用Android编写SplashActivity欢迎界面

1、建立一个SplashActivity活动会自动创建一个activity_splash布局与activity_main主布局有所不同

2、在SplashActivity中写如下代码

import android.content.Intent;

import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;

public class SplashActivity extends AppCompatActivity {
    private  final int SPLASH_DISPLAY_LENGHT=20000;   // 两秒后进入系统
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);
        new Handler().postDelayed(new Runnable() {
            public void run() {
                Intent mainIntent = new Intent(SplashActivity.this,
                        MainActivity.class);
              startActivity(mainIntent);
              finish();
            }
        }, SPLASH_DISPLAY_LENGHT);
}
}

3、将清单文件AndroidManfest.xml中主活动改为.SplashActivity

例如：

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

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