android保存第一次安装状态并初始化数据

不念不忘少年蓝@ 2022-06-18 03:19 227阅读 0赞

package com.example.cuboo.gatherhar.activity;
    
    import android.content.Context;
    import android.content.Intent;
    import android.content.SharedPreferences;
    import android.content.pm.PackageManager;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    
    import org.litepal.crud.DataSupport;
    
    public class LauchActivity extends AppCompatActivity {
        private float nowVersionCode,saveVersionCode;
        private static final String ISFIRSTLAUCH = "isFirstLauch";
        private static final String SAVEVERSIONCODE = "saveVersionCode";
        private static final String SAVESTATUS = "saveStatus";
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            nowVersionCode = getVersionCode();
            SharedPreferences sp  = getSharedPreferences(ISFIRSTLAUCH,MODE_PRIVATE);
            saveVersionCode = sp.getFloat(SAVEVERSIONCODE,0);
    
            if (nowVersionCode > saveVersionCode) {
                //第一次安装启动
                SharedPreferences.Editor editor = sp.edit();
                editor.putFloat(SAVEVERSIONCODE, nowVersionCode);
                editor.putBoolean(SAVESTATUS, true);
                editor.commit();
                //初始化数据
               
            }
            startActivity(new Intent(this,MainActivity.class));
    
        }
    
        /**
         * 获取应用版本号
         * @return
         * @throws PackageManager.NameNotFoundException
         */
        private float getVersionCode(){
            float versionCode = 0;
            try {
                versionCode = getPackageManager().getPackageInfo(getPackageName(),0).versionCode;
            } catch (PackageManager.NameNotFoundException e) {
                e.printStackTrace();
            }
            return versionCode;
        }
    }