java - Android fragment 事务动画在 View 寻呼机上不起作用

Question

我使用 ViewPager 和 Fragments 创建一个 Android 应用程序。在这里，我使用 FragmentTransaction 使用按钮操作在彼此之间滑动 fragment 。我还使用了一种在 fragment 之间移动的方法。它位于 MainActivity 类中。

这是MainActivity类，

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;

public class MainActivity extends FragmentActivity {

    private ViewPager viewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        viewPager=(ViewPager)findViewById(R.id.viewPager);
        viewPager.setAdapter(new MyPagerAdapter2(getSupportFragmentManager()));
        viewPager.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if (viewPager.getCurrentItem() == 0) {
                    return true;
                }

                if (viewPager.getCurrentItem() == 1) {
                    return true;
                }

                if (viewPager.getCurrentItem() == 2) {
                    return true;
                }

                if (viewPager.getCurrentItem() == 3) {
                    return true;
                }

                if (viewPager.getCurrentItem() == 4) {
                    return true;
                }

                return false;
            }
        });



    }

    private class MyPagerAdapter2 extends FragmentPagerAdapter {

        public MyPagerAdapter2(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int pos) {
            switch(pos) {

                case 0: return FirstFragment1.newInstance("FirstFragment_1");
                case 1: return SecondFragment1.newInstance("SecondFragment_1");
                case 2: return ThirdFragment1.newInstance("ThirdFragment_1");
                case 3: return FourthFragment1.newInstance("FourthFragment_1");
                case 4: return FifthFragment1.newInstance("FifthFragment_1");
                default: return FirstFragment1.newInstance("DefaultFragment_1");
            }
        }

        @Override
        public int getCount() {
            return 5;
        }
    }

    public void setCurrentItem(int which) {
        if(viewPager != null && which >= 0 && which <= 4) {
            viewPager.setCurrentItem(which);
        }
    }
}

这是用于我的目的的示例代码，

import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

/**
 * Created by user on 5/11/2016.
 */
public class SecondFragment1 extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.second_frag_1, container, false);

        TextView tv = (TextView) v.findViewById(R.id.tvFragSecond);
        tv.setText(getArguments().getString("msg"));


        Button button=(Button)v.findViewById(R.id.printButton);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if(getActivity() != null) {

                    FragmentManager fragmentManager=getActivity().getSupportFragmentManager();
                    FragmentTransaction transaction = fragmentManager.beginTransaction();
                    transaction.setCustomAnimations(R.anim.from_right, R.anim.to_left);
                    FirstFragment1 firstFragment1=FirstFragment1.newInstance("Fragment Main");
                    transaction.replace(R.id.firstFragment, firstFragment1, "first_fragment");
                    transaction.commit();

                    ( (MainActivity)getActivity()).setCurrentItem(0);
                }

            }
        });

        Button button1=(Button)v.findViewById(R.id.nextButton);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (getActivity() != null) {
                    ( (MainActivity)getActivity()).setCurrentItem(2); // fourth fragment index is 3
                }
            }
        });

        return v;
    }

    public static SecondFragment1 newInstance(String text) {

        SecondFragment1 f = new SecondFragment1();
        Bundle b = new Bundle();
        b.putString("msg", text);

        f.setArguments(b);

        return f;
    }

    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        if(isVisibleToUser) {
            Activity a = getActivity();
            if(a != null) a.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);
        }
    }

}

这些是我的动画文件，

from_left.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:shareInterpolator="false">
    <translate
        android:fromXDelta="-100%" android:toXDelta="0%"
        android:fromYDelta="0%" android:toYDelta="0%"
        android:duration="500"/>
</set>

from_right.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:shareInterpolator="false">
    <translate
        android:fromXDelta="100%" android:toXDelta="0%"
        android:fromYDelta="0%" android:toYDelta="0%"
        android:duration="500" />
</set>

to_left.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:shareInterpolator="false">
    <translate
        android:fromXDelta="0%" android:toXDelta="-100%"
        android:fromYDelta="0%" android:toYDelta="0%"
        android:duration="500"/>
</set>

to_right.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:shareInterpolator="false">
    <translate
        android:fromXDelta="0%" android:toXDelta="100%"
        android:fromYDelta="0%" android:toYDelta="0%"
        android:duration="500" />
</set>

问题:- 当使用此动画文件在 fragment 之间切换时不起作用。

当我单击 SecondFragment1 中的按钮时，第 0 个 fragment 应从右到左方向加载到 ViewPager 。但是，这里的过程有所不同。首先，第 0 个 fragment 从左到右方向加载到 ViewPager，然后再次从右到左方向加载。

我的目的是从一开始就从右到左方向将第 0 个 fragment 加载到 ViewPager 中。

我怎样才能得到正确的 View ？有什么想法吗？

深深感谢。

Answer 1

根据我对问题的理解，您只想在按下按钮时替换 fragment ？因此，首先我将删除 View 寻呼机并将其替换为 FrameLayout。

在类顶部声明框架布局:

FrameLayout fl_frag_container = (FrameLayout) findViewById(R.id.fl_frag_container);

然后在 MainActivity 中创建一个方法，您可以从 fragment 调用来更改正在显示的 fragment :

就我而言，我使用:

public void setSecondaryFrag(int page, String name, String url, String id) {
    transaction = fragMan.beginTransaction();
    switch (page) {
        case Constants.VIEW_EVENTS:
            transaction.replace(fl_frag_container.getId(), new ViewEventsFragment());
            break;
        case Constants.VIEW_ARTIST_PROFILE:
            transaction.replace(fl_frag_container.getId(), BrandArtistProfileFragment.newInstance(Constants.ARTISTS, name, url, id));
            break;
        case Constants.VIEW_BRAND_PROFILE:
            transaction.replace(fl_frag_container.getId(), BrandArtistProfileFragment.newInstance(Constants.BRANDS,name, url, id) );
            break;
        case Constants.VIEW_TICKETS:
            transaction.replace(fl_frag_container.getId(), new ViewTicketFragment());
            break;

    }
    transaction.addToBackStack(null);
    transaction.setCustomAnimations(R.anim.from_right, R.anim.to_left);
    transaction.commitAllowingStateLoss();
}

然后在我要调用的 fragment 中

((MainActivity) getActivity).setSecondaryFrag(page, "", "", "");

可以根据您的需要进行修改

使用框架布局替换 fragment 无需使用 View 页面适配器

希望这有帮助