具有自定义布局的 DialogFragment 导致我的应用程序崩溃

Question

Dialog 片段有问题。带有我的自定义布局的简单对话框工作正常。但是我想在显示对话框时启动控件。我正在尝试在方法onActivityCreated 中执行此操作。但是getView()返回null，所以我想我必须在onCreateView而不是onCreateDialog中设置我的自定义视图。这里发生了错误。当我使用 onCreateView 时，我的应用程序崩溃了。这是我的代码：

class StatisticDialog extends DialogFragment {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the Builder class for convenient dialog construction
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder .setPositiveButton(getString(android.R.string.ok), new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                       // FIRE ZE MISSILES!
                   }
               });
        // Create the AlertDialog object and return it
        return builder.create();
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        return inflater.inflate(R.layout.statistics, container, true);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }
}

我在按钮点击活动时打开此对话框：

StatisticDialog dlg = new StatisticDialog(); 
dlg.show(getSupportFragmentManager(), "missiles");  

还有错误：

11-08 18:05:14.470: E/AndroidRuntime(1075): FATAL EXCEPTION: main
11-08 18:05:14.470: E/AndroidRuntime(1075): android.util.AndroidRuntimeException: requestFeature() must be called before adding content
11-08 18:05:14.470: E/AndroidRuntime(1075):     at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:215)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at com.android.internal.app.AlertController.installContent(AlertController.java:234)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at android.app.AlertDialog.onCreate(AlertDialog.java:336)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at android.app.Dialog.dispatchOnCreate(Dialog.java:351)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at android.app.Dialog.show(Dialog.java:256)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at android.support.v4.app.DialogFragment.onStart(DialogFragment.java:385)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at android.support.v4.app.Fragment.performStart(Fragment.java:1336)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:907)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1083)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:635)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1431)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:420)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at android.os.Handler.handleCallback(Handler.java:615)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at android.os.Handler.dispatchMessage(Handler.java:92)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at android.os.Looper.loop(Looper.java:137)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at android.app.ActivityThread.main(ActivityThread.java:4745)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at java.lang.reflect.Method.invokeNative(Native Method)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at java.lang.reflect.Method.invoke(Method.java:511)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-08 18:05:14.470: E/AndroidRuntime(1075):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

试试这个：

class StatisticDialog extends DialogFragment {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the Builder class for convenient dialog construction
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        LayoutInflater inflater = getActivity().getLayoutInflater();
        View view = inflater.inflate(R.layout.statistics, null);
        builder.setView(view);
        builder.setPositiveButton(getString(android.R.string.ok), new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                // FIRE ZE MISSILES!
            }
        });
        // Create the AlertDialog object and return it
        return builder.create();
    }
}

Answer 2

避免请求功能崩溃：

public class MyCombinedFragment extends DialogFragment
{
    private boolean isModal = false;

    public static MyCombinedFragment newInstance()
    {
        MyCombinedFragment frag = new MyCombinedFragment();
        frag.isModal = true; // WHEN FRAGMENT IS CALLED AS A DIALOG SET FLAG
        return frag;
    }

    public MyCombinedFragment()
    {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
    {
        if(isModal) // AVOID REQUEST FEATURE CRASH
        {
        return super.onCreateView(inflater, container, savedInstanceState);
        }
        else
        {
        View view = inflater.inflate(R.layout.fragment_layout, container, false);
        setupUI(view);
        return view;
        }
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState)
    {
        AlertDialog.Builder alertDialogBuilder = null;
        alertDialogBuilder = new AlertDialog.Builder(getActivity());
        View view = getActivity().getLayoutInflater().inflate(R.layout.fragment_layout, null);
        alertDialogBuilder.setView(view);
        alertDialogBuilder.setTitle(“Modal Dialog“);
        alertDialogBuilder.setPositiveButton("Cancel", new DialogInterface.OnClickListener()
        {
            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                dialog.dismiss();
            }
        });
        setupUI(view);
        return alertDialogBuilder.create();
    }
}

Answer 3

您应该使用灵活的 DialogFragment 将其设置为任何布局。 你应该按照这个步骤。也许它很复杂，但非常强大和灵活。更重要的是您的活动从 Dialogfragment 获取日期。

1- 创建一个实例类来监听并从您的活动中获取对话片段的日期。我将其命名为 OnMFDialogFragmentDoneListener.java。

2-创建您的 DialogFragment 并在 onCreateView 方法中定义您的布局，然后 3-在您的活动中使用您的课程和新方法

我创建一个 DialogFragment 来获取用户名和密码表单用户并将此日期传递给活动。对话框片段包含一个文本视图、两个 EditText 和两个按钮（登录和取消。但你可以使用任何东西。

第 1 步： OnMFDialogFragmentDoneListener.java

public interface OnMFDialogFragmentDoneListener {

public void onMFDialogFragmentDone(String tag,boolean cancelled,
                               CharSequence username,
                               CharSequence password);
}

必须在 DialogFragment 类中定义 onMFDialogFragmentDone 方法以向您的活动发送信息，并在您的活动中获取信息。（信息=用户在 DialogFragmetn 中键入的日期，如 txt 或其他）。

第二步 设计您的 DialogFragment 类。

  public class MFDialogFragment extends DialogFragment
    implements View.OnClickListener{


private EditText editTextusername,editTextpassword;

public static MFDialogFragment newInstance(String title){
    MFDialogFragment mfDialogFragment=new MFDialogFragment();

    Bundle bundle =new Bundle();
    bundle.putString("title",title);
    mfDialogFragment.setArguments(bundle);
    return mfDialogFragment;
}



@Override
public void onAttach(Activity act){

    try{
        OnMFDialogFragmentDoneListener
                test= (OnMFDialogFragmentDoneListener) act;
    }catch (ClassCastException cce){
        ////...activity !!!! not listen to me
    }
        super.onAttach(act);
}


@Override
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    this.setCancelable(true);
    int style = DialogFragment.STYLE_NORMAL, theme = 0;
    setStyle(style, theme);
}

public View onCreateView(LayoutInflater inflater,
                         ViewGroup container, Bundle bundle) {

        View v = inflater.inflate(R.layout.mfdialogfragmentlayout, container,
                false);

        TextView tvtitle = (TextView) v.findViewById(R.id.tv_dialogfragmentuserpass_title);
        tvtitle.setText(getArguments().getString("title"));

        editTextusername = (EditText) v.findViewById(R.id.et_dialogfragmentuserpass_username);
        editTextpassword = (EditText) v.findViewById(R.id.et_dialogfragmentuserpass_password);


        Button btnlogin = (Button) v.findViewById(R.id.btn_dialogfragmentuserpass_login);
        btnlogin.setOnClickListener(this);
        Button btncancel = (Button) v.findViewById(R.id.btn_dialogfragmentuserpass_cancel);
        btncancel.setOnClickListener(this);


    if(bundle!=null) {
        editTextpassword.setText(bundle.getCharSequence("SaveInstanceStatepassword"));
        editTextusername.setText(bundle.getCharSequence("SaveInstanceStateusername"));
    }






    return v;
}

@Override
public void onSaveInstanceState(Bundle icicle) {
    super.onSaveInstanceState(icicle);
    icicle.putCharSequence("SaveInstanceStatepassword", editTextpassword.getText());
    icicle.putCharSequence("SaveInstanceStateusername", editTextusername.getText());

}


public void onClick(View v)
{
    OnMFDialogFragmentDoneListener act = (OnMFDialogFragmentDoneListener)getActivity();
    if (v.getId() == R.id.btn_dialogfragmentuserpass_login)
    {

        act.onMFDialogFragmentDone(this.getTag(), false,
                editTextusername.getText(),editTextpassword.getText());
        dismiss();
        return;
    }
    if (v.getId() == R.id.btn_dialogfragmentuserpass_cancel)
    {
        act.onMFDialogFragmentDone(this.getTag(), true, "nousername", "nopass");
        dismiss();
        return;
    }


}
}

第 3 步 - 在活动中使用 DialogFragment 第一的 您添加代码“实现 OnMFDialogFragmentDoneListener” 像

这样的活动课程

public class MainActivity extends Activity
    implements OnMFDialogFragmentDoneListener

秒

public static final String 
PROMPT_MFDIALOGFRAGMENT_TAG="PROMPT_MFDIALOGFRAGMENT_TAG";

第三

定义获取输入到Dialogfragment的数据的方法

public  void  onMFDialogFragmentDone(String tag, boolean cancelled,
                                     CharSequence username,
                                     CharSequence password){
    String total;

    total=username.toString()+"...."+password.toString();
    Toast.makeText(this,total,Toast.LengthShort).show();
}

您的日期是用户名和密码 接下来是定义一个简单的方法来调用你的对话框

public void MFDialogFragmentShow(){
    FragmentTransaction ft = getFragmentManager().beginTransaction();
    MFDialogFragment mfDialogFragment =
            MFDialogFragment.newInstance("Login to your account");
    mfDialogFragment.show(ft, PROMPT_MFDIALOGFRAGMENT_TAG);

}

完成了。 你的片段布局 mfdialogfragmentlayout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Title"
    android:id="@+id/tv_dialogfragmentuserpass_title"/>
<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:hint="User Name"

    android:id="@+id/et_dialogfragmentuserpass_username"/>
<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:hint="Password"
    android:password="true"
    android:id="@+id/et_dialogfragmentuserpass_password"/>
<LinearLayout
    android:orientation="horizontal"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Login"
        android:id="@+id/btn_dialogfragmentuserpass_login"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Cancel"
        android:id="@+id/btn_dialogfragmentuserpass_cancel"/>


    </LinearLayout>
</LinearLayout>

Answer 4

DialogFragment 类中存在 getShowDialog() 方法。这是一个解释：developer.android.com

 if (!getShowsDialog()) {
            View rootView = inflater.inflate(R.layout.fr_layout, container, false);
            initViews(rootView);
            return rootView;
        } else {
            return super.onCreateView(inflater, container, savedInstanceState);
        }
    }