什么是MVP呢？它又和我们常常听到的MVC有什么关系了以及区别呢？
ProgressBar控件和TextView控件，我们判断它是否有网络连接，如果有的话就隐藏 ProgressBar和跳转到MainActivity如果没有网络的话则显示ProgressBar和TextView，TextView则提示用户No internet。就这么简单的一个需求，我们看看如何用MVP模式做这个需求
首先我们看下M层是如何接口写的
<span style="font-size:18px;">package com.manning.androidhacks.hack020.presenter.model;
public interface IConnectionStatus {
boolean isOnline();
}
</span>然后看看实现（我们主要是看MVP模式的使用，所以在此就不做网络连接的检查了，模拟一个状态）
<span style="font-size:18px;">package com.manning.androidhacks.hack020.presenter.model.impl;
import com.manning.androidhacks.hack020.presenter.model.IConnectionStatus;
public class ConnectionStatus implements IConnectionStatus {
@Override
public boolean isOnline() {
// TODO: Here we should place the code to check the connectivity.
return true;
}
}</span>然后我们在来看看M的接口
<span style="font-size:18px;">package com.manning.androidhacks.hack020.view;
public interface ISplashView {
void showProgress();
void hideProgress();
void showNoInetErrorMsg();
void moveToMainView();
}
</span>以及M的实现
<span style="font-size:18px;">package com.manning.androidhacks.hack020.view.impl;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;
import com.manning.androidhacks.hack020.R;
import com.manning.androidhacks.hack020.presenter.SplashPresenter;
import com.manning.androidhacks.hack020.view.ISplashView;
public class SplashActivity extends Activity implements ISplashView {
private TextView mTextView;
private ProgressBar mProgressBar;
private SplashPresenter mPresenter = new SplashPresenter();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
mPresenter.setView(this);
mTextView = (TextView) findViewById(R.id.splash_text);
mProgressBar = (ProgressBar) findViewById(R.id.splash_progress_bar);
}
@Override
protected void onResume() {
super.onResume();
mPresenter.didFinishLoading();
}
public void showProgress() {
mProgressBar.setVisibility(View.VISIBLE);
}
public void hideProgress() {
mProgressBar.setVisibility(View.INVISIBLE);
}
public void showNoInetErrorMsg() {
mTextView.setText("No internet");
}
@Override
public void moveToMainView() {
startActivity(new Intent(this, MainActivity.class));
}
}</span>
最后我们来看看P层是如何控制他们的逻辑的：
<span style="font-size:18px;">package com.manning.androidhacks.hack020.view.impl;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;
import com.manning.androidhacks.hack020.R;
import com.manning.androidhacks.hack020.presenter.SplashPresenter;
import com.manning.androidhacks.hack020.view.ISplashView;
public class SplashActivity extends Activity implements ISplashView {
private TextView mTextView;
private ProgressBar mProgressBar;
private SplashPresenter mPresenter = new SplashPresenter();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
mPresenter.setView(this);
mTextView = (TextView) findViewById(R.id.splash_text);
mProgressBar = (ProgressBar) findViewById(R.id.splash_progress_bar);
}
@Override
protected void onResume() {
super.onResume();
mPresenter.didFinishLoading();
}
public void showProgress() {
mProgressBar.setVisibility(View.VISIBLE);
}
public void hideProgress() {
mProgressBar.setVisibility(View.INVISIBLE);
}
public void showNoInetErrorMsg() {
mTextView.setText("No internet");
}
@Override
public void moveToMainView() {
startActivity(new Intent(this, MainActivity.class));
}
}</span>ym——Android开发MVP模式（解决了View和Model的耦合）
原文地址：http://blog.csdn.net/cym492224103/article/details/38776873
