android - カスタムビューの拡張中にエラーが発生しました

Question

キャンバスに円グラフを描画している円グラフカスタムビューがあります。

フラグメント内のアクティビティから円グラフの値を送信しています。

しかし、円グラフを膨らませる際にエラーが発生します。あらゆる種類の対策を試しましたが、適切な解決策を見つけることができませんでした

私の活動は...

public class PieChart extends View {
    float valuesForDrawing[];
    float valuesForDisplay[];
    // private float[] values,valuesForDisplay = new float[] {};
    ArrayList<ViewWasTouchedListener> listeners = new ArrayList<ViewWasTouchedListener>();

    public void setWasTouchedListener(ViewWasTouchedListener listener) {
        listeners.add(listener);
    }

    private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    private float[] value_degree;
    private float[] value_degree_for_display;
    private float[] angle_list;
    private int[] COLORS = { Color.BLUE, Color.GREEN, Color.MAGENTA,
            Color.CYAN, Color.RED };
    RectF rectf = new RectF(36, 48, 325, 330);
    int temp = 0;

    public PieChart(Context context, float[] values) {

        super(context);

        valuesForDrawing = calculateData(values);
        value_degree = new float[valuesForDrawing.length];
        for (int i = 0; i < values.length; i++) {
            value_degree[i] = values[i];

        }

        valuesForDisplay = calculateDataForDisplay(values);
        value_degree_for_display = new float[valuesForDisplay.length];
        for (int i = 0; i < values.length; i++) {
            value_degree_for_display[i] = values[i];

        }

    }

    public PieChart(Context context, AttributeSet attrs, float[] values) {
        super(context, attrs);
        valuesForDrawing = calculateData(values);
        value_degree = new float[valuesForDrawing.length];
        for (int i = 0; i < values.length; i++) {
            value_degree[i] = values[i];

        }

        valuesForDisplay = calculateDataForDisplay(values);
        value_degree_for_display = new float[valuesForDisplay.length];
        for (int i = 0; i < values.length; i++) {
            value_degree_for_display[i] = values[i];

        }

    }

    public PieChart(Context context, AttributeSet attrs, int defStyle,
            float[] values) {

        super(context, attrs, defStyle);
        valuesForDrawing = calculateData(values);
        value_degree = new float[valuesForDrawing.length];
        for (int i = 0; i < values.length; i++) {
            value_degree[i] = values[i];

        }

        valuesForDisplay = calculateDataForDisplay(values);
        value_degree_for_display = new float[valuesForDisplay.length];
        for (int i = 0; i < values.length; i++) {
            value_degree_for_display[i] = values[i];

        }
    }

    /*
     * public void setChartData(float[] datapoints) { this.values =
     * datapoints.clone(); this.valuesForDisplay = datapoints.clone();
     * invalidate(); }
     */

    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        super.onDraw(canvas);

        for (int i = 0; i < value_degree.length; i++) {// values2.length; i++) {
            if (i == 0) {
                paint.setColor(COLORS[i]);
                canvas.drawArc(rectf, 0, value_degree[i], true, paint);
            } else {
                temp += (int) value_degree[i - 1];
                paint.setColor(COLORS[i]);
                canvas.drawArc(rectf, temp, value_degree[i], true, paint);
            }
        }

        for (ViewWasTouchedListener listener : listeners) {
            listener.onViewDrawn(value_degree_for_display, COLORS);
        }

    }

    private float[] calculateData(float[] data) {
        // TODO Auto-generated method stub
        float total = 0;
        // float x=0;
        for (int i = 0; i < data.length; i++) {
            total += data[i];
        }
        for (int i = 0; i < data.length; i++) {
            data[i] = 360 * (data[i] / total);
            // x=x+data[i];
        }
        return data;

    }

    private float[] calculateDataForDisplay(float[] data) {
        // TODO Auto-generated method stub
        float total = 0;
        float x = 0;
        for (int i = 0; i < data.length; i++) {
            total += data[i];
        }
        for (int i = 0; i < data.length; i++) {
            data[i] = 360 * (data[i] / total);
            x = x + data[i];
            data[i] = x;
        }
        return data;

    }

    public float[] getValuesForDrawing() {
        return valuesForDrawing;
    }

    public void setValuesForDrawing(float[] valuesForDrawing) {
        this.valuesForDrawing = valuesForDrawing;
    }

    public float[] getValuesForDisplay() {
        return valuesForDisplay;
    }

    public void setValuesForDisplay(float[] valuesForDisplay) {
        this.valuesForDisplay = valuesForDisplay;
    }

    public ArrayList<ViewWasTouchedListener> getListeners() {
        return listeners;
    }

    public void setListeners(ArrayList<ViewWasTouchedListener> listeners) {
        this.listeners = listeners;
    }

    public Paint getPaint() {
        return paint;
    }

    public void setPaint(Paint paint) {
        this.paint = paint;
    }

    public float[] getValue_degree() {
        return value_degree;
    }

    public void setValue_degree(float[] value_degree) {
        this.value_degree = value_degree;
    }

    public float[] getValue_degree_for_display() {
        return value_degree_for_display;
    }

    public void setValue_degree_for_display(float[] value_degree_for_display) {
        this.value_degree_for_display = value_degree_for_display;
    }

    public float[] getAngle_list() {
        return angle_list;
    }

    public void setAngle_list(float[] angle_list) {
        this.angle_list = angle_list;
    }

    public int[] getCOLORS() {
        return COLORS;
    }

    public void setCOLORS(int[] cOLORS) {
        COLORS = cOLORS;
    }

    public RectF getRectf() {
        return rectf;
    }

    public void setRectf(RectF rectf) {
        this.rectf = rectf;
    }

    public int getTemp() {
        return temp;
    }

    public void setTemp(int temp) {
        this.temp = temp;
    }

         }

私はこのステートメントからビューを呼び出しています..

 PieChart customView = new PieChart(getActivity(), values);

ここで、値は float[] = {2,7,8,9,..anything} です。

しかし、私はエラーが発生しています....

     08-19 16:50:12.389: E/AndroidRuntime(27669): FATAL EXCEPTION: main
08-19 16:50:12.389: E/AndroidRuntime(27669): android.view.InflateException: Binary XML file line #17: Error inflating class com.example.fragmentnewone.PieChart
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.view.LayoutInflater.createView(LayoutInflater.java:589)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:742)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at com.example.fragmentnewone.PieChartFragment.onCreateView(PieChartFragment.java:50)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:461)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.support.v4.view.ViewPager.populate(ViewPager.java:1011)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.support.v4.view.ViewPager.populate(ViewPager.java:880)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.support.v4.view.ViewPager$3.run(ViewPager.java:238)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.os.Handler.handleCallback(Handler.java:608)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.os.Handler.dispatchMessage(Handler.java:92)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.os.Looper.loop(Looper.java:156)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.app.ActivityThread.main(ActivityThread.java:5109)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at java.lang.reflect.Method.invokeNative(Native Method)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at java.lang.reflect.Method.invoke(Method.java:511)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:991)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:758)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at dalvik.system.NativeStart.main(Native Method)
08-19 16:50:12.389: E/AndroidRuntime(27669): Caused by: java.lang.NoSuchMethodException: <init> [class android.content.Context, interface android.util.AttributeSet]
08-19 16:50:12.389: E/AndroidRuntime(27669):    at java.lang.Class.getConstructorOrMethod(Class.java:460)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at java.lang.Class.getConstructor(Class.java:431)
08-19 16:50:12.389: E/AndroidRuntime(27669):    at android.view.LayoutInflater.createView(LayoutInflater.java:561)
08-19 16:50:12.389: E/AndroidRuntime(27669):    ... 26 more

編集コンストラクターを変更し、セッターメソッドを使用して値を設定しました

public void setValues(float[] values) {
    this.values = values;
}

しかし、私はエラーが発生しています

 08-20 11:35:02.685: E/ViewGroup(14994): ----- NullPointerException -----
08-20 11:35:02.685: E/ViewGroup(14994): mChildrenCount = 1, count = 1, i = 0, child = android.widget.LinearLayout@40f4e838, mEditChildren = false
08-20 11:35:02.685: E/ViewGroup(14994): idx = 0, child = android.widget.LinearLayout@40f4e838
08-20 11:35:02.685: E/ViewGroup(14994): ----- NullPointerException -----
08-20 11:35:02.685: E/ViewGroup(14994): mChildrenCount = 3, count = 3, i = 1, child = android.widget.FrameLayout@40f4d9b0, mEditChildren = false
08-20 11:35:02.685: E/ViewGroup(14994): idx = 0, child = com.android.internal.widget.ActionBarContainer@40f463c8
08-20 11:35:02.685: E/ViewGroup(14994): idx = 1, child = android.widget.FrameLayout@40f4d9b0
08-20 11:35:02.685: E/ViewGroup(14994): idx = 2, child = com.android.internal.widget.ActionBarContainer@40f4dd58
08-20 11:35:02.685: E/ViewGroup(14994): ----- NullPointerException -----
08-20 11:35:02.685: E/ViewGroup(14994): mChildrenCount = 1, count = 1, i = 0, child = android.widget.LinearLayout@40f45890, mEditChildren = false
08-20 11:35:02.685: E/ViewGroup(14994): idx = 0, child = android.widget.LinearLayout@40f45890

My xml is 
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@android:color/black">

    <RelativeLayout
    android:id="@+id/rel"
    android:layout_width="250dp"
    android:layout_height="250dp"
    android:layout_marginTop="50dp"
    android:layout_marginLeft="40dp"
    android:orientation="vertical"
    tools:context=".MainActivity" 
    android:background="#000000">

  <com.example.fragmentnewone.PieChart

      android:id="@+id/graphId"
      android:layout_width="match_parent"
      android:layout_height="match_parent">

    </com.example.fragmentnewone.PieChart>


    <ImageView
        android:src="@drawable/graphic_ring"
        android:id="@+id/imageView_ring"
        android:scaleType="matrix"
        android:layout_height="fill_parent"
        android:layout_width="fill_parent"> 

    </ImageView>

    <TextView
        android:id="@+id/textId"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="32dp"
        android:textStyle="bold"
         />

</RelativeLayout>
</RelativeLayout>

score 46 · Accepted Answer

Contextパラメータとパラメータだけを持つコンストラクタが必要ですAttributeSet。valuesパラメータが無効です。インフレート後にプログラムで値を設定する必要があります。

例：

public PieChart(Context context, AttributeSet attrs){
    super(context, attrs);
}

public void setValues(float[] values){
    // Do stuff calculating
}

android - カスタム ビューの拡張中にエラーが発生しました

4 に答える 4

Related

Reference

android - カスタムビューの拡張中にエラーが発生しました