在水平线延迟返回宽度和高度0中充气垂直线性布局

Question

我试图在一个自定义水平LinearLayout中夸大5个垂直LinearLayout。

首先，我使用LayoutInflater将XML掩盖到View。然后，我将垂直布局添加到水平面。

问题是在onMeasure中，我尝试设置孩子的宽度和高度垂直LinearLayout，但是当我要求getWidth和getHeight时，它总是返回0。

我真的不了解这种行为。

你能帮我吗？非常感谢。

垂直线胶的XML：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#000000" >
    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:text="Button"
        android:layout_weight="1" />
    <com.vuric.nativesampler.customviews.BandSeekBar
        android:id="@+id/bandSeek"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:layout_weight="8" 
        android:layout_gravity="center"/>
    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:text="Button" />
</LinearLayout>

集装箱的类水平线胶：

public class EqualizerCustomLayout extends LinearLayout {
    private static final int MARGIN = 4;
    private Context context;
    public EqualizerCustomLayout(Context context) {
        super(context);
        this.context = context;
        init();
    }
    public EqualizerCustomLayout(Context context, AttributeSet attrs,
            int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        this.context = context;
        init();
    }
    public EqualizerCustomLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
        init();
    }
    private void init() {
        setOrientation(LinearLayout.HORIZONTAL);
        setLayoutParams(new LinearLayout.LayoutParams(
                LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
        //getNumberOfBands is 5
        for (int i = 0; i < CustomApplicationClass.get().getNumberOfBands(); ++i) {
            LinearLayout linearLayout = (LinearLayout) inflate(context,
                    R.layout.slot_band_layout, null);
            addView(linearLayout);
        }
    }
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        Log.v("jajaja", "onMeasure children are " + getChildCount());
        int width = (CustomApplicationClass.get().getScreenSize().x / 100 * 45)
                + MARGIN * 2;
        int height = (CustomApplicationClass.get().getScreenSize().x / 100 * 45)
                + MARGIN * 2;
        LayoutParams params = new LinearLayout.LayoutParams(width / 5, width);
        for (int i = 0; i < getChildCount(); ++i) {
            LinearLayout layout = (LinearLayout) getChildAt(i);
            layout.setLayoutParams(new LinearLayout.LayoutParams(width
                    / getChildCount(), height));
            Log.v("jajaja",
                    "view" + i + " , w: " + layout.getWidth() + " , h: "
                            + layout.getHeight()); // always return 0 for both width and height
        }
        setMeasuredDimension(width, height);
    }
}

Answer 1

您必须等到实际绘制视图为止。可以在这里找到一个解决方法。