File Observer方法的java My onEvent()部分不起作用
我已经扫描了所有相关的问题;答案在这里,但我仍然找不到解决方案
服务类文件:
public class otser extends Service {
private WindowManager windowManager;
private ImageView chatHead;
@Override public IBinder onBind(Intent intent) {
return null;
}
@Override public void onCreate() {
super.onCreate();
windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
chatHead = new ImageView(this);
chatHead.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
FileObserver observer = new FileObserver(安卓.os.Environment.getExternalStorageDirectory().toString() + "/Pictures/Screenshots") {
@Override
public void onEvent(int event, String file) {
event &= FileObserver.ALL_EVENTS;
if(event == FileObserver.CREATE){
Toast.makeText(getApplicationContext(), "screenshot taken",
Toast.LENGTH_LONG).show();
}
}
};
observer.startWatching(); // start the observer
Toast.makeText(getApplicationContext(), "service: OK",
Toast.LENGTH_SHORT).show();
}}
根据其他帖子,我通过编程创建了一个文件,再次检查了路径,它确实存在,并且正确无误
活动类:
public class Home extends Activity {
Button showChatHead;
Button stopService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
showChatHead = (Button) findViewById(R.id.gomb);
stopService= (Button) findViewById(R.id.gomb2);
showChatHead.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(getApplicationContext(), ChatHeadService.class);
startService(i);
}
});
stopService.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(getApplicationContext(), ChatHeadService.class);
stopService(i);
}
});
}}
服务类链接良好,最后一条Toast消息弹出,作为一个结论,只有观察者被跳过
有什么想法吗
提前谢谢
更新版本:
FileObserver fileObserver = new FileObserver(安卓.os.Environment.getExternalStorageDirectory().toString() + "/Pictures/Screenshots") {
@Override
public void onEvent(int event, String path) {
Toast.makeText(getApplicationContext(), "method entered", Toast.LENGTH_SHORT).show();
if (event == FileObserver.CREATE) {
handler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(), "File created", Toast.LENGTH_SHORT).show();
}
});
}
}
};
fileObserver.startWatching();
未输入OneEvent方法,未显示“已输入的方法”
# 1 楼答案
被提到,它将运行在另一个线程上,并且您应该考虑这一点。使用处理程序,Toast消息应该如下所示: