android 启动界面
很多应用都会有一个启动界面。启动画面,展示自己的LOGO、本版信息等,欢迎画面慢慢隐现,然后慢慢消隐。
实现这种效果的方法有两种:
1、使用两个Activity,程序启动时候load第一张Activity,然后由tick触发N秒钟后startActivity另外一张Activity。
2、使用一个Activity,可以用到View.gone() 这个方法。把Acitivity的某些元素移除。
使用两个Activity
import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.view.Window; //SplashActivity 注意要在AndroidManifest.xml配置为启动页 public class SplashActivity extends Activity { public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE);// 去掉标题栏 setContentView(R.layout.splash); MyApplication.getInstance().addActivity(this); Handler x = new Handler(); x.postDelayed(new splashhandler(), 2000); //设置延迟执行时间 } class splashhandler implements Runnable{ public void run() { startActivity(new Intent(getApplication(),LoginActivity.class)); //启动主Activity SplashActivity.this.finish(); // 关闭启动页Activity } } }
启动页布局
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="fill_parent" android:layout_width="fill_parent" android:orientation="vertical" android:background="#ff0099d6"> <ImageView android:layout_height="fill_parent" android:layout_width="fill_parent" android:scaleType="fitCenter" android:src="@drawable/qidongye"> </ImageView> </LinearLayout>
使用一个Activity
public class WebGameActivity extends Activity { private WebView webView; private Handler mHandler = new Handler(); private static final String TAG = "WebGameActivity"; //菜单 private static final int MENU_RELOAD = Menu.FIRST; private static final int MENU_HELP = Menu.FIRST + 1; private static final int MENU_ABOUT = Menu.FIRST + 2; private static final int MENU_CLOSE = Menu.FIRST + 3; private int staus = 0; private static final int STOPSPLASH = 0; //延迟时间 private static final long SPLASHTIME = 1000; private LinearLayout splash; private TextView tv; private Animation myAnimation_Alpha; private Animation animatinoGone ; private Handler splashHandler = new Handler() { public void handleMessage(Message msg) { switch (msg.what) { case STOPSPLASH: if( staus == 1 ){ splash.startAnimation(animatinoGone); splash.setVisibility(View.GONE); break; } sendEmptyMessageDelayed(STOPSPLASH, SPLASHTIME); } super.handleMessage(msg); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().requestFeature(Window.FEATURE_PROGRESS); //去标题栏 setContentView(R.layout.main); animatinoGone = AnimationUtils.loadAnimation(this,R.anim.alpha_gone); //动画效果 myAnimation_Alpha = AnimationUtils.loadAnimation(this,R.anim.alpha_action); //动画效果 splash = (LinearLayout) findViewById(R.id.splashscreen); tv = (TextView) findViewById(R.id.info); tv.setText("正在建立数据连接"); splash.startAnimation(myAnimation_Alpha); Message msg = new Message(); msg.what = STOPSPLASH; splashHandler.sendMessageDelayed(msg, SPLASHTIME); }
布局文件
<?xml version=”1.0″ encoding=”utf-8″?> <LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android” android:orientation=”vertical” android:layout_width=”fill_parent” android:layout_height=”fill_parent”> <LinearLayout android:id=”@+id/splashscreen” android:orientation=”vertical” android:layout_width=”fill_parent” android:layout_height=”fill_parent”> <ImageView android:layout_width=”wrap_content” android:layout_height=”wrap_content” android:src=”@drawable/splash” android:layout_gravity=”center” android:layout_marginTop=”130px”/> <TextView android:id=”@+id/info” android:layout_width=”fill_parent” android:layout_height=”wrap_content” android:gravity=”center” android:paddingTop=”10px” android:text=”This is a splash!!”/> </LinearLayout> <WebView android:id=”@+id/browser” android:layout_width=”fill_parent” android:layout_height=”fill_parent” android:layout_weight=”1″/> </LinearLayout>
有一个id为splashscreen 的linearlayout,是程序启动时显现的部分。id为browser是程序的主界面显示部分。