assistant-android/app/src/main/java/com/gh/gamecenter/LibaoActivity.java

package com.gh.gamecenter;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.Fragment;
import android.support.v4.content.ContextCompat;
import android.support.v4.view.ViewPager;
import android.util.DisplayMetrics;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.gh.base.BaseActivity;
import com.gh.base.adapter.FragmentAdapter;
import com.gh.common.util.DisplayUtils;
import com.gh.common.util.EntranceUtils;
import com.gh.gamecenter.eventbus.EBReuse;
import com.gh.gamecenter.eventbus.EBUISwitch;
import com.gh.gamecenter.libao.Libao1Fragment;
import com.gh.gamecenter.libao.Libao2Fragment;
import com.gh.gamecenter.libao.Libao3Fragment;
import com.lightgame.view.NoScrollableViewPager;

import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;

import java.util.ArrayList;
import java.util.List;

import butterknife.BindView;
import butterknife.OnClick;

/**
 * Created by khy on 2016/12/12.
 */
public class LibaoActivity extends BaseActivity implements View.OnClickListener,
        ViewPager.OnPageChangeListener {

    public final static String EB_LIBAOACTIVITY_TAG = "LibaoActivity";
    @BindView(R.id.libao_vp_content)
    NoScrollableViewPager mLibaoVp;
    @BindView(R.id.libao_ll_top)
    LinearLayout mLibaoTopLl;
    @BindView(R.id.libao_slide_line)
    View mLibaoLine;
    @BindView(R.id.vp_tab)
    LinearLayout mTabLl;
    @BindView(R.id.libao_history_title)
    TextView mHistoryTitle;
    @BindView(R.id.libao_zuixun_tv)
    TextView mZuixinTv;
    @BindView(R.id.libao_concern_tv)
    TextView mGuanzhuTv;
    @BindView(R.id.libao_chunhaoxiang_tv)
    TextView mChunhaoxiangTv;
    private int currentItem;
    private int width;
    private LinearLayout.LayoutParams lparams;

    @NonNull
    public static Intent getIntent(Context context, String entrance) {
        Intent intent = new Intent(context, LibaoActivity.class);
        intent.putExtra(EntranceUtils.KEY_ENTRANCE, entrance);
        return intent;
    }

    @Override
    protected int getLayoutId() {
        return R.layout.activity_libao;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initTitle("礼包中心");

        mZuixinTv.setSelected(true);

        List<Fragment> list = new ArrayList<>();
        list.add(new Libao1Fragment());
        list.add(new Libao2Fragment());
        list.add(new Libao3Fragment());
        mLibaoVp.setAdapter(new FragmentAdapter(getSupportFragmentManager(), list));
        mLibaoVp.addOnPageChangeListener(this);

        DisplayMetrics outMetrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(outMetrics);
        width = outMetrics.widthPixels / 3;
        lparams = new LinearLayout.LayoutParams(width / 2,
                DisplayUtils.dip2px(this, 2));
        lparams.leftMargin = (int) (width * (currentItem + 0.25f));
        mLibaoLine.setLayoutParams(lparams);

        mLibaoTopLl.postDelayed(new Runnable() {
            @Override
            public void run() {
                EventBus.getDefault().post(new EBUISwitch(EB_LIBAOACTIVITY_TAG, 0));
            }
        }, 100);

    }

    @OnClick({R.id.libao_zuixun_tv, R.id.libao_concern_tv, R.id.libao_chunhaoxiang_tv})
    public void onClick(View v) {
        if (v == mZuixinTv) {
            mLibaoVp.setCurrentItem(0);
        } else if (v == mGuanzhuTv) {
            mLibaoVp.setCurrentItem(1);
        } else if (v == mChunhaoxiangTv) {
            mLibaoVp.setCurrentItem(2);
        }
    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        if (positionOffset != 0) {
            lparams.leftMargin = (int) (width * (position + positionOffset + 0.25f));
            mLibaoLine.setLayoutParams(lparams);
        } else {
            if (currentItem != mLibaoVp.getCurrentItem()) {
                currentItem = mLibaoVp.getCurrentItem();
                EventBus.getDefault().post(new EBUISwitch(EB_LIBAOACTIVITY_TAG, currentItem));
            }
        }
    }

    @Override
    public void onPageSelected(int position) {
        if (position == 0) {
            mZuixinTv.setSelected(true);
            mGuanzhuTv.setSelected(false);
            mChunhaoxiangTv.setSelected(false);
        } else if (position == 1) {
            mZuixinTv.setSelected(false);
            mGuanzhuTv.setSelected(true);
            mChunhaoxiangTv.setSelected(false);
        } else if (position == 2) {
            mZuixinTv.setSelected(false);
            mGuanzhuTv.setSelected(false);
            mChunhaoxiangTv.setSelected(true);
        }
    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }

    // 页面切换事件（查看历史礼包的页面）
    @Subscribe(threadMode = ThreadMode.MAIN)
    public void onEventMainThread(EBReuse reuse) {
        if ("openPage".equals(reuse.getType())) {
            mLibaoTopLl.setVisibility(View.GONE);
            mLibaoLine.setVisibility(View.GONE);
            mHistoryTitle.setVisibility(View.VISIBLE);
            mHistoryTitle.setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.hint));
            mLibaoVp.setScrollable(false);
        } else if ("closePage".equals(reuse.getType())) {
            mLibaoTopLl.setVisibility(View.VISIBLE);
            mLibaoLine.setVisibility(View.VISIBLE);
            mHistoryTitle.setVisibility(View.GONE);
            mLibaoVp.setScrollable(true);
        }
    }
}