package com.example.dell.apps;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Window;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.TextView;

import com.example.dell.apps.MainActivity;
import com.example.dell.apps.R;

public class WelcomeActivity extends Activity {
    // 声明控件对象
    private TextView textView;
    //声明时间有多少;
    private int count = 5;
    private Animation animation;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 下面的话就是去除标题的方法
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_welcome);
        // 初始化控件对象textView
        textView = (TextView) findViewById(R.id.textView);
        animation = AnimationUtils.loadAnimation(this, R.anim.animation_text);
        handler.sendEmptyMessageDelayed(0, 1000);
    }
    //咱在写一个计算Welcome界面的广告时间结束后进入主界面的方法
    private int getCount() {
        count--;
        if (count == 0) {
            Intent intent = new Intent(this, MainActivity.class);
            startActivity(intent);
            finish();
        }
        return count;
    }
    //进行一个消息的处理
    @SuppressLint("HandlerLeak")
    private Handler handler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            if (msg.what == 0) {
                textView.setText(getCount()+"");
                handler.sendEmptyMessageDelayed(0, 1000);
                animation.reset();
                textView.startAnimation(animation);
            }
        };
    };
}

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
 <alpha
  android:duration="1000"
  android:fromAlpha="0.0"
  android:toAlpha="1.0" />
 <scale
  android:duration="800"
  android:fromXScale="1.5"
  android:fromYScale="1.5"
  android:pivotX="50%"
  android:pivotY="50%"
  android:toXScale="1.0"
  android:toYScale="1.0" />
</set>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <ImageView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@mipmap/welcome"/>  //自己选择图片
    </LinearLayout>
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:orientation="horizontal" >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:text="广告倒计时："
            android:textColor="#ffffff"
            android:textSize="10sp" />
        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:text="5"
            android:textColor="#ffffff"
            android:textSize="10sp" />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:text="s"
            android:textColor="#ffffff"
            android:textSize="10sp" />
    </LinearLayout>
</FrameLayout>

<intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>