小编MrS*_*ent的帖子

所以我有一个活动，我希望它全屏显示，显示标题栏和系统按钮（后退，最小化......）。我确实从developers.android.com获取了一段代码，它确实会全屏显示，但是当我按下屏幕时，标题会弹出，按钮也会出现，我希望它仅在我向上/向下滑动手指时才弹出在我的屏幕的顶部/底部。

我的活动如下所示：

package com.example.nsomething.main;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import com.example.nsomething.R;

public class Report extends Activity {

    @TargetApi(Build.VERSION_CODES.KITKAT)
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().getDecorView().setSystemUiVisibility(
                View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                        | View.SYSTEM_UI_FLAG_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
        setContentView(R.layout.report);

        initialize();
    }

    private void initialize() {
        Button report = (Button) findViewById(R.id.button1);
        report.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                startActivity(new Intent(Report.this, Harta.class));
                finish();
            }
        });
    }

}

所以我有三个按钮,比方说1,2和3.我想,当我点击button1时,取消选择button2和button3.之后,当我点击button2时,我想要取消选择button1和button3.button3也是如此.

基本上,当我单击一个按钮时,我希望取消选择其他2个按钮.到目前为止,我有以下代码,但我被困在某处,我看不出错误.

if(smallbuttonpage1.isSelected()){
    normalbuttonpage1.setSelected(false);
    bigbuttonpage1.setSelected(false);
    textpage1.setFont(new Font("ComicSansMS", Font.PLAIN, 8));
}
if(normalbuttonpage1.isSelected()){
    smallbuttonpage1.setSelected(false);
    bigbuttonpage1.setSelected(false);
    textpage1.setFont(new Font("ComicSansMS", Font.PLAIN, 12));
}
if(bigbuttonpage1.isSelected()){
    smallbuttonpage1.setSelected(false);
    normalbuttonpage1.setSelected(false);
    textpage1.setFont(new Font("ComicSansMS", Font.PLAIN, 20));
}

我正在学习Java,到目前为止我已经达到了Vectors,但我的IDE似乎给了我一些问题,所以我想问你一个可能解决我的问题的方法.

import java.util.*;

public class Vector {
    public static void main(String args[]) {
        // initial size is 3, increment is 2
        Vector v = new Vector(3, 2);
        System.out.println("Initial size: " + v.size());
        System.out.println("Initial capacity: " + v.capacity());
        v.addElement(new Integer(1));
        v.addElement(new Integer(2));
        v.addElement(new Integer(3));
        v.addElement(new Integer(4));
        System.out.println("Capacity after four additions: " + v.capacity());

        v.addElement(new Double(5.45));
        System.out.println("Current capacity: " + v.capacity());
        v.addElement(new Double(6.08));
        v.addElement(new Integer(7));
        System.out.println("Current capacity: " + v.capacity());
        v.addElement(new Float(9.4));
        v.addElement(new Integer(10));
        System.out.println("Current capacity: " + v.capacity());
        v.addElement(new …

所以我有一个700x700的屏幕,我想创建一个物体(一个小行星)从屏幕左侧移动到右侧.一旦它离开屏幕,我希望它随机产生Y ana做同样的事情.到目前为止,我创建的对象以随机Y生成并向右移动,但是,在0:100像素和600:700像素之间,我有对象,我不希望我的对象产生并穿过这些对象.我希望随机Y介于101和599之间.

if (centerX > width + 200) {
                isTravelling = false;
                centerX = -200;
                centerY = (int)(Math.random());
            }