Question

我有一个菜单按钮，当我点击它时，它会将一些数据发送到云端。在发送数据时，我会显示一个进度对话框。每件事情都很顺利，看起来很好，我可以按下按钮多次，数据被正确发送到云端。但是当我退出活动时，我得到一个错误，说有一个窗口泄漏：

com.android.internal.policy.impl.PhoneWindow$DecorView{4321fd38 V.E..... R......D 0,0-1026,288} that was originally added here

＆＃34; here＆＃34;指的是当我给进度对话框留意时。

这是我的代码：

 @Override
public boolean onOptionsItemSelected(MenuItem item) {
progressDialog = ProgressDialog.show(CruiseDetailRollCallActivity.this, "", "Loading...", true);//set up & show progress dialog

switch(item.getItemId()){
case R.id.menu_roll_call_opt_in:
    //saveing something into Parse -- (a database online, check Parse.com if you want more info, but just treat this like I am saving something into the cloud)
    currentUser.put("somethingBoolean", false); 
    currentUser.saveInBackground(new SaveCallback(){

    @Override
    public void done(ParseException e) { //once data has been put into the cloud
        progressDialog.dismiss();//dismiss the dialog
        supportInvalidateOptionsMenu();//refreshes the options menu
    }
    });

    return true;

default:
    return super.onOptionsItemSelected(item);
}
}

我应该提一下，这不是崩溃我的应用程序而只是显示错误。我不知道为什么会这样，我觉得我不应该忽视它。

编辑：发现我的错误。它失败了，因为作品是因为我正在回击动作栏并且会创建进度对话框，但从未被解雇，因为它只是在完成的代码中被解雇。

Answer 1

我的猜测是，当您将currentUser传递给CruiseDetailRollCallActivity时，您将活动泄露到currentUser.saveInBackground(new SaveCallback()...对象中。您刚刚创建的SaveCallback类具有对Activity的强引用。即使退出方法，它也永远不会被垃圾回收。你应该使用WeakReference然后它可以被垃圾收集。

WeakReference<CruiseDetailRollCallActivity> weakRef = new WeakReference<CruiseDetailRollCallActivity>(CruiseDetailRollCallActivity.this)

然后，将weakRef传递给ProgressDialog构造函数：

progressDialog = ProgressDialog.show(weakRef.get(), "", "Loading...", true);

每当你在Android中传递Context时，检查你是否需要WeakReference以便它可以被垃圾收集。泄漏整个应用程序很容易。

Answer 2

失败了，因为作品是因为我回击了动作栏并且会创建进度对话框，但从未被解雇，因为它只是在完成的代码中被解雇。

我搬了

progressDialog = ProgressDialog.show(CruiseDetailRollCallActivity.this, "", "Loading...", true);//set up & show progress dialog

进入

case R.id.menu_roll_call_opt_in:
//saveing something into Parse -- (a database online, check Parse.com if you want more info, but just treat this like I am saving something into the cloud)
currentUser.put("somethingBoolean", false); 
currentUser.saveInBackground(new SaveCallback(){

@Override
public void done(ParseException e) { //once data has been put into the cloud
    progressDialog.dismiss();//dismiss the dialog
    supportInvalidateOptionsMenu();//refreshes the options menu
}
});

return true;

所以看起来像这样

case R.id.menu_roll_call_opt_in:
progressDialog = ProgressDialog.show(CruiseDetailRollCallActivity.this, "", "Loading...", true);//set up & show progress dialog
//saveing something into Parse -- (a database online, check Parse.com if you want more info, but just treat this like I am saving something into the cloud)
currentUser.put("somethingBoolean", false); 
currentUser.saveInBackground(new SaveCallback(){

@Override
public void done(ParseException e) { //once data has been put into the cloud
    progressDialog.dismiss();//dismiss the dialog
    supportInvalidateOptionsMenu();//refreshes the options menu
}
});

return true;

调用dismiss后，进度对话框出现泄漏窗口错误

2 个答案: