Android 向UI动态添加元素数组

我正在尝试向LinearLayout UI添加元素，该UI已在片段的onCreateView（）方法中成功扩展

下面是onActivityCreated（）方法，我试图在其中向UI添加更多元素

UI为体积计算提供输入，但我不知道在运行时计算体积需要多少维度。尺寸的数量由我的体积计算类根据calcId提供

调试时，只要我尝试在dimHLayouts[dimNumber]（例如dimHLayouts[dimNumber].setId（100+dimNumber）；）上设置任何内容，应用程序就会在for循环中崩溃。我已尝试交换我首先设置的属性。无论我首先尝试设置哪个属性，只要我尝试设置属性，就会发生此崩溃

我还使用了android.util.Log工具，插入了一吨日志，试图看看发生了什么，但我仍然不知所措，因为到那时为止，一切似乎都在按预期进行。任何帮助都将不胜感激

@Override
public void onActivityCreated(Bundle savedInstanceState) {

    // Get the volume Calculation Type from the bundle passed to this fragment
    Bundle bundle = this.getArguments();
    int calcId = bundle.getInt("CalcType");

    // Create a calculation object
    VolumeCalculation calc = new VolumeCalculation(ApplicationContextProvider.getContext());
    int calcDimensionCount = calc.getCalcDimensionCount(calcId);

    // Get the root LinearLayout of the inflated UI
    LinearLayout inputUILayout = (LinearLayout)view.findViewById(R.id.layout_input);

    // Create array of new LinearLayout objects
    LinearLayout[] dimHLayouts = new LinearLayout[calc.getCalcDimensionCount(calcId)];
    LinearLayout.LayoutParams lpDimHLayouts = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);

    // Create array of new TextView objects
    TextView[] dimTextViews = new TextView[calc.getCalcDimensionCount(calcId)];
    LayoutParams lpDimTextViews = new LinearLayout.LayoutParams(0, LayoutParams.WRAP_CONTENT, 1f);

    for(int dimNumber=0; dimNumber<calcDimensionCount; dimNumber++) {

        // Setup the horizontal linear layout for the dimension
        dimHLayouts[dimNumber].setId(100 + dimNumber);
        dimHLayouts[dimNumber].setOrientation(android.widget.LinearLayout.HORIZONTAL);
        dimHLayouts[dimNumber].setLayoutParams(lpDimHLayouts);

        // Setup the dimension label TextView
        dimTextViews[dimNumber].setId(150 + dimNumber);
        dimTextViews[dimNumber].setLayoutParams(lpDimTextViews);
        dimTextViews[dimNumber].setGravity(Gravity.RIGHT);
        dimTextViews[dimNumber].setText(calc.getDimLabel(calcId, dimNumber));

        // Add TextView to LinearLayout
        dimHLayouts[dimNumber].addView(dimTextViews[dimNumber]);

        // To Do: Setup an EditText and add it to the dimension LinearLayout

        // Add dimension LinearLayout to the UI  
        inputUILayout.addView(dimHLayouts[dimNumber]);
    }

    super.onActivityCreated(savedInstanceState);
}

@覆盖
已创建ActivityState上的公共无效（Bundle savedInstanceState）{
//从传递到此片段的包中获取体积计算类型
Bundle=this.getArguments（）；
int calcId=bundle.getInt（“CalcType”）；
//创建计算对象
VolumeCalculation calc=新的VolumeCalculation（ApplicationContextProvider.getContext（））；
int calcDimensionCount=calc.getCalcDimensionCount（calcId）；
//从膨胀的UI中获取根线性布局
LinearLayout inputUILayout=（LinearLayout）视图.findViewById（R.id.layout\u输入）；
//创建新LinearLayout对象的数组
LinearLayout[]dimHLayouts=新的LinearLayout[calc.getCalcDimensionCount（calcId）]；
LinearLayout.LayoutParams lpDimHLayouts=新的LinearLayout.LayoutParams（LayoutParams.MATCH\u父级，LayoutParams.WRAP\u内容）；
//创建新TextView对象的数组
TextView[]dimTextViews=新的TextView[calc.getCalcDimensionCount（calcId）]；
LayoutParams lpDimTextViews=新的LinearLayout.LayoutParams（0，LayoutParams.WRAP_内容，1f）；
对于（int dimNumber=0；dimNumber我有一个问题的解决方案（感谢Boris Mocialov的帮助）

新的UI组件数组已实例化，但数组的各个元素未初始化

我更改了for循环，如下所示，以初始化每个元素，例如
DIMHLayout[dimNumber]=newlinearlayout（getActivity（））；
它现在工作正常

    for(int dimNumber=0; dimNumber<calcDimensionCount; dimNumber++) {

        // Setup the horizontal linear layout for the dimension
        dimHLayouts[dimNumber] = new LinearLayout(getActivity());
        dimHLayouts[dimNumber].setOrientation(android.widget.LinearLayout.HORIZONTAL);
        dimHLayouts[dimNumber].setLayoutParams(lpDimHLayouts);

        // Setup the dimension label TextView
        dimTextViews[dimNumber] = new TextView(getActivity());
        textViewIds[dimNumber] = generateViewId();
        dimTextViews[dimNumber].setId(textViewIds[dimNumber]);
        dimTextViews[dimNumber].setLayoutParams(lpDimTextViews);
        dimTextViews[dimNumber].setGravity(Gravity.RIGHT);
        dimTextViews[dimNumber].setTextAppearance(getActivity(), android.R.attr.textAppearanceMedium);
        dimTextViews[dimNumber].setText(calc.getDimLabel(calcId, dimNumber));

        // Setup the dimension label EditText
        dimEditTexts[dimNumber] = new EditText(getActivity());
        editTextIds[dimNumber] = generateViewId();
        dimEditTexts[dimNumber].setId(editTextIds[dimNumber]);
        dimEditTexts[dimNumber].setLayoutParams(lpDimEditTexts);
        dimEditTexts[dimNumber].setInputType(InputType.TYPE_NUMBER_FLAG_DECIMAL | InputType.TYPE_CLASS_NUMBER);
        dimEditTexts[dimNumber].setTextAppearance(getActivity(), android.R.attr.textAppearanceMediumInverse);


        // Add TextView and EditText to LinearLayout
        dimHLayouts[dimNumber].addView(dimTextViews[dimNumber]);
        dimHLayouts[dimNumber].addView(dimEditTexts[dimNumber]);


        // Add dimension LinearLayout to the UI  
        inputUILayout.addView(dimHLayouts[dimNumber]);
    }

for（int-dimNumber=0；dimNumberwhat是崩溃报告？LogCat说，“线程以未捕获的异常退出”是的，它总是这么说。（她是这么说的）。稍微高一点，什么类型的异常，在代码中的什么位置。例如--classcastexception我没有看到像“由……引起的”这样明显的东西顺便说一句，谢谢你花时间看我的问题。是的，你的Fragment_Input.java第100行有NullPointerException