Android初学第96天

Android初学第96天

31_TouchEvents

代码

DragAndDraw

Box.java

package com.bignerdranch.android.draganddraw;

import android.graphics.PointF;

public class Box {
    private PointF mOrigin;
    private PointF mCurrent;

    public Box(PointF origin) {
        mOrigin = origin;
        mCurrent = origin;
    }

    public PointF getCurrent() {
        return mCurrent;
    }

    public void setCurrent(PointF current) {
        mCurrent = current;
    }

    public PointF getOrigin() {
        return mOrigin;
    }
}

SingleFragmentActivity.java

package com.bignerdranch.android.draganddraw;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;

public abstract class SingleFragmentActivity extends AppCompatActivity {

    protected abstract Fragment createFragment();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fragment);

        FragmentManager fm = getSupportFragmentManager();
        Fragment fragment = fm.findFragmentById(R.id.fragment_container);

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