为什么我的应用程序崩溃？再添加一个微调器后，对话框将无法打开

Question

当我运行此void时，活动将重新启动，而是需要打开对话框。

无效：

AlertDialog.Builder mBuilder = new AlertDialog.Builder(Settings.this);
                        View mView = getLayoutInflater().inflate(R.layout.dialog_wedit, null);
                        mBuilder.setView(mView);
                        mBuilder.setTitle("Wilma custom URL");
                        mBuilder.setIcon(R.drawable.ic_wilma);
                        final Spinner mSpinner = mView.findViewById(R.id.editor_netprotocol); //Using mView because it doesn't exist in the main layout, but only in the custom layout (same under this line)
                        final Spinner mSpinner_mode = mView.findViewById(R.id.spinner_mode);
                        final EditText mEdittext = mView.findViewById(R.id.editor_url);
                        final String[] selects = new String[]{"https://", "http://"
                        };
                        final String[] selects2 = new String[]{"Default URL", "Custom URL"
                        };
                        ArrayAdapter<String> adapter = new ArrayAdapter<String>(context,
                                android.R.layout.simple_spinner_item, selects);
                        ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(context,
                                android.R.layout.simple_spinner_item, selects2);
                        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        mSpinner.setAdapter(adapter);
                        mSpinner_mode.setAdapter(adapter2);
                        final Boolean[] url_mode = {false};
                        SharedPreferences prefs = getSharedPreferences(getString(R.string.preference_file_key), MODE_PRIVATE);
                        Boolean url_mode_saved = prefs.getBoolean("wilmacustom", false);
                        if (url_mode_saved) {
                            mSpinner_mode.setSelection(2);
                            url_mode[0] = true;
                        } else {
                            mSpinner_mode.setSelection(1);
                            url_mode[0] = false;
                        }

                        final String[] url_protocol_selection = new String[1];


                        mSpinner_mode.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                            @Override
                            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                                switch (position) {
                                    case 1:
                                        url_mode[0] = false;
                                        break;
                                    case 2:
                                        url_mode[0] = true;
                                        break;
                                }
                            }

                            @Override
                            public void onNothingSelected(AdapterView<?> parent) {

                            }
                        });
                        mSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                            @Override
                            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                                url_protocol_selection[0] = mSpinner.getSelectedItem().toString();

                            }

                            @Override
                            public void onNothingSelected(AdapterView<?> parent) {

                            }
                        });
                        mBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                dialog.dismiss();
                            }
                        });
                        mBuilder.setPositiveButton("Apply", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                String finalURL = url_protocol_selection[0] + mEdittext.getText().toString();
                                SharedPreferences.Editor editor = getSharedPreferences(getString(R.string.preference_file_key), MODE_PRIVATE).edit();
                                editor.putString("wilmaurl", finalURL);
                                editor.putBoolean("wilmacustom", url_mode[0]);
                                editor.apply();
                                dialog.dismiss();
                            }
                        });
                        mBuilder.show();

对话框布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:padding="20dp">

    <Spinner
        android:id="@+id/spinner_mode"
        android:layout_width="348dp"
        android:layout_height="40dp" />

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/layout_editor">

        <Spinner
            android:id="@+id/editor_netprotocol"
            android:layout_width="143dp"
            android:layout_height="match_parent"
            android:layout_weight="1" />

        <EditText
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:inputType="textUri"
            android:hint="wilma.kunta.fi"
            android:id="@+id/editor_url"
            android:layout_weight="1" />

    </LinearLayout>

</LinearLayout>

日志：

07-25 21:21:12.513 6403-6403/com.developerfromjokela.edison E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.developerfromjokela.edison, PID: 6403
    java.lang.ArrayIndexOutOfBoundsException: length=2; index=2
        at java.util.Arrays$ArrayList.get(Arrays.java:3769)
        at android.widget.ArrayAdapter.getItem(ArrayAdapter.java:385)
        at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:441)
        at android.widget.ArrayAdapter.getView(ArrayAdapter.java:407)
        at android.widget.Spinner.makeView(Spinner.java:712)
        at android.widget.Spinner.layout(Spinner.java:660)
        at android.widget.Spinner.onLayout(Spinner.java:622)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.support.v7.widget.AlertDialogLayout.setChildFrame(AlertDialogLayout.java:347)
        at android.support.v7.widget.AlertDialogLayout.onLayout(AlertDialogLayout.java:340)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at com.android.internal.policy.DecorView.onLayout(DecorView.java:761)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2511)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2227)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1407)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6783)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:924)
        at android.view.Choreographer.doCallbacks(Choreographer.java:736)
        at android.view.Choreographer.doFrame(Choreographer.java:671)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:910)
        at android.os.Handler.handleCallback(Handler.java:790)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6499)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:440)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
07-25 21:21:12.513 6403-6403/com.developerfromjokela.edison E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.developerfromjokela.edison, PID: 6403
    java.lang.ArrayIndexOutOfBoundsException: length=2; index=2
        at java.util.Arrays$ArrayList.get(Arrays.java:3769)
        at android.widget.ArrayAdapter.getItem(ArrayAdapter.java:385)
        at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:441)
        at android.widget.ArrayAdapter.getView(ArrayAdapter.java:407)
        at android.widget.Spinner.makeView(Spinner.java:712)
        at android.widget.Spinner.layout(Spinner.java:660)
        at android.widget.Spinner.onLayout(Spinner.java:622)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.support.v7.widget.AlertDialogLayout.setChildFrame(AlertDialogLayout.java:347)
        at android.support.v7.widget.AlertDialogLayout.onLayout(AlertDialogLayout.java:340)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at com.android.internal.policy.DecorView.onLayout(DecorView.java:761)
        at android.view.View.layout(View.java:19659)
        at android.view.ViewGroup.layout(ViewGroup.java:6075)
        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2511)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2227)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1407)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6783)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:924)
        at android.view.Choreographer.doCallbacks(Choreographer.java:736)
        at android.view.Choreographer.doFrame(Choreographer.java:671)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:910)
        at android.os.Handler.handleCallback(Handler.java:790)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6499)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:440)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

该应用程序将显示带有2个微调框和一个编辑文本的对话框。使用一个微调器，对话框可以正常工作，而当我添加第二个微调器时，对话框将无法打开。

我无法理解它为什么崩溃。如果有人可以帮助我，非常感谢他。

Answer 1

看看您的堆栈跟踪的这一部分：

null

这意味着您的应用程序崩溃，因为您试图在Spinner元素中选择一个不存在的元素。请记住，微调器中列出的所有项目的索引都为0。

07-25 21:21:12.513 6403-6403/com.developerfromjokela.edison E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.developerfromjokela.edison, PID: 6403
    java.lang.ArrayIndexOutOfBoundsException: length=2; index=2