是我无法弄清楚如何在代码中添加片段。我想用按钮和东西刷到下一个活动。我怎么做？

Answer 1

PageAdapter使用您的getItem()在Fragments之间切换，您可以在此处声明哪个页面可以执行哪些操作。 “位置”0是第一页，1是第二页，依此类推。您可以根据需要返回其他Fragments的新实例或传递参数。

例如：

@Override
public Fragment getItem(int position) {
    switch (position) {
    case 0:
        // Your current main fragment showing how to send arguments to fragment
        Fragment_control myFragment = new Fragment_control();
        Bundle data = new Bundle();
        data.putInt("current_page", position+1);
        myFragment.setArguments(data);
        return myFragment;
    case 1:
        // Calling a Fragment without sending arguments
        return new MySecondFragment();
    case 2:
        return new MyThirdFragment();
    default:
        return null;
    }
}

然后，您将为每个要合并的人创建一个Fragment类。在我的示例中，您将拥有MySecondFragment和MyThirdFragment

的课程

public class MySecondFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.second_fragment, null); 
        return view;
    }

}

和

public class MyThirdFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.third_fragment, null); 
        return view;
    }

}

任何片段都可能只是夸大标准的xml布局文件，为了访问布局中的孩子，你必须记住使用以下内容，我将以MySecondFragment为例。

假设您在标题为“second_fragment”的布局文件中有两个Buttons，ID为R.id.button1和R.id.button2：

public class MySecondFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.second_fragment, null);

        // Make sure to add the parent inflater before and layout child call
        Button btn_one = (Button)view.findViewById(R.id.button1);
        Button btn_two = (Button)view.findViewById(R.id.button2);

        return view;
    }

}

修改

要从0以外的页面或第一个位置开始，您只需在setCurrentItem()中使用MainAvticity，就像这样：

@Override protected void onCreate(Bundle savedInstanceState) { Log.i(tag, "onCreate"); super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ViewPager pager = (ViewPager) findViewById(R.id.pager); FragmentManager fm = getSupportFragmentManager(); Fragment_Pager pagerAdapter = new Fragment_Pager(fm); // Here you would declare which page to visit on creation pager.setAdapter(pagerAdapter); pager.setCurrentItem(1); }

Answer 2

我在片段类中添加了这个..

我得到的问题是无法解决无法解决获取支持片段管理器（）。

@Override
protected void onCreate(Bundle savedInstanceState) {
Log.i(tag, "onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

ViewPager pager = (ViewPager) findViewById(R.id.pager);
FragmentManager fm = getSupportFragmentManager();
Fragment_Pager pagerAdapter = new Fragment_Pager(fm);
// Here you would declare which page to visit on creation
pager.setAdapter(pagerAdapter);
pager.setCurrentItem(1);

}

Android使用不带标签的ViewPager轻扫

2 个答案: