MainActivity.java

package com.atguigu.mobileplayer1020;

import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.hardware.Sensor;
import android.hardware.SensorManager;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.RadioGroup;

import com.atguigu.mobileplayer1020.base.BaseFragment;
import com.atguigu.mobileplayer1020.fragment.LocalAudioFragment;
import com.atguigu.mobileplayer1020.fragment.LocalVideoFragment;
import com.atguigu.mobileplayer1020.fragment.NetAudioFragment;
import com.atguigu.mobileplayer1020.fragment.NetVideoFragment;
import com.atguigu.mobileplayer1020.fragment.RecyclerViewFragment;

import java.util.ArrayList;

import fm.jiecao.jcvideoplayer_lib.JCVideoPlayer;

public class MainActivity extends AppCompatActivity {

    private RadioGroup rg_main;
    private ArrayList<BaseFragment> fragments;

    /**
     * Fragment页面的下标位置
     */
    private int position;

    /**
     * 缓存的Fragment
     */
    private Fragment tempFragment;
    /**
     *
     */
    private SensorManager sensorManager;
    private JCVideoPlayer.JCAutoFullscreenListener sensorEventListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.e("TAG","onCreate");
        setContentView(R.layout.activity_main);
        rg_main = (RadioGroup) findViewById(R.id.rg_main);

        //Android6.0动态获取权限
        isGrantExternalRW(this);

        initFragment();

        //设置RadioGroup的监听
        initListenter();

        sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        sensorEventListener = new JCVideoPlayer.JCAutoFullscreenListener();

    }

    private void initListenter() {
        //设置RadioGroup选中状态变化的监听
        rg_main.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch (checkedId) {
                    case R.id.rb_local_video:
                        position = 0;
                        break;
                    case R.id.rb_local_audio:
                        position = 1;
                        break;
                    case R.id.rb_net_audio:
                        position = 2;
                        break;
                    case R.id.rb_net_video:
                        position = 3;
                        break;
                    case R.id.rb_recyclerview:
                        position = 4;
                        break;
                }

                //Fragment-当前的Fragment
                Fragment currentFragment = fragments.get(position);
                switchFragment(currentFragment);
            }
        });

        //默认选中本地视频
        rg_main.check(R.id.rb_local_video);//onCheckedChanged
    }




    private void switchFragment(Fragment currentFragment) {
        if (tempFragment != currentFragment) {

            //开启事务
            FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
            //切换
            if (currentFragment != null) {
                //是否添加过
                if (!currentFragment.isAdded()) {

                    //把之前显示的给隐藏
                    if (tempFragment != null) {
                        ft.hide(tempFragment);
                    }
                    //如果没有添加就添加
                    ft.add(R.id.fl_mainc_content, currentFragment);

                } else {

                    //把之前的隐藏
                    if (tempFragment != null) {
                        ft.hide(tempFragment);
                    }
                    //如果添加了就直接显示
                    ft.show(currentFragment);

                }

                //最后一步，提交事务
                ft.commit();

            }
            tempFragment = currentFragment;

        }



    }

    /**
     * 初始化Fragment
     * 有先后顺序要求
     */
    private void initFragment() {
        fragments = new ArrayList<>();
        fragments.add(new LocalVideoFragment());//本地视频
        fragments.add(new LocalAudioFragment());//本地音乐
        fragments.add(new NetAudioFragment());//网络音乐
        fragments.add(new NetVideoFragment());//网络视频
        fragments.add(new RecyclerViewFragment());//RecyclerView

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.e("TAG","onDestroy");
    }


    /**
     * 解决安卓6.0以上版本不能读取外部存储权限的问题
     * @param activity
     * @return
     */
    public static boolean isGrantExternalRW(Activity activity) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && activity.checkSelfPermission(
                Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {

            activity.requestPermissions(new String[]{
                    Manifest.permission.READ_EXTERNAL_STORAGE,
                    Manifest.permission.WRITE_EXTERNAL_STORAGE
            }, 1);

            return false;
        }

        return true;
    }


//    private boolean isExit = false;
//
//    @Override
//    public boolean onKeyDown(int keyCode, KeyEvent event) {
//        if(keyCode ==KeyEvent.KEYCODE_BACK){
//            if(position !=0){
//                //选中首页
//                rg_main.check(R.id.rb_local_video);
//                return true;
//            }else if(!isExit){
//                isExit = true;
//                Toast.makeText(this, "再按一次推出", Toast.LENGTH_SHORT).show();
//                new Handler().postDelayed(new Runnable() {
//                    @Override
//                    public void run() {
//                        isExit = false;
//                    }
//                }, 2000);
//                return true;
//            }
//        }
//        return super.onKeyDown(keyCode, event);
//    }


    @Override
    protected void onResume() {
        super.onResume();
        //监听传感器
        Sensor accelerometerSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        sensorManager.registerListener(sensorEventListener, accelerometerSensor, SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override
    protected void onPause() {
        super.onPause();
        //取消注册
        sensorManager.unregisterListener(sensorEventListener);
        JCVideoPlayer.releaseAllVideos();
    }


    @Override
    public void onBackPressed() {
        if (JCVideoPlayer.backPress()) {
            return;
        }
        super.onBackPressed();
    }
}