而应用程序正在运行

而应用程序正在运行

本文介绍了更改XML形状颜色,而应用程序正在运行的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

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"/>

这篇关于更改XML形状颜色,而应用程序正在运行的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-15 07:26