如何显示带有 edittext onTextChanged 的 AlertDialog
How to show AlertDialog with edittext onTextChanged
我有一个 activity 和几个 EditTexts。如果用户单击“Cancel”按钮并且这些 EditTexts 中没有任何变化，那么应用程序应该转到之前的 activity 但如果这些 EditTexts 中有任何变化，那么我希望用户看到 AlertDialog:
Save changes you made?
NO YES
我已经为这些EditTexts设置了一个TextWatcher，例如：
//let's set up a textwatcher so if the state of any of the edittexts has changed.
//if it has changed and user clicks 'CANCEL', we'll ask first, '
//You've made changes here. Sure you want to cancel?'
TextWatcher edittw = 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) {
Toast.makeText(EditContact.this, "change detected", Toast.LENGTH_SHORT).show();
}
};
categoryname.addTextChangedListener(edittw);
namename.addTextChangedListener(edittw);
phonename.addTextChangedListener(edittw);
addressname.addTextChangedListener(edittw);
commentname.addTextChangedListener(edittw);
还有我的 AlertDialog 用于 Cancel 按钮 - 无论任何 EditTexts 是否已更改，它都会出现，但我只希望它仅在进行更改时出现在 EditTexts 中，否则不应该有 AlerDialog，当前的 activity 应该回到之前的 activity - 就像：
private void cancelButton() {
cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//add a dialogue box
AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext());
builder.setMessage("Save changes you made?").setPositiveButton("Yes", dialogClickListener)
.setNegativeButton("No", dialogClickListener).show();
}
});
}
//Are you sure you want to cancel? dialogue
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which){
case DialogInterface.BUTTON_POSITIVE:
//Yes button clicked
pDialog = new ProgressDialog(EditContact.this);
// Showing progress dialog for the review being saved
pDialog.setMessage("Saving...");
pDialog.show();
//post the review_id in the current activity to EditContact.php and
StringRequest stringRequest = new StringRequest(Request.Method.POST, EditContact_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
//hide the dialogue saying 'Saving...' when page is saved
pDialog.dismiss();
Toast.makeText(EditContact.this, response, Toast.LENGTH_LONG).show();
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(EditContact.this, "problem here", Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
//we are posting review_id into our EditContact.php file,
//the second value, review_id,
// is the value we get from Android.
// When we see this in our php, $_POST["review_id"],
//put in the value from Android
params.put("review_id", review_id);
return params;
}
};
AppController.getInstance().addToRequestQueue(stringRequest);
//when cancelled, back to the PopulistoListView class
Intent j = new Intent(EditContact.this,PopulistoListView.class);
startActivity(j);
break;
case DialogInterface.BUTTON_NEGATIVE:
//close the activity
finish();
}
}
};
我在互联网上搜索了包含 'TextWatcher' 和 'AlertDialog' 等短语的教程或帖子，但我没有找到可以帮助我实现我想要做的事情的东西。
尝试像下面这样添加 alertDialog，你可以将对话框放在 onAfterChange 方法中：
TextWatcher edittw = 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) {
Toast.makeText(EditContact.this, "change detected", Toast.LENGTH_SHORT).show();
AlertDialog.Builder builder;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
builder = new AlertDialog.Builder(getApplicationContext(), android.R.style.Theme_Material_Dialog_Alert);
} else {
builder = new AlertDialog.Builder(getApplicationContext());
}
builder.setTitle("Delete entry")
.setMessage("Are you sure you want to delete this entry?")
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//You want yes
}
})
.setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//You want no
}
})
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
}
};
你可以这样做
//onCancel Clicked
if(somethingChanged)//compare old values with new values
showDialog();
else
onBackPressed();
创建一个 boolean 变量来跟踪 textChange
boolean isDirty;
TextWatcher edittw = 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) {
Toast.makeText(EditContact.this, "change detected", Toast.LENGTH_SHORT).show();
isDirty = true;
}
};
categoryname.addTextChangedListener(edittw);
namename.addTextChangedListener(edittw);
phonename.addTextChangedListener(edittw);
addressname.addTextChangedListener(edittw);
commentname.addTextChangedListener(edittw);
并将取消按钮点击事件改成这个
private void cancelButton() {
cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(isDirty) {
//add a dialogue box
AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext());
builder.setMessage("Save changes you made?").setPositiveButton("Yes", dialogClickListener)
.setNegativeButton("No", dialogClickListener).show();
}
else {
// this will finish the current activity and the last activity will be popped from the stack.
finish();
}
}
});
}
在取消按钮的 onClick 方法中试试这个:-
@Override
onClick(View v) {
if(!(categoryname.getText().toString().isEmpty() && namename.getText().toString().isEmpty() && phonename.getText().toString().isEmpty() && addressname.getText().toString().isEmpty() && commentname.getText().toString().isEmpty())) {
// show your dialog
}
else {
// normal cancel
}
所有edittexts中只有check the text，如果其中任何一个不为空，则显示对话框..!!
No need to add textChangeListener for the above problem !!
你只需像这样使用布尔变量
在 class 属性中声明检查变量
布尔检查；
将onTextChange()中的这个变量的值设置为TextWatcher
true
将cancelButton()改成这个
private void cancelButton() {
cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(changed){
AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext());
builder.setMessage("Save changes you made?").setPositiveButton("Yes", dialogClickListener)
.setNegativeButton("No", dialogClickListener).show();
}else {
Log.v(TAG,"nothing changed ");
}
}
});
}
我有一个 activity 和几个 EditTexts。如果用户单击“Cancel”按钮并且这些 EditTexts 中没有任何变化，那么应用程序应该转到之前的 activity 但如果这些 EditTexts 中有任何变化，那么我希望用户看到 AlertDialog:
Save changes you made?
NO YES
我已经为这些EditTexts设置了一个TextWatcher，例如：
//let's set up a textwatcher so if the state of any of the edittexts has changed.
//if it has changed and user clicks 'CANCEL', we'll ask first, '
//You've made changes here. Sure you want to cancel?'
TextWatcher edittw = 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) {
Toast.makeText(EditContact.this, "change detected", Toast.LENGTH_SHORT).show();
}
};
categoryname.addTextChangedListener(edittw);
namename.addTextChangedListener(edittw);
phonename.addTextChangedListener(edittw);
addressname.addTextChangedListener(edittw);
commentname.addTextChangedListener(edittw);
还有我的 AlertDialog 用于 Cancel 按钮 - 无论任何 EditTexts 是否已更改，它都会出现，但我只希望它仅在进行更改时出现在 EditTexts 中，否则不应该有 AlerDialog，当前的 activity 应该回到之前的 activity - 就像：
private void cancelButton() {
cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//add a dialogue box
AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext());
builder.setMessage("Save changes you made?").setPositiveButton("Yes", dialogClickListener)
.setNegativeButton("No", dialogClickListener).show();
}
});
}
//Are you sure you want to cancel? dialogue
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which){
case DialogInterface.BUTTON_POSITIVE:
//Yes button clicked
pDialog = new ProgressDialog(EditContact.this);
// Showing progress dialog for the review being saved
pDialog.setMessage("Saving...");
pDialog.show();
//post the review_id in the current activity to EditContact.php and
StringRequest stringRequest = new StringRequest(Request.Method.POST, EditContact_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
//hide the dialogue saying 'Saving...' when page is saved
pDialog.dismiss();
Toast.makeText(EditContact.this, response, Toast.LENGTH_LONG).show();
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(EditContact.this, "problem here", Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
//we are posting review_id into our EditContact.php file,
//the second value, review_id,
// is the value we get from Android.
// When we see this in our php, $_POST["review_id"],
//put in the value from Android
params.put("review_id", review_id);
return params;
}
};
AppController.getInstance().addToRequestQueue(stringRequest);
//when cancelled, back to the PopulistoListView class
Intent j = new Intent(EditContact.this,PopulistoListView.class);
startActivity(j);
break;
case DialogInterface.BUTTON_NEGATIVE:
//close the activity
finish();
}
}
};
我在互联网上搜索了包含 'TextWatcher' 和 'AlertDialog' 等短语的教程或帖子，但我没有找到可以帮助我实现我想要做的事情的东西。
尝试像下面这样添加 alertDialog，你可以将对话框放在 onAfterChange 方法中：
TextWatcher edittw = 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) {
Toast.makeText(EditContact.this, "change detected", Toast.LENGTH_SHORT).show();
AlertDialog.Builder builder;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
builder = new AlertDialog.Builder(getApplicationContext(), android.R.style.Theme_Material_Dialog_Alert);
} else {
builder = new AlertDialog.Builder(getApplicationContext());
}
builder.setTitle("Delete entry")
.setMessage("Are you sure you want to delete this entry?")
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//You want yes
}
})
.setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//You want no
}
})
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
}
};
你可以这样做
//onCancel Clicked
if(somethingChanged)//compare old values with new values
showDialog();
else
onBackPressed();
创建一个 boolean 变量来跟踪 textChange
boolean isDirty;
TextWatcher edittw = 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) {
Toast.makeText(EditContact.this, "change detected", Toast.LENGTH_SHORT).show();
isDirty = true;
}
};
categoryname.addTextChangedListener(edittw);
namename.addTextChangedListener(edittw);
phonename.addTextChangedListener(edittw);
addressname.addTextChangedListener(edittw);
commentname.addTextChangedListener(edittw);
并将取消按钮点击事件改成这个
private void cancelButton() {
cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(isDirty) {
//add a dialogue box
AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext());
builder.setMessage("Save changes you made?").setPositiveButton("Yes", dialogClickListener)
.setNegativeButton("No", dialogClickListener).show();
}
else {
// this will finish the current activity and the last activity will be popped from the stack.
finish();
}
}
});
}
在取消按钮的 onClick 方法中试试这个:-
@Override
onClick(View v) {
if(!(categoryname.getText().toString().isEmpty() && namename.getText().toString().isEmpty() && phonename.getText().toString().isEmpty() && addressname.getText().toString().isEmpty() && commentname.getText().toString().isEmpty())) {
// show your dialog
}
else {
// normal cancel
}
所有edittexts中只有check the text，如果其中任何一个不为空，则显示对话框..!!
No need to add
textChangeListenerfor the above problem !!
你只需像这样使用布尔变量
在 class 属性中声明检查变量
布尔检查；
将
onTextChange()中的这个变量的值设置为TextWatcher中的将
cancelButton()改成这个private void cancelButton() { cancel.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if(changed){ AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext()); builder.setMessage("Save changes you made?").setPositiveButton("Yes", dialogClickListener) .setNegativeButton("No", dialogClickListener).show(); }else { Log.v(TAG,"nothing changed "); } } }); }
true