这是一个错误,说我必须实施OnFragmentInteractionListener,但据我所知,我正在实施它...任何帮助将不胜感激.
主要活动
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
public class MainActivity extends Activity implements NavFragment.OnFragmentInteractionListener, ContentFragment.OnFragmentInteractionListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.nav, new NavFragment());
fragmentTransaction.commit();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.content, new ContentFragment());
fragmentTransaction.commit();
}
@Override
public void onNavFragmentInteraction(String string) {
Bundle args = new Bundle();
args.putString("string", string);
ContentFragment content = new ContentFragment();
content.setArguments(args);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
@Override
public void onContentFragmentInteraction(String …我正在尝试在Fresco中加载图像,但图像似乎没有加载.当我添加占位符视图时,占位符显示.
public static void loadImg(final Context c, final SimpleDraweeView view, final String img){
Uri uri = Uri.parse("https://placekitten.com/g/201/300");
view.setImageURI(uri);
}
注意,我正在应用程序中初始化Fresco,并且我在Manifest中有互联网使用.
SimpleDraweeView
<com.facebook.drawee.view.SimpleDraweeView
android:id="@+id/small_box_image"
android:layout_width="match_parent"
android:layout_height="150dp"
fresco:placeholderImage="@drawable/google"
fresco:fadeDuration="300"
fresco:viewAspectRatio="1.33"
/>
调用loadImg的方法
public static View generateTileView(Context c, Tile t){
LayoutInflater inflater = (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view;
boolean desc = false;
switch(t.getObjectTypeName()){
case Tile.OBJECT_NAME:
view = inflater.inflate(R.layout.view_tile_small_object, null);
break;
case Tile.LOOK_CLOSER_NAME:
view = inflater.inflate(R.layout.view_tile_small_look_closer, null);
desc = true;
break;
case Tile.STORY_NAME:
view = inflater.inflate(R.layout.view_tile_small_story, null);
desc = true;
break;
case Tile.TOUR_NAME:
view = …我试图通过测量视图并动态设置高度来RecyclerView使用a StaggeredGridLayout并使其成为固定高度.我压倒了onMeasure(),但似乎并不总是正确测量.我说它大约50%的时间都有效.其他50%的时间用于衡量它.我认为它与文本包装时有关view_tile_small.xml,但我不确定.
分段
public class AtTheMuseumFragment extends Fragment implements SwipeRefreshLayout.OnRefreshListener{
//Odds n Ends Variables
private MapFragment mapFragment;
private FragmentTransaction fragmentTransaction;
private User user = new User();
private MuseumCollection museumCollection;
private Context context;
//Story Grid Adapter Variables
private AtTheMuseumAdapter nearMeAdapter;
private TileFactory tileFactory;
//Interfaces
private OnFragmentChangeListener changeListener;
@Bind(R.id.stories_list_view) RecyclerView storiesListView;
@Bind(R.id.swipe_container) SwipeRefreshLayout swipeRefreshLayout;
public static AtTheMuseumFragment newInstance(MuseumCollection museumCollection) {
AtTheMuseumFragment fragment = new AtTheMuseumFragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
public …我正在尝试为我们设置测试,以验证用户名和密码的基本身份验证阻止的路径的用户名和密码.
it('should receive a status code of 200 with login', function(done) {
request(url)
.get("/staging")
.expect(200)
.set('Authorization', 'Basic username:password')
.end(function(err, res) {
if (err) {
throw err;
}
done();
});
});
我知道Java中的(2*i ==(i ^(i - 1)+ 1)会让我发现一个数字是否是2的幂.但有人可以解释为什么这有效吗？
我有一个循环,直到用户单击一个就绪按钮,然后它启动if语句中的循环,但它只能在它之前有一个print语句.它与规则集是如何静态有关吗？Button无论如何都可以工作,但只有print语句存在才能进入循环.
package gameoflife;
public class GameOfLife {
public static final int HEIGHT = 16;
public static final int LENGTH = 16;
public static Grid current;
public static void main(String[] args) {
Ui gui = new Ui();
int time = 0;
while (true) {
RuleSet.checkReady();
//System.out.println(RuleSet.checkReady());
if (RuleSet.checkReady() == true) {
//System.out.println("ready!");
if(time == 0){
current = gui.getUserSeed();
}
while (time < 100) {
current.print();
Grid next = new Grid(HEIGHT, LENGTH);
for (int i = 0; i < HEIGHT; i++) { …我找到了一个通过串行端口在 Java 中与 Arduino 进行通信的代码，并想尝试让它工作，以便扩展它以实现项目构想，但我不断收到此错误
Stable Library
=========================================
Native lib Version = RXTX-2.2-20081207 Cloudhopper Build rxtx.cloudhopper.net
Java lib Version = RXTX-2.1-7
WARNING: RXTX Version mismatch
Jar version = RXTX-2.1-7
native lib Version = RXTX-2.2-20081207 Cloudhopper Build rxtx.cloudhopper.net
Could not find COM port.
Started
我认为这意味着 RXTX 库的 jar 不匹配，但本机库中构建的链接不再存在。我不太确定如何解决这个问题。如果您认为这是问题所在，我的代码如下。任何帮助，将不胜感激。
import java.io.OutputStream;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.io.InputStream;
import java.util.Enumeration;
public class AraInterface {
SerialPort serialPort;
/** The port we're normally going to use. */
private static final …我正在用 C 编写一个 shell，但我无法理解execvp(filepath,argv).
如果输入的用户想要ls -a在他们当前的目录中运行......让我们说/home/user1......在所述目录中运行的filepathandargv是ls什么？
请问filepath是哪里的命令将被执行的目录/home/user1或者这将是命令的位置/bin/ls？
我有一个我认为是数学错误的东西,我不完全理解它为什么会发生.
if (mNextBottomIndex < mBlocks.size() - 1) {
if (mBlocks[mNextBottomIndex + 1]->getGlobalPosition().y >= -mBlocks[mNextBottomIndex + 1]->getHeight()) {
mBlocks[mNextBottomIndex + 1]->setAlpha(1.0f);
mNextBottomIndex++;
}
}
它正在评估inner if statement因为mBlocks.size() = 0和mNextBottomIndex = 3(或mNextBottomIndex等于任何数字> 0).所以我的问题是,鉴于最后一句中的变量,它是如何过去的outer if statement？应用程序不在后台线程中处理这些变量,并且变量在之前和之后是相同的outer if statement
我纠正外if statement是
if (mBlocks.size() != 0 && mNextBottomIndex < mBlocks.size() - 1) {
if (mBlocks[mNextBottomIndex + 1]->getGlobalPosition().y >= -mBlocks[mNextBottomIndex + 1]->getHeight()) {
mBlocks[mNextBottomIndex + 1]->setAlpha(1.0f);
mNextBottomIndex++;
}
}
它现在似乎没有崩溃.
以下代码给出了分段错误
void parseInput(char usrIn[])
{
char retCmd[MAX_INPUT];
retCmd[0] = usrIn[0];
printf('Debug: %c\n', retCmd[0]);
}
这是我在C中的第一个大项目,但我认为这是printf给我的错误..但是我不确定......
有没有办法知道x是否是for循环的以下基本示例中字符串的最后一个元素
for x in string_time:
do something