Android开发中简单设置启动界面的方法

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="@drawable/launch"
  android:orientation="vertical">
</LinearLayout>

public class LaunchActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //加载启动图片
    setContentView(R.layout.activity_launch);
    //后台处理耗时任务
    new Thread(new Runnable() {
      @Override
      public void run() {
        //耗时任务，比如加载网络数据
        runOnUiThread(new Runnable() {
          @Override
          public void run() {
            //跳转至 MainActivity
            Intent intent = new Intent(LaunchActivity.this, MainActivity.class);
            startActivity(intent);
            //结束当前的 Activity
            LaunchActivity.this.finish();
          }
        });
      }
    }).start();
  }
}

public class LaunchActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //加载启动界面
    setContentView(R.layout.activity_launch);
    Integer time = 2000;  //设置等待时间，单位为毫秒
    Handler handler = new Handler();
    //当计时结束时，跳转至主界面
    handler.postDelayed(new Runnable() {
      @Override
      public void run() {
        startActivity(new Intent(LaunchActivity.this, MainActivity.class));
        LaunchActivity.this.finish();
      }
    }, time);
  }
}