Tempalte of Fragment Creating

!SingleFragmentActivity

collection head

0.SingleFragmentActivity.java

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Toast;

import com.zhy.autolayout.AutoLayoutActivity;

/**
 * Created by MartinRGB on 2017/8/31.
 */

public abstract class SingleFragmentActivity extends AutoLayoutActivity{
    //Abstarct Mehotd
    protected  abstract Fragment createFragment();

    //Life Cycle
    @Override
    public void onCreate(Bundle savedInstance){
        super.onCreate(savedInstance);
        deleteBars();
        setContentView(R.layout.activity_main);
        addFragment();
    }

    //Add Fragment
    private void addFragment(){
        FragmentManager fragmentManager = getSupportFragmentManager();
        Fragment fragment = fragmentManager.findFragmentById(R.id.fragment_container);

        if(fragment == null){
            fragment = createFragment();
            fragmentManager.beginTransaction()
                    .add(R.id.fragment_container,fragment)
                    .commit();
        }
    }

    ////################### Delete ###################
    private void deleteBars(){
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    }

    ////################### Onfocus Nav Bar ###################
    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        getWindow().getDecorView().setSystemUiVisibility(
                View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                        | View.SYSTEM_UI_FLAG_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
    }


}

1.MainActivity.java

import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;


public class MainActivity extends SingleFragmentActivity{

    private MultiTaskFragment thisFragment;
    @Override
    public void onCreate(Bundle savedInstance){
        super.onCreate(savedInstance);

    }
    @Override
    protected android.support.v4.app.Fragment createFragment() {
        thisFragment = MultiTaskFragment.newInstance();
        return thisFragment;
    }

    //################### Key Utils ###################
    public void onBackPressed(){
        Intent intent = getIntent();
        finish();
        startActivity(intent);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN ) {
            thisFragment.myOnKeyDown(keyCode);
        }
        if (keyCode == KeyEvent.KEYCODE_VOLUME_UP ) {
            thisFragment.myOnKeyDown(keyCode);
        }
        return super.onKeyDown(keyCode, event);
    }

}

2.CustomFragment.java

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

/**
 * Created by MartinRGB on 2017/8/31.
 */

public class CustomFragment extends Fragment {

    private static final String TAG = "MultiTaskFragment";

    public static CustomFragment newInstance() {
        return new CustomFragment();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstance) {
        View view = inflater.inflate(R.layout.fragment_container, container, false);
        return view;
    }

    @Override
    public void onCreate(Bundle savedInstancestate) {
        super.onCreate(savedInstancestate);

    }

    @Override
    public void onPause() {
        super.onPause();
    }

    @Override
    public void onResume() {
        super.onResume();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
    }


    public void myOnKeyDown(int key_code) {
        //do whatever you want here

        if ((key_code == KeyEvent.KEYCODE_VOLUME_DOWN)) {
            Log.e(TAG,"KEYCODE_VOLUME_DOWN");
        }

        if ((key_code == KeyEvent.KEYCODE_VOLUME_UP)) {
            Log.e(TAG,"KEYCODE_VOLUME_UP");
        }
    }


}