android - 为膨胀布局部署时间延迟

Question

所以我正在尝试创建这个游戏，并且在类(class) Activity 中我有一个漂亮的风景背景。我希望玩家在我的教程弹出 xml 膨胀之前看到这个一两秒。事情是透明弹出 xml 和背景 xml 都会在 Activity 启动后立即出现。我是新手，无法理解 android 开发者主页中的解释。任何帮助将不胜感激。

package com.jibushi;

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class LessonsShell extends Activity {

    private View view;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        setContentView(R.layout.lessons);

        final ViewGroup parent = (ViewGroup) findViewById(R.id.lessons_bg);

        Thread splashTread = new Thread() {
            @Override
            public void run() {
                try {
                    wait(1000);
                } catch (InterruptedException e) {

                } finally {
                    view();
                }
            }

            private void view() {
                // TODO Auto-generated method stub
                view = LayoutInflater.from(getBaseContext()).inflate(
                        R.layout.lessons_dialog, null);
                parent.addView(view);
            }
        };
        splashTread.start();
    }
}

Answer 1

试试这个:

public class LessonsShell extends Activity{
private static final int MESSAGE_SHOW_POPUP=7;
private static final long TIME_DELAY=3000;//3 seconds
private View view;
private Handler handler=new Handler(){
   handleMessage(Message msg){
      switch(msg.what){
        case MESSAGE_SHOW_POPUP:
           view();
           break;
       }
   };
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

setContentView(R.layout.lessons);
//this will send a message to the handler to display the popup after 3 seconds.
handler.sendEmptyMessageDelayed(MESSAGE_SHOW_POPUP,TIME_DELAY);

}

private void view() {
// TODO Auto-generated method stub
 ViewGroup parent = (ViewGroup) findViewById(R.id.lessons_bg);
 view = LayoutInflater.from(getBaseContext()).inflate(R.layout.lessons_dialog, null);
 parent.addView(view);
}

}

处理程序是 android 中定时器的一个很好的替代品。

您之前所做的是在 onCreate 中创建一个后台线程，尝试从那里访问 UI 线程。根据我的经验，它应该会崩溃，因为您无法从后台线程访问 UI 线程。