当按下QuickAction中的按钮时，我试图显示AlertDialog。但是我的应用程序在尝试完成此任务时崩溃了。我不知道导致错误的原因。我还尝试使用Thread.sleep给时间QuickAction正确地进行调整并显示AlertDialog，但它没有用。
我做了研究，发现了一个问题：Starting Dialog from QuickAction Button
这个问题有点类似于我的但是当我试图用MyClass.class替换getApplicationContext（）时，我得到一个错误，说构造函数AlertDialog.builder（Class）是未定义的。
以下是一段代码QuickAction和AlertDialog：
ActionItem editQItem = new ActionItem(ID_EDIT_Q, "Edit", getResources()
.getDrawable(R.drawable.qa_edit));
ActionItem deleteQItem = new ActionItem(ID_DELETE_Q, "Delete",
getResources().getDrawable(R.drawable.qa_delete_answer));
System.out.println("Blah 1");
mQuickActionQ = new QuickAction(this);
mQuickActionQ.addActionItem(editQItem);
mQuickActionQ.addActionItem(deleteQItem);
System.out.println("Blah 2");
// setup the action item click listener
mQuickActionQ
.setOnActionItemClickListener(new QuickAction.OnActionItemClickListener() {
public void onItemClick(QuickAction quickAction, int pos,
int actionId) {
ActionItem actionItem = quickAction.getActionItem(pos);
System.out.println("Blah 3");
if (actionId == ID_EDIT_Q) {
//Here im getting error from here onwards when trying to display AlertDialog
et_question = new EditText(getApplicationContext());
et_tag1 = new EditText(getApplicationContext());
et_tag2 = new EditText(getApplicationContext());
et_tag3 = new EditText(getApplicationContext());
et_question.setText(question);
et_tag1.setText(q_tag1);
et_tag2.setText(q_tag2);
et_tag3.setText(q_tag3);
tv_question = new TextView(getApplicationContext());
tv_question.setText("Question:");
tv_question.setTextSize(15);
tv_tags = new TextView(getApplicationContext());
tv_tags.setText("Tags:");
tv_tags.setTextSize(15);
ll_edit = new LinearLayout(getApplicationContext());
ll_edit.setOrientation(1);
ll_edit.addView(tv_question);
ll_edit.addView(et_question);
ll_edit.addView(tv_tags);
ll_edit.addView(et_tag1);
ll_edit.addView(et_tag2);
ll_edit.addView(et_tag3);
AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());
builder.setMessage("Edit");
builder.setCancelable(true);
builder.setView(ll_edit);
builder.setPositiveButton("Save Changes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
boolean Success = true;
Editable ttv = et_question.getText();
final String answer = new StringBuilder().append(
ttv).toString();
if (answer.equals("")) {
Dialog mTag = new Dialog(
getApplicationContext());
mTag.setTitle("One of the field is empty!");
TextView tv2 = new TextView(
getApplicationContext());
tv2.setText("Blank fields are not allowed.");
mTag.setContentView(tv2);
mTag.setCancelable(true);
mTag.show();
} else {
String uname = qun.getText().toString();
String question = qu.getText().toString();
String question_time = qpo.getText().toString();
String new_question = et_question.getText()
.toString();
String new_tag1 = et_tag1.getText().toString();
String new_tag2 = et_tag2.getText().toString();
String new_tag3 = et_tag3.getText().toString();
uf = new UserFunctions();
HashMap<String, String> hm = new HashMap<String, String>();
db = new DatabaseHandler(
getApplicationContext());
db.getReadableDatabase();
hm = db.getUserDetails();
db.close();
String username = hm.get("username");
JSONObject json = uf.updateQuestion(username,
question, question_time, new_question,
new_tag1, new_tag2, new_tag3);
dialog.dismiss();
pd = ProgressDialog.show(ViewMyQuestion.this,
"Please wait...",
"Updating your question!", true, false);
Thread thread = new Thread(ViewMyQuestion.this);
thread.start();
tagcombo = new_tag1 + "," + new_tag2 + ","
+ new_tag3;
qun.setText(username);
qtag.setText(tagcombo);
qu.setText(new_question);
}// end of if else
}
});
builder.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
} else {
System.out.println("Blah 4");
Toast.makeText(getApplicationContext(),
actionItem.getTitle() + " selected",
Toast.LENGTH_SHORT).show();
}
}
});
mQuickActionQ.setOnDismissListener(new QuickAction.OnDismissListener() {
public void onDismiss() {
Toast.makeText(getApplicationContext(), "Ups..dismissed",
Toast.LENGTH_SHORT).show();
}
});
以下是Logcat消息：
07-05 18:01:27.158: E/AndroidRuntime(389): FATAL EXCEPTION: main
07-05 18:01:27.158: E/AndroidRuntime(389): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
07-05 18:01:27.158: E/AndroidRuntime(389): at android.view.ViewRoot.setView(ViewRoot.java:509)
07-05 18:01:27.158: E/AndroidRuntime(389): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
07-05 18:01:27.158: E/AndroidRuntime(389): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
07-05 18:01:27.158: E/AndroidRuntime(389): at android.app.Dialog.show(Dialog.java:241)
07-05 18:01:27.158: E/AndroidRuntime(389): at com.vervecoders.cuqu.ViewMyQuestion$3.onItemClick(ViewMyQuestion.java:222)
07-05 18:01:27.158: E/AndroidRuntime(389): at com.vervecoders.cuqu.QuickAction$2.onClick(QuickAction.java:162)
07-05 18:01:27.158: E/AndroidRuntime(389): at android.view.View.performClick(View.java:2408)
07-05 18:01:27.158: E/AndroidRuntime(389): at android.view.View$PerformClick.run(View.java:8816)
07-05 18:01:27.158: E/AndroidRuntime(389): at android.os.Handler.handleCallback(Handler.java:587)
07-05 18:01:27.158: E/AndroidRuntime(389): at android.os.Handler.dispatchMessage(Handler.java:92)
07-05 18:01:27.158: E/AndroidRuntime(389): at android.os.Looper.loop(Looper.java:123)
07-05 18:01:27.158: E/AndroidRuntime(389): at android.app.ActivityThread.main(ActivityThread.java:4627)
07-05 18:01:27.158: E/AndroidRuntime(389): at java.lang.reflect.Method.invokeNative(Native Method)
07-05 18:01:27.158: E/AndroidRuntime(389): at java.lang.reflect.Method.invoke(Method.java:521)
07-05 18:01:27.158: E/AndroidRuntime(389): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
07-05 18:01:27.158: E/AndroidRuntime(389): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
07-05 18:01:27.158: E/AndroidRuntime(389): at dalvik.system.NativeStart.main(Native Method)
谢谢
答案 0 :(得分：2)
尝试AlertDialog.Builder builder = new AlertDialog.Builder(yourActivityName.this);而不是AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());