Android setMargins 无法以编程方式工作

Question

<RelativeLayout>\n\n    ...\n\n    <ImageView\n      android:id="@+id/imageView1"\n      android:layout_width="wrap_content"\n      android:layout_height="wrap_content"\n      android:layout_alignParentLeft="true"\n      android:layout_marginLeft="10dp"\n      android:layout_marginTop=\xe2\x80\x9d11dp\xe2\x80\x9d\n      android:background=\xe2\x80\x9d@drawable/image\xe2\x80\x9d  />\n\n</RelativeLayout>\n

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然后我需要以编程方式设置边距：

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ImageView imageView = (ImageView) findViewRoot(R.id.imageView1);\nRelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) imageView.getLayoutParams();\nparams.width = 100;\nparams.height = 100;\nparams.setMargins(0,0,0,0); //NOT WORK\nimageView.setLayoutParams(params);\n

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ImageView仍然有marginLeft 10和marginTop 11；

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怎么了？

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Answer 1

尝试使用ViewGroup.MarginLayoutParams为您的ImageView. 这是@Hiren Patel 答案中的一种方法，非常适合我。

private void setMargins (View view, int left, int top, int right, int bottom) {
    if (view.getLayoutParams() instanceof ViewGroup.MarginLayoutParams) {
        ViewGroup.MarginLayoutParams p = (ViewGroup.MarginLayoutParams) view.getLayoutParams();
        p.setMargins(left, top, right, bottom);
        view.requestLayout();
    }
}

如何在代码中使用的示例：

public void testMargin(View view){
    ImageView imageView = (ImageView) findViewById(R.id.imageView1);
    RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)   imageView.getLayoutParams();
    params.width = 100;
    params.height = 100;
    setMargins(imageView , 0, 0, 0, 0);
    imageView.setLayoutParams(params);
}

我的测试布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/holo_blue_light"
    tools:context="com.g2o.test.TestActivity">

    <View
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_alignParentLeft="true"
        android:background="@android:color/holo_red_dark" />

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_marginLeft="100dp"
        android:layout_marginTop="100dp"
        android:adjustViewBounds="true"
        android:background="@drawable/cast_ic_notification_0" />

    <Button
        android:id="@+id/test"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:onClick="testMargin"
        android:text="Test" />" />

</RelativeLayout>

希望这可以帮助！！