Question

为什么它一直抛出这个指针异常 - 我假设自定义布局没有问题。有人会告诉我，我在onCreate方法中定义的textview有什么问题。是的，正在阅读文本文件中的Recall按钮并调用分析数据的方法，但我正在努力同时在textview中显示结果。这有什么不对？我阻止了用户界面吗？提前谢谢你，我知道..所以不要告诉我Nullpointer是一个反复的问题。最好

 TextView Peaks_num;
  @overide
  onCreate(){
   .....
   .....
 //Read data.
    Recall = (Button) findViewById(R.id.Recall);
    Recall.setOnClickListener(new View.OnClickListener() {
        StringBuilder stringBuilder = new StringBuilder();

         String line = null;

        @Override
        public void onClick(View v) {
             List<Integer> List_Of_Peaks = findPeaks(String_TO_List);
            Dialog mdialog = new Dialog(MainActivity.this);
            mdialog.setTitle("MyDialog");
            mdialog.setContentView(R.layout.customdialog);
            mdialog.show();
             Peaks_num = (TextView) findViewById(R.id.Peak_Num);

             Peaks_num.setText(String.valueOf(List_Of_Peaks));


          }
        });



   //my custom layout that should to be for the textview inside the dialog. 
      <?xml version="1.0" encoding="utf-8"?>
     <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">


<TextView
    android:id="@+id/Peak_Num"
    android:layout_width="wrap_content"
    android:layout_height="100dp"
    android:layout_gravity="center_horizontal"
    android:layout_marginBottom="1.7dp"
    android:background="@drawable/back"
    android:text="Peaks"
    android:textColor="#040307" />

<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:text="@string/textView_Peaks_index"
        android:id="@+id/text_Index"
        android:layout_weight="1" />

  </LinearLayout>

尝试将变量传递给textView - PointerException

0 个答案: