Activityのツールクラス

import android.os.Bundle;
import android.os.PersistableBundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Toast;

/**
 * Created by e531 on 2017/10/17.
 */
public abstract class BaseActivity extends AppCompatActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d("zzz","base:onCreate");
        // 
        setContentView(getLayout());

        initView();

        setListener();

        initData();

    }

    // id
    public  abstract int getLayout();

    // 
    public abstract void initView();
    // 
    public abstract void setListener();
    // 
    public abstract void initData();
    // 
    public void getToast(String tip){
        Toast.makeText(BaseActivity.this, tip, Toast.LENGTH_SHORT).show();
    }
}