Android为什么会有MVP呢?

概述在Android中的默认架构模式就MVC,但是为什么会有MVP呢?主要原因是内存泄漏,接下来我们就一起来分析MVC在内存中的泄漏情况首先我们把MVC的代码写好 进行测试案例是一个简单的获取图片的demopublicclassMainActivityextendsActivityimplementsCallback{private 在AndroID中的默认架构模式就MVC,但是为什么会有MVP呢?主要原因是内存泄漏,接下来我们就一起来分析MVC在内存中的泄漏情况

首先我们把MVC的代码写好  进行测试 案例是一个简单的获取图片的demo

public class MainActivity extends Activity implements Callback {    private ImageVIEw imageVIEw;    private final static String PATH = "https://imgconvert.csdnimg.cn/aHR0cHM6Ly9mb3J1bS5taWFuYmFvYmFulmNul2RhdGEvYXR0YWNobWVudC9mb3J1bS8yMDE4MDMvMjAvMTQwMTUzaTc1NjJleHpqcm5hZ2FqYS5naWY";    private Handler handler = new Handler(new Handler.Callback() {        @OverrIDe        public boolean handleMessage(Message msg) {            switch (msg.what) {                case ImageDownloader.SUCCESS: // 成功                    imageVIEw.setimageBitmap((Bitmap) msg.obj);                    break;                case ImageDownloader.ERROR: // 失败                    Toast.makeText(MainActivity.this, "下载失败", Toast.LENGTH_SHORT).show();                    break;            }            return false;        }    });    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);        imageVIEw = findVIEwByID(R.ID.iv_image);        // 内存泄漏        new Thread(new Runnable() {            @OverrIDe            public voID run() {                SystemClock.sleep(50000);            }        }).start();    }    // 点击事件    public voID getimage(VIEw vIEw) {        ImageBean imageBean = new ImageBean();        imageBean.setRequestPath(PATH);        new ImageDownloader().down(this, imageBean);    }    @OverrIDe    public voID callback(int resultCode, ImageBean imageBean) {        Message message = handler.obtainMessage(resultCode);        message.obj = imageBean.getBitmap();        handler.sendMessageDelayed(message, 500);    }}

public interface Callback {    /**     * @param resultCode 请求结果返回标识码     * @param imageBean Model层数据中bitmap对象（用于C层刷新V）     */    voID callback(int resultCode, ImageBean imageBean);}

public class ImageBean {    // 网络图片地址    private String requestPath;    // 结果返回bitmap对象    private Bitmap bitmap;    public String getRequestPath() {        return requestPath;    }    public voID setRequestPath(String requestPath) {        this.requestPath = requestPath;    }    public Bitmap getBitmap() {        return bitmap;    }    public voID setBitmap(Bitmap bitmap) {        this.bitmap = bitmap;    }}

public class ImageDownloader {    // 成功    static final int SUCCESS = 200;    // 失败    static final int ERROR = 404;    public voID down(Callback callback, ImageBean imageBean) {        new Thread(new DownLoader(callback, imageBean)).start();    }    static final class DownLoader implements Runnable {        private final Callback callback;        private final ImageBean imageBean;        public DownLoader(Callback callback, ImageBean imageBean) {            this.callback = callback;            this.imageBean = imageBean;        }        @OverrIDe        public voID run() {            try {                URL url = new URL(imageBean.getRequestPath());                httpURLConnection httpURLConnection = (httpURLConnection) url.openConnection();                httpURLConnection.setConnectTimeout(5000);                httpURLConnection.setRequestMethod("GET");                if (httpURLConnection.getResponseCode() == httpURLConnection.http_OK) {                    inputStream inputStream = httpURLConnection.getinputStream();                    Bitmap bitmap = BitmapFactory.decodeStream(inputStream);                    showUi(SUCCESS, bitmap);                } else {                    showUi(ERROR, null);                }            } catch (Exception e) {                e.printstacktrace();                showUi(ERROR, null);            }        }        private voID showUi(int resultCode, Bitmap bitmap) {            if (callback != null) {                imageBean.setBitmap(bitmap);                callback.callback(resultCode, imageBean);            }        }    }}

在MianActivity中  我们在onCreat()方法中故意写了内存泄漏的代码    ,一旦用户退出了  MainAvtivity 还会持有对象  如下内存分析情况

总结

以上是内存溢出为你收集整理的Android为什么会有MVP呢?全部内容，希望文章能够帮你解决Android为什么会有MVP呢?所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。