AppStart.java

package net.oschina.app;

import java.io.File;
import java.util.List;

import net.oschina.app.common.FileUtils;
import net.oschina.app.common.StringUtils;
import net.oschina.app.ui.Main;
import net.wolfcs.ui.MainActivity;
import android.app.Activity;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.widget.LinearLayout;

/**
 * 应用程序启动类：显示欢迎界面并跳转到主界面
 * @author liux (http://my.oschina.net/liux)
 * @version 1.0
 * @created 2012-3-21
 */
public class AppStart extends Activity {
    final AppContext ac = (AppContext) getApplication();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        final View view = View.inflate(this, R.layout.start, null);
        LinearLayout wellcome = (LinearLayout) view.findViewById(R.id.app_start_view);
        check(wellcome);
        setContentView(view);

        // 渐变展示启动屏
        AlphaAnimation aa = new AlphaAnimation(0.3f, 1.0f);
        aa.setDuration(2000);
        view.startAnimation(aa);
        aa.setAnimationListener(new AnimationListener() {
            @Override
            public void onAnimationEnd(Animation arg0) {
                redirectTo();
            }

            @Override
            public void onAnimationRepeat(Animation animation) {
            }

            @Override
            public void onAnimationStart(Animation animation) {
            }

        });

        // 兼容低版本cookie（1.5版本以下，包括1.5.0,1.5.1）
        AppContext appContext = (AppContext) getApplication();
        String cookie = appContext.getProperty("cookie");
        if (StringUtils.isEmpty(cookie)) {
            String cookie_name = appContext.getProperty("cookie_name");
            String cookie_value = appContext.getProperty("cookie_value");
            if (!StringUtils.isEmpty(cookie_name) && !StringUtils.isEmpty(cookie_value)) {
                cookie = cookie_name + "=" + cookie_value;
                appContext.setProperty("cookie", cookie);
                appContext.removeProperty("cookie_domain", "cookie_name", "cookie_value", "cookie_version",
                        "cookie_path");
            }
        }
    }

    /**
     * 检查是否需要换图片
     * 
     * @param view
     */
    private void check(LinearLayout view) {
        String path = FileUtils.getAppCache(this, "welcomeback");
        List<File> files = FileUtils.listPathFiles(path);
        if (!files.isEmpty()) {
            File f = files.get(0);
            long time[] = getTime(f.getName());
            long today = StringUtils.getToday();
            if (today >= time[0] && today <= time[1]) {
                view.setBackgroundDrawable(Drawable.createFromPath(f.getAbsolutePath()));
            }
        }
    }

    /**
     * 分析显示的时间
     * 
     * @param time
     * @return
     */
    private long[] getTime(String time) {
        long res[] = new long[2];
        try {
            time = time.substring(0, time.indexOf("."));
            String t[] = time.split("-");
            res[0] = Long.parseLong(t[0]);
            if (t.length >= 2) {
                res[1] = Long.parseLong(t[1]);
            } else {
                res[1] = Long.parseLong(t[0]);
            }
        } catch (Exception e) {
        }
        return res;
    }

    /**
     * 跳转到...
     */
    private void redirectTo() {
        Intent intent = new Intent(this, MainActivity.class);
        startActivity(intent);
        finish();
    }
}