android 监听app进入后台以及从后台进入前台

package com.pinshang.base;

import com.pinshang.common.CommonValue;
import com.pinshang.investapp.EnterGesturePasswordActivity;
import com.pinshang.investapp.MainApp;
import com.pinshang.utils.AbAppUtil;
import com.umeng.socialize.utils.Log;

import android.content.Intent;
import android.support.v4.app.FragmentActivity;

/**
 * @author hjzhang
 */
public class BaseFragmentActivity extends FragmentActivity {
    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        if (AbAppUtil.isBackground(this)) {
            // app 进入后台
            CommonValue.isActive = true;
            CommonValue.backTime = System.currentTimeMillis();
            Log.d("haijiang", "-------------进入后台------->");
        } else {
            CommonValue.isActive = false;
            CommonValue.backTime = 0;
        }
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        if (CommonValue.isActive) {
            Log.d("haijiang", "------------- 从后台唤醒，进入前台------->");
            if (System.currentTimeMillis() - CommonValue.backTime > 30 * 1000) {
                if (MainApp.theApp.userId > 0
                        && MainApp.theApp.mLoginUtils.getOpen()) {// 登录且开启手势密码
                    if (MainApp.theApp.mLockPatternUtils.hasPattern()) {
                        Intent intent = new Intent(BaseFragmentActivity.this,
                                EnterGesturePasswordActivity.class);
                        intent.putExtra("background", "background");
                        startActivity(intent);
                        overridePendingTransition(0, 0);
                    }
                }
                CommonValue.isActive = false;
                CommonValue.backTime = 0;
            }
        }
    }
}