更改XML形状颜色，而应用程序正在运行 [英] Change XML shape color while app is running

问题描述

是否有可能同时应用程序运行时改变矩形（在XML画）颜色的Java code？

Is it possible to change rectangle (drawn in xml) color in Java code while app is running?

我rectangle.xml：

My rectangle.xml:

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/listview_background_shape">
    <stroke android:width="2dp" android:color="#ffffff" />
    <padding android:left="20dp"
        android:top="20dp"
        android:right="20dp"
        android:bottom="20dp" />

    <solid android:color="#006600" />
</shape>

在main.xml中得出：

Drawn in main.xml by:

<View
    android:id="@+id/myRectangleView"
    android:layout_width="wrap_content"
    android:layout_height="100dp"
    android:background="@drawable/rectangle"/>

我试过这样：

   GradientDrawable sd;
    View viewrectangle;
    viewrectangle = (View) findViewById(R.id.myRectangleView);
    sd = (GradientDrawable) viewrectangle.getBackground();
    sd.setColor(0xffffff00);
    sd.invalidateSelf();

当我把它的OnCreate方法中起作用。

It only works when I put it inside OnCreate method.

我想通过一个按钮来改变矩形的颜色，所以我把这个code按钮的onClick（）方法中。但是，当应用程序同时运行时颜色不会改变我点击按钮。有什么建议？

I want to change rect color by a button, so I put this code inside button's onClick() method. But when I click button while app is running color doesn't change. Any suggestions?

推荐答案

用于此code和它的工作，或者考虑使用viewrectangle.invalidate（）重绘viewrectangle，但它不应该是nescarry：

Used this code and it worked, alternatively consider redrawing the viewrectangle using viewrectangle.invalidate(), but it shouldn't be nescarry:

View viewrectangle;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    viewrectangle = (View) findViewById(R.id.myRectangleView);

}

public void doClick(View v) {
    GradientDrawable sd = (GradientDrawable) viewrectangle.getBackground();
    sd.setColor(0xffffff00);
    sd.invalidateSelf();
}

在这个例子中，doClick（）的方法被设置在main.xml中：

In this example the "doClick()" method is set in the main.xml:

<Button android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:text="Button"
        android:onClick="doClick"/>

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