问题陈述了为什么这个计时器没有执行？我把它设置在片段中，我觉得它与我的runOnUiThread有关，但我不确定。此外，我应该补充说，我没有得到任何错误或任何它不会执行。
final WeakReference<Activity> activityRef = new WeakReference<Activity>((getActivity()));
//creating timer
public void startRandomButton(final ImageView img)
{
Timer timer = new Timer();
timer.schedule(new TimerTask()
{
@Override
public void run()
{
if(activityRef.get() == null)
return;
//activityRef.get().runOnUiThread(new Runnable()
if(isAdded())
{
activityRef.get().runOnUiThread(new Runnable() {
@Override
public void run() {
Activity activity = activityRef.get();
if (isAdded())
randomMovement(img);
else
Log.d("not added", "not added");
}
});
}
else
Log.d("Run on ui thread", "is null");
}
}, 5000);
}
下面是我创建计时器时出现问题的整个片段。就像我在原始问题中说的那样，我不确定问题是什么。代码编译并执行得很好。计时器方法虽然不会工作。我有我的日志猫告诉我什么时候一个活动被破坏或者当你经历这个时你会看到我告诉我哪里的东西是空的而且我没有得到任何错误。非常感谢帮助！：
package com.example.name.inserttitlename;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Point;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.support.annotation.NonNull;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import android.os.Handler;
import android.view.InflateException;
import java.lang.ref.WeakReference;
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;
import java.util.logging.Level;
import static android.R.attr.x;
/**
* A simple {@link Fragment} subclass.
*/
public class LevelOneFragment extends Fragment {
//creating variables
private ImageView img;
private ViewGroup viewer;
TextView textCount;
Button failButton;
Button beginButton;
TextView countDownBeginText;
private TextView countDownMain;
public int scoreCounter;
public LevelOneFragment() {
// Required empty public constructor
}
@Override
public void onAttach(Context context)
{
super.onAttach(context);
Activity a;
if(context instanceof Activity)
{
a=(Activity) context;
}
}
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_level_one, container, false);
//creating viewables and such
viewer = (ViewGroup) view.findViewById(R.id.view_level);
img = (ImageView) view.findViewById(R.id.imageView);
failButton = (Button) view.findViewById(R.id.failureButton);
countDownMain = (TextView) view.findViewById(R.id.countDownMain);
countDownBeginText = (TextView) view.findViewById(R.id.countDownBeginText);
beginButton = (Button) view.findViewById(R.id.beginButton);
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(150, 150);
img.setLayoutParams(layoutParams);
img.setOnTouchListener(new LevelOneFragment.ChoiceTouchListener());
//begin random movement
startRandomButton(img);
//setting up button for failure CORRECT TO TAKE YOU TO THE MAIN MENU
failButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
startActivity(new Intent(getActivity(), MainMenu.class));
}
});
//setting countdown text to 3
countDownBeginText.setText(":3");
//begin countdown from three
beginButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View beginT) {
CountDownTimer countDownTimer = new CountDownTimer(3*1000, 3) {
@Override
public void onTick(long millisUntilFinished) {
countDownBeginText.setText(":" + millisUntilFinished/1000);
//add possible sound here every tick
}
@Override
public void onFinish() {
beginButton.setVisibility(View.INVISIBLE);
countDownBeginText.setVisibility(View.INVISIBLE);
//countdown from 60------- change parameters in count down timer to the time desired
CountDownTimer countDownTimer = new CountDownTimer(60*1000, 3) {
@Override
public void onTick(long millisUntilFinishedMain) {
countDownMain.setText(":" + millisUntilFinishedMain/1000);
//add possible sound here every tick
}
@Override
public void onFinish() {
//Toast.makeText(getActivity(),"You lose", Toast.LENGTH_LONG).show();
//rest of text in method is trial
startActivity(new Intent(getActivity(), MainMenu.class ));
}
}.start();
}
}.start();
}
});
return view;
}
@Override
public void onActivityCreated(Bundle savedInstatnceCState)
{
super.onActivityCreated(savedInstatnceCState);
}
//getting screen size
public static Point getDisplaySize(@NonNull Context context){
Point point = new Point();
WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
manager.getDefaultDisplay().getSize(point);
return point;
}
//randomly move
public void randomMovement(ImageView img){
int x = new Random().nextInt(getDisplaySize(getActivity()).x);
int y = new Random().nextInt(getDisplaySize(getActivity()).y);
img.setY(y);
img.setX(x);
}
final WeakReference<Activity> activityRef = new WeakReference<Activity>((getActivity()));
//creating timer
public void startRandomButton(final ImageView img)
{
Timer timer = new Timer();
timer.schedule(new TimerTask()
{
@Override
public void run()
{
if(activityRef.get() == null)
return;
//activityRef.get().runOnUiThread(new Runnable()
if(isAdded())
{
activityRef.get().runOnUiThread(new Runnable()
{
@Override
public void run()
{
Activity activity = activityRef.get();
if (isAdded())
randomMovement(img);
else
Log.d("not added", "not added");
}
});
}
else
Log.d("Run on ui thread", "is null");
}
}, 5000);
}
//listener for the moving ball
private final class ChoiceTouchListener implements View.OnTouchListener {
public boolean onTouch(View view, MotionEvent event){
//Calling Counter
textCount = (TextView) getView().findViewById(R.id.textViewCount);
//switch statement for different events
switch (event.getAction() & MotionEvent.ACTION_MASK){
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_UP:
//this is where youre going to generate randmom location with id.setX(randomX) and id.setY(randomY)
randomMovement(img);
//Setting Counter to count when img is clicked
String countValue = textCount.getText().toString();
scoreCounter = Integer.parseInt(countValue);
scoreCounter++;
textCount.setText(String.valueOf(scoreCounter));
break;
case MotionEvent.ACTION_POINTER_DOWN:
break;
case MotionEvent.ACTION_POINTER_UP:
break;
}
//checking score
if(scoreCounter == 10 )
{
Toast.makeText(getActivity(),"You win", Toast.LENGTH_LONG).show();
}
viewer.invalidate();
return true;
}
}
}
答案 0 :(得分：0)
在课程的其他部分，你也有一些代码也不清楚。所以这里是片段的代码：
#!/bin/bash
count=$(xmllint --xpath "count(//programme)" /tmp/file.xml)
for ((i=1; i<=count; i++)); do
xmllint --xpath "//programme[$i]/title/text()" /tmp/file.xml
echo -n '|'
xmllint --xpath "//programme[$i]/sub-title/text()" /tmp/file.xml
echo
done
我还没有对代码进行测试，因此可能存在细微的错误。