从非UI线程弹出一个Dialog

时间：2010-12-13 18:57:23

标签： android alertdialog android-inflate

我正在开发一个面向群组的网络应用。问题是，当我即将加入一个组时，它首先检查该组是否安全，如果是，它会询问用户和密码。获得组安全性可能需要几秒钟，因此我为整个过程生成了一个新线程。如果该组需要安全性，我想弹出一个Dialog。我认为它可能与后台线程有关，它们可能无法弹出Dialogs ......但问题是我需要检查后台线程中的组安全性，因为它需要一点时间。

希望任何人都可以提出解决方案或任何方式只在群组安全时询问用户/通行证。这是后台主题：

public void run() {

 secInf = mGroupId.getSecurityInformation();
 if (secInf.getAdmissionLevel() == CreateGroupDialog.PRIVATE_KEY_ACCESS) {
  showUserPasswordDialog();
 } else {
  mService.joinGroup(mGroupId);
  // Notifies handler to dismiss ProgresDialog and start activity
  mHandler.sendMessage(Message.obtain(mHandler,
      GroupsActivity.JOIN_SUCCESSFUL));
 }

showUserPasswordDialog的作用（mActivity是产生此线程的活动）：

 private void showUserPasswordDialog() {
  AlertDialog dialog;
  // add this to your code
  // This example shows how to add a custom layout to an AlertDialog
  LayoutInflater factory = LayoutInflater.from(mActivity);
  final View textEntryView = factory.inflate(
    R.layout.alert_dialog_text_entry, null);

  AlertDialog.Builder builder = new AlertDialog.Builder(mActivity);
  builder.setIcon(R.drawable.alert_dialog_icon);
  builder.setTitle(R.string.ask_user_password);
  builder.setView(textEntryView);
  builder.setPositiveButton(R.string.ok_text,
    new DialogInterface.OnClickListener() {
     public void onClick(DialogInterface dialog, int whichButton) {
      String userName = ((EditText) mActivity
        .findViewById(R.id.username_edit_alert_dialog))
        .getText().toString();
      String password = ((EditText) mActivity
        .findViewById(R.id.password_edit_alert_dialog))
        .getText().toString();
      Credentials cred = new CredentialsL1(userName, password);

      mSmeppService.joinGroup(mGroupId, cred);

      mHandler.sendMessage(Message.obtain(mHandler,
        GroupsActivity.JOIN_SUCCESSFUL));
    });
  builder.setNegativeButton(R.string.cancel_text,
    new DialogInterface.OnClickListener() {
     public void onClick(DialogInterface dialog, int whichButton) {
      dialog.cancel();
      mHandler.sendMessage(Message.obtain(mHandler,
        GroupsActivity.DISMISS_PROGRESS_DIALOG));
     }
    });

  dialog = builder.create();

  /* I found this somewhere, but didn't work either */
  // Window window = dialog.getWindow();
  // WindowManager.LayoutParams lp = window.getAttributes();
  // lp.token = textEntryView.getWindowToken();
  // lp.type = WindowManager.LayoutParams.TYPE_APPLICATION_ATTACHED_DIALOG;
  // window.setAttributes(lp);
  // window.addFlags(WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);

  dialog.show();

 }

我遇到了这个例外：

12-13 19:18:31.823: ERROR/AndroidRuntime(1702): FATAL EXCEPTION: Thread-38
12-13 19:18:31.823: ERROR/AndroidRuntime(1702): android.view.InflateException: Binary XML file line #17: Error inflating class android.widget.EditText
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.view.LayoutInflater.createView(LayoutInflater.java:513)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:618)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.view.LayoutInflater.inflate(LayoutInflater.java:407)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at org.pfc.threads.GroupJoinerThread.showUserPasswordDialog(GroupJoinerThread.java:76)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at org.pfc.threads.GroupJoinerThread.run(GroupJoinerThread.java:52)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702): Caused by: java.lang.reflect.InvocationTargetException
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.widget.EditText.<init>(EditText.java:51)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at java.lang.reflect.Constructor.constructNative(Native Method)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at java.lang.reflect.Constructor.newInstance(Constructor.java:446)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.view.LayoutInflater.createView(LayoutInflater.java:500)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     ... 8 more
12-13 19:18:31.823: ERROR/AndroidRuntime(1702): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.os.Handler.<init>(Handler.java:121)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.text.method.MetaKeyKeyListener$MetaKeyDropbackHandler.<init>(MetaKeyKeyListener.java:605)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.text.method.MetaKeyKeyListener.<init>(MetaKeyKeyListener.java:96)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.text.method.BaseKeyListener.<init>(BaseKeyListener.java:25)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.text.method.TextKeyListener.<init>(TextKeyListener.java:66)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.text.method.TextKeyListener.getInstance(TextKeyListener.java:83)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.widget.TextView.<init>(TextView.java:806)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     at android.widget.EditText.<init>(EditText.java:55)
12-13 19:18:31.823: ERROR/AndroidRuntime(1702):     ... 12 more

XML布局文件是：        

   <EditText
       android:id="@+id/username_edit_alert_dialog"
       android:enabled="false"
       android:layout_height="wrap_content"
       android:layout_width="fill_parent"
       android:layout_marginLeft="20dip"
       android:layout_marginRight="20dip"
       android:scrollHorizontally="true"
       android:autoText="false"
       android:capitalize="none"
       android:gravity="fill_horizontal"
       android:textAppearance="?android:attr/textAppearanceMedium" />
  <!-- Password -->
   <TextView
       android:id="@+id/password_view"
       android:layout_height="wrap_content"
       android:layout_width="wrap_content"
       android:layout_marginLeft="20dip"
       android:layout_marginRight="20dip"
       android:text="@string/password_view_text"
       android:gravity="left"
       android:textAppearance="?android:attr/textAppearanceMedium" />

   <EditText
       android:id="@+id/password_edit_alert_dialog"
       android:enabled="false"
       android:layout_height="wrap_content"
       android:layout_width="fill_parent"
       android:layout_marginLeft="20dip"
       android:layout_marginRight="20dip"
       android:scrollHorizontally="true"
       android:autoText="false"
       android:capitalize="none"
       android:gravity="fill_horizontal"
       android:password="true"
       android:textAppearance="?android:attr/textAppearanceMedium" />

3 个答案:

答案 0 :(得分：6)

您无法从后台线程执行UI操作。这样做的方法是使用已经实现的Handler来弹出对话框。如下所示：

private Handler handler = new Handler(){
    @Override
    public void handleMessage(Message msg) {
        switch(msg.what){
        case GroupsActivity.DISMISS_PROGRESS_DIALOG:
            //your existing dismiss code
            break;
        case GroupsActivity.CREATE_PROGRESS_DIALOG:
            //create the dialog
            break;
        }
    }
};

然后你的run方法是：

public void run() {

    secInf = mGroupId.getSecurityInformation();
    if (secInf.getAdmissionLevel() == CreateGroupDialog.PRIVATE_KEY_ACCESS) {
        // do stuff
        mHandler.sendMessage(Message.obtain(mHandler,
            GroupsActivity.CREATE_PROGRESS_DIALOG));
        // do more stuff
    } else {
        mService.joinGroup(mGroupId);
        // Notifies handler to dismiss ProgresDialog and start activity
        mHandler.sendMessage(Message.obtain(mHandler,
            GroupsActivity.JOIN_SUCCESSFUL));
    }
}

答案 1 :(得分：2)

你是对的。后台线程无法弹出对话框。您需要的是UI线程上的Handler，以便为您弹出对话框。

答案 2 :(得分：0)

尽管这样做不是一个好主意，并且此答案仅出于完整性考虑，但可以显示对话框形式的非UI线程。

handlerThread = HandlerThread("myHandlerThread")
handlerThread?.start()
handler1 = Handler(handlerThread?.looper)

handler1?.post {
    AlertDialog
        .Builder(this)
        .setPositiveButton("ok") { dialogInterface: DialogInterface, i: Int -> dialogInterface.dismiss() }
        .create()
        .show()
}
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