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   源码介绍

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package qf.groupproject.com.presentsay;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.widget.FrameLayout;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

import com.facebook.drawee.backends.pipeline.Fresco;

import java.util.ArrayList;

import butterknife.Bind;
import butterknife.ButterKnife;
import cn.sharesdk.framework.ShareSDK;
import qf.groupproject.com.presentsay.fragments.CategoryFragment;
import qf.groupproject.com.presentsay.fragments.HomeFragment;
import qf.groupproject.com.presentsay.fragments.MineFragment;
import qf.groupproject.com.presentsay.fragments.TopFragment;

public class MainActivity extends AppCompatActivity {
    @Bind(R.id.flContainer)
    FrameLayout flContainer;
    @Bind(R.id.rbHome)
    RadioButton rbHome;
    @Bind(R.id.rbTop)
    RadioButton rbTop;
    @Bind(R.id.rbCategory)
    RadioButton rbCategory;
    @Bind(R.id.rbMine)
    RadioButton rbMine;
    @Bind(R.id.rgBottom)
    RadioGroup rgBottom;
    private FragmentManager supportFragmentManager;
    private HomeFragment homeFragment;
    private TopFragment topFragment;
    private CategoryFragment categoryFragment;
    private MineFragment mineFragment;
    private ArrayList<Fragment> fragments = new ArrayList<>();

    private Handler mainHandler = new Handler(Looper.getMainLooper()) {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case 1:
                    break;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        Fresco.initialize(this);
        ShareSDK.initSDK(this);
        supportFragmentManager = getSupportFragmentManager();
        initialFragments();
        initialRadioGroup();
//      初始化分享ShareSDk:
        ShareSDK.initSDK(this,"sharesdk的appkey");
    }



    private void initialFragments() {
        homeFragment = new HomeFragment();
        topFragment = new TopFragment();
        categoryFragment = new CategoryFragment();
        mineFragment = new MineFragment(this);

        fragments.add(homeFragment);
        fragments.add(topFragment);
        fragments.add(categoryFragment);
        fragments.add(mineFragment);

        showFragment(homeFragment);//默认显示的Fragment；
    }

    private void showFragment(Fragment fragment) {
        if (fragment != null) {
            FragmentTransaction fragmentTransaction = supportFragmentManager.beginTransaction();
            if (!fragment.isAdded()) {
                fragmentTransaction.add(R.id.flContainer, fragment);
            }
            for (Fragment f : fragments) {
                if (f != fragment && !f.isHidden()) {
                    fragmentTransaction.hide(f);
                }
            }
            fragmentTransaction.show(fragment);
            fragmentTransaction.commit();
        }

    }

    private void initialRadioGroup() {
        rbHome.setChecked(true);//默认显示第一个被选中；
        rgBottom.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch (checkedId) {
                    case R.id.rbHome:
                        showFragment(homeFragment);
                        break;
                    case R.id.rbTop:
                        showFragment(topFragment);
                        break;
                    case R.id.rbCategory:
                        showFragment(categoryFragment);
                        break;
                    case R.id.rbMine:
                        showFragment(mineFragment);
                        break;
                }

            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(resultCode == RESULT_OK){
            String result = data.getExtras().getString("result");
            Toast.makeText(this,result,Toast.LENGTH_SHORT).show();
        }

    }
}