小编Mic*_* M.的帖子

我创建了一个实现MapsView的应用程序.当我点击标记时,它将显示信息窗口,其中使用picasso从数据库中检索数据.它工作正常,但问题是信息窗口中的图像没有显示我需要的图像,它仍然显示占位符图像.但是当我点击地图并再次点击标记时,它会显示我需要的图像.但如果我没有点击地图(仍然点击标记),它仍然总是显示占位符标记.如何用时间显示我需要的图像(占位符图像将替换为我需要的图像)？

这是我的代码

public void plotMarkers(ArrayList<MyMarker> markers) {
    if(markers.size() > 0) {
        for (MyMarker myMarker : markers)
        {
            dest = new LatLng(myMarker.getmLatitude(), myMarker.getmLongitude());
            markerOption = new MarkerOptions().position(dest);
            location_marker = mMap.addMarker(markerOption);
            Target target = new PicassoMarker(location_marker);
            targets.add(target);

            ImageView image = new ImageView(this);
            image.setImageResource(R.mipmap.marker);
            int width = image.getDrawable().getIntrinsicWidth();
            int height = image.getDrawable().getIntrinsicHeight();

            Picasso.with(MapsActivity.this).load(myMarker.getmIcon()).resize(width, height).onlyScaleDown().into(target);
            mMarkersHashMap.put(location_marker, myMarker);

            i = getIntent();
            if(i.getBooleanExtra("maps", true)) {
                location_marker.setTitle(i.getStringExtra("nama"));
                mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(dest, 16));
            }
            else {
                mMap.setInfoWindowAdapter(new MarkerInfoWindowAdapter());
            }
        }
    }
}

public class MarkerInfoWindowAdapter implements GoogleMap.InfoWindowAdapter
{
    @Override
    public View …

我有一个Email EditText,我想通过电子邮件验证来检查它.

这是我的电子邮件验证码

public final static boolean isValidEmail(CharSequence target) {
    if (target == null) {
        return false;
    } else {
        return android.util.Patterns.EMAIL_ADDRESS.matcher(target).matches();
    }
}

public void showAlertValidation() {
    AlertDialog.Builder alertDialog = new AlertDialog.Builder(RegisterActivity.this);
    alertDialog.setTitle("Failed");
    alertDialog.setMessage("Invalid Email");
    alertDialog.setNegativeButton("Close", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
        }
    });
    alertDialog.show();
}

这是我的EditText验证码

editTextEmail= (EditText) findViewById(R.id.editTextEmail);
email = editTextEmail.getText().toString();
if(email.length() == 0) {
    editTextEmail.setError("Email required!");
    if (isValidEmail(email)) {
          Toast.makeText(getApplicationContext(),"valid email address",Toast.LENGTH_SHORT).show();
     }
     else{
          showAlertValidation();
     }
}

问题是EditText的结果.当EditText的值为null时,它会运行showAlertValidation(); 但是如果EditText的值是"email"或"email @ …