Android开机Activity的渐变效果

• 启动Activity的应用

  在AndroidManifest.xml文件中
  将下面部分的代码放置于所用于启动Activity的下面

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

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

开机启动Activity渐变效果后自动消失

package com.example.xiaoming.festival;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;

import java.util.Timer;
import java.util.TimerTask;


public class WelcomeActivity extends AppCompatActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        final View view = View.inflate(this, R.layout.activity_welcome, null);
        setContentView(view);


        //渐变展示启动屏
        AlphaAnimation aa = new AlphaAnimation(0.3f,1.0f);
        aa.setDuration(3000);
        //控制渐变时间
        view.startAnimation(aa);
        aa.setAnimationListener(new Animation.AnimationListener()
        {
            @Override
            public void onAnimationEnd(Animation arg0) {
                redirectTo();
            }
            @Override
            public void onAnimationRepeat(Animation animation) {}
            @Override
            public void onAnimationStart(Animation animation) {}

        });


    }

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

}