主函数天气

package com.coolweather.android;

import android.content.Intent;import android.content.SharedPreferences;import android.preference.PreferenceManager;import android.support.v7.app.ActionBar;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;

import static com.baidu.location.h.i.R;

public class MainActivity extends AppCompatActivity {

@Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);        if (prefs.getString("weather", null) != null) {            Intent intent = new Intent(this, WeatherActivity.class);            startActivity(intent);            finish();        }        else {            String weatherId="CN101110101";            Intent intent = new Intent(this, WeatherActivity.class);            intent.putExtra("weather_id", weatherId);            startActivity(intent);            finish();        }    }

}