Java 在特定时间更改图像
我正在做一个android studio项目,试图让图像每半小时改变一次, 我学习了一个例子,但我没有运气;它不会出错,只是不起作用,这就是我所拥有的 我试过的是:Java 在特定时间更改图像,java,android,Java,Android,我正在做一个android studio项目,试图让图像每半小时改变一次, 我学习了一个例子,但我没有运气;它不会出错,只是不起作用,这就是我所拥有的 我试过的是: public class MainActivity extends AppCompatActivity { long startTime = 0; Handler feed = new Handler(); Runnable runTimer = new Runnable() { @Override public
public class MainActivity extends AppCompatActivity {
long startTime = 0;
Handler feed = new Handler();
Runnable runTimer = new Runnable()
{
@Override
public void run() {
Calendar now = Calendar.getInstance();
TextView output = (TextView) findViewById(R.id.output);
ImageView roto = (ImageView) findViewById(R.id.earthView);
Globals g = (Globals) getApplication();
int vision = 0;
int visionb = 0;
int hour = now.get(Calendar.HOUR);
int minute = now.get(Calendar.MINUTE);
String[] epos = g.getData56();
if (minute >= 30) {
visionb = 1;
}
if (minute < 30) {
visionb = 0;
}
long millis = System.currentTimeMillis() - startTime;
int seconds = (int) (millis / 1000);
int minutes = seconds / 60;
seconds = seconds % 60;
output.setText(String.format("%d:%02d", minutes, seconds));
vision = ((hour * 2) + visionb);
int resID = getResources().getIdentifier(epos[vision], "drawable", getPackageName());
if (roto != null) {
roto.setImageResource(resID);
feed.postDelayed(this, 500); // tried moving this around and changing the value from 0 - 3000
}
startTime = System.currentTimeMillis();
feed.postDelayed(runTimer, 500); // tried moving this around and changing the value from 0 - 3000
}
};
public类MainActivity扩展了AppCompatActivity{
长起始时间=0;
Handler提要=新的Handler();
Runnable runTimer=new Runnable()
{
@凌驾
公开募捐{
Calendar now=Calendar.getInstance();
TextView输出=(TextView)findViewById(R.id.output);
ImageView roto=(ImageView)findViewById(R.id.earthView);
Globals g=(Globals)getApplication();
int vision=0;
int-visionb=0;
int hour=now.get(Calendar.hour);
int minute=now.get(Calendar.minute);
字符串[]epos=g.getData56();
如果(分钟>=30){
visionb=1;
}
如果(分钟<30){
visionb=0;
}
long millis=System.currentTimeMillis()-startTime;
整数秒=(整数)(毫秒/1000);
整数分钟=秒/60;
秒=秒%60;
output.setText(String.format(“%d:%02d”,分,秒));
视力=((小时*2)+visionb);
int resID=getResources().getIdentifier(epos[vision],“drawable”,getPackageName());
if(roto!=null){
旋转图像资源(剩余);
feed.postDelayed(this,500);//尝试将其四处移动并将值从0更改为3000
}
startTime=System.currentTimeMillis();
feed.postDelayed(runTimer,500);//尝试将其四处移动并将值从0更改为3000
}
};
为了测试我的代码,我将其放入一个onUserInteraction方法中,它工作得非常好:
@Override
public void onUserInteraction() {
super.onUserInteraction();
final Globals g = (Globals) getApplication();
Calendar now = Calendar.getInstance();
ImageView roto = (ImageView) findViewById(R.id.earthView);
int vision = 0;
int visionb = 0;
int hour = now.get(Calendar.HOUR);
int minute = now.get(Calendar.MINUTE);
String[] epos = g.getData56();
if (minute >= 30) {
visionb = 1;
}
if (minute < 30) {
visionb = 0;
}
vision = ((hour * 2) + visionb);
int resID = getResources().getIdentifier(epos[vision], "drawable", getPackageName());
if (roto != null) {
roto.setImageResource(resID);
}
}
@覆盖
公共关系{
super.onUserInteraction();
final Globals g=(Globals)getApplication();
Calendar now=Calendar.getInstance();
ImageView roto=(ImageView)findViewById(R.id.earthView);
int vision=0;
int-visionb=0;
int hour=now.get(Calendar.hour);
int minute=now.get(Calendar.minute);
字符串[]epos=g.getData56();
如果(分钟>=30){
visionb=1;
}
如果(分钟<30){
visionb=0;
}
视力=((小时*2)+visionb);
int resID=getResources().getIdentifier(epos[vision],“drawable”,getPackageName());
if(roto!=null){
旋转图像资源(剩余);
}
}
所以我假设我做错了什么,有人知道我做错了什么或错过了什么吗
谢谢你的帮助着陆这是工作结果,给了我一个时钟和每1/2小时
当天的改变我的形象(共有48张图片),再次感谢您的帮助
long startTime = 0;
{
final Handler feed = new Handler();
final Runnable runTimer = new Runnable() {
@Override
public void run() {
Calendar now = Calendar.getInstance();
TextView output = (TextView) findViewById(R.id.output);
ImageView roto = (ImageView) findViewById(R.id.earthView);
Globals g = (Globals) getApplication();
int vision = 0;
int visionb = 0;
int second = now.get(Calendar.SECOND);
int hour = now.get(Calendar.HOUR);
int minute = now.get(Calendar.MINUTE);
String[] epos = g.getData56();
if (minute >= 30) {visionb = 1;}
if (minute < 30) {visionb = 0;}
output.setText(String.format(hour + ":" + minute + ":" + second));
feed.postDelayed(this, 0);
if (minute == 30 || minute == 0) {vision = ((hour * 2) + visionb);
int resID = getResources().getIdentifier(epos[vision], "drawable", getPackageName());
if (roto != null) {
roto.setImageResource(resID);
}
}
startTime = System.currentTimeMillis();
}
};
feed.postDelayed(runTimer,1000);
}
long startTime=0;
{
最终处理程序提要=新处理程序();
final Runnable runTimer=new Runnable(){
@凌驾
公开募捐{
Calendar now=Calendar.getInstance();
TextView输出=(TextView)findViewById(R.id.output);
ImageView roto=(ImageView)findViewById(R.id.earthView);
Globals g=(Globals)getApplication();
int vision=0;
int-visionb=0;
int second=now.get(Calendar.second);
int hour=now.get(Calendar.hour);
int minute=now.get(Calendar.minute);
字符串[]epos=g.getData56();
如果(分钟>=30){visionnb=1;}
如果(分钟<30){visionnb=0;}
output.setText(String.format(小时+“:“+分钟+”:“+秒));
feed.postDelayed(这个,0);
如果(分钟==30 | |分钟==0){vision=((小时*2)+visionb);
int resID=getResources().getIdentifier(epos[vision],“drawable”,getPackageName());
if(roto!=null){
旋转图像资源(剩余);
}
}
startTime=System.currentTimeMillis();
}
};
feed.postDelayed(运行计时器,1000);
}
您可以尝试以下答案:
我想你忘了安排第一次投递。 这是一个使用Handler和Runnable计划定期事件的示例。 该行计划第一次运行
handler.post(runTimer);
run()中的这一行为运行时的后续事件安排时间:
handler.postDelayed(this, 1000);
注意1000意味着一秒钟。因此30分钟将是60*1000*30,在你的情况下是1800000
例如:
public class MainActivity extends AppCompatActivity {
TextView mTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextView = (TextView) findViewById(R.id.textview);
final Handler handler = new Handler();
Runnable runTimer = new Runnable()
{
@Override
public void run() {
mTextView.setText("Current Time: " + (new Date()).toString());
handler.postDelayed(this, 1000);
}
};
handler.post(runTimer);
}
}
此外,您可能希望通过以下方式删除计划的延迟事件来停止循环:
handler.removeCallbacks(runTimer);
谢谢你,是的,这就是我所做的,我没有在第一篇文章中使用handler.post(runTimer)在错误的位置
handler.removeCallbacks(runTimer);