我正在尝试实施密码更新对话框，当用户点击对话框时出现EditText，AlertDialogpops up，EditText在AlertDialog内，但是某种程度上，TextWacther无效。我在这里缺少什么？
final android.app.AlertDialog.Builder alert = new android.app.AlertDialog.Builder(Landing_page.this);
String title="Change Password";
alert.setCancelable(false);
alert.setTitle(title); //Set Alert dialog title here
alert.setIcon(R.drawable.sett);
LinearLayout mainll = new LinearLayout(context);
LinearLayout alertLL = new LinearLayout(context);
alertLL.setOrientation(LinearLayout.HORIZONTAL);
alertLL.setPadding(0, 10, 0, 10);
final LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT, 1f);
final TextView root = new TextView(context);
root.setPadding(10, 0, 10, 0);
root.setTextSize(14);
root.setTextColor(getResources().getColor(R.color.black));
root.setTypeface(tf);
root.setText("Old Password");
final EditText rootpat = new EditText(context);
rootpat.setLayoutParams(params);
rootpat.setTypeface(tff);
LinearLayout alertLL0 = new LinearLayout(context);
alertLL0.setPadding(0, 10, 0, 10);
alertLL0.setOrientation(LinearLayout.HORIZONTAL);
alertLL0.addView(root);
alertLL0.addView(rootpat);
// Set an EditText view to get user input
final TextView tv1 = new TextView(context);
tv1.setPadding(10, 0, 10, 0);
tv1.setTextColor(getResources().getColor(R.color.black));
tv1.setTextSize(14);
tv1.setTypeface(tf);
tv1.setText("New Password");
final EditText topic = new EditText(context);
topic.setLayoutParams(params);
topic.setTypeface(tff);
topic.setFilters(new InputFilter[] {new InputFilter.LengthFilter(16)});
topic.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
if (s.toString().length()<4&&s.toString().length()>16){
topic.setError("Password Should be between 8 and 16 Characters");
requestFocus(topic);
}
}
});
alertLL.addView(tv1);
alertLL.addView(topic);
final TextView tv4 = new TextView(context);
tv4.setPadding(10, 0, 10, 0);
tv4.setText("Confirm Password");
tv4.setTextColor(getResources().getColor(R.color.black));
tv4.setTextSize(14);
tv4.setTypeface(tf);
final EditText sensor = new EditText(context);
sensor.setLayoutParams(params);
sensor.setTypeface(tff);
sensor.setFilters(new InputFilter[] {new InputFilter.LengthFilter(16)});
sensor.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
if (s.toString().length()<4&&s.toString().length()>16){
sensor.setError("Password Should be between 8 and 16 Characters");
requestFocus(sensor);
}
}
});
LinearLayout alertLL4 = new LinearLayout(context);
alertLL4.setPadding(0, 10, 0, 10);
alertLL4.setOrientation(LinearLayout.HORIZONTAL);
alertLL4.addView(tv4);
alertLL4.addView(sensor);
mainll.setOrientation(LinearLayout.VERTICAL);
mainll.addView(alertLL0);
mainll.addView(alertLL);
mainll.addView(alertLL4);
alert.setView(mainll);
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
String pass1=rootpat.getEditableText().toString();
String pass2=topic.getEditableText().toString();
String pass3=sensor.getEditableText().toString();
if (pass2.equalsIgnoreCase(pass3)&&pass1.length()!=0&&pass2.length()!=0&&pass3.length()!=0){
final JSONObject object=new JSONObject();
try{object.put("user_name",user_name);
object.put("new_password",pass2);
object.put("password",pass1);
}catch (JSONException e){e.printStackTrace();}
try {
ClientResource clientResource = new ClientResource(IP.IP+"/api/users/upddate_password");
clientResource.setChallengeResponse(ChallengeScheme.HTTP_BASIC,
"admin", "admin");
Form form = new Form();
form.add("data", object.toString());
Representation representation = clientResource.post(form
.getWebRepresentation());
response=representation.getText().toString();
System.out.println(response);
try {
JSONObject object1=new JSONObject(response);
String mesg= (String) object1.get("message");
Toast.makeText(getApplicationContext(),mesg,Toast.LENGTH_LONG).show();
} catch (JSONException e) {
e.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
}
//dialog.cancel();
}else {
Toast.makeText(getApplicationContext(),"Invalid Credentials.. Try again...",Toast.LENGTH_LONG).show();
}
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
android.app.AlertDialog alertDialog = alert.create();
alertDialog.show();
alertDialog.setCancelable(false);
return true;
请帮助.. !!
答案 0 :(得分：0)
你的病情有问题，
if (s.toString().length()<4&&s.toString().length()>16){
sensor.setError("Password Should be between 8 and 16 Characters");
requestFocus(sensor);
尝试这个
if (s.toString().length()<4 || s.toString().length()>16){
sensor.setError("Password Should be between 8 and 16 Characters");
requestFocus(sensor);
答案 1 :(得分：0)
更改此行，
if (s.toString().length()<4&&s.toString().length()>16){
sensor.setError("Password Should be between 8 and 16 Characters");
requestFocus(sensor);
要，
if ((s.toString().length()< 8) || (s.toString().length()>16)){
topic.setError("Password Should be between 8 and 16 Characters");
// requestFocus(topic);
}
问题：
问题是您使用&&检查密码。如果使用&&两个条件必须为true，则只需将&&替换为||。
有关详细信息，请阅读此Logical Operators in Java