Binary XML file line 2: Error inflating class_binary xml file line #2: error inflating class-CSDN博客

文章目录

问题
解决方案

在开发中遇到一个神奇的坑，先做记录。

问题

功能很简单，给某个点击区域设置按压态，正常颜色是 @color/colorPrimaryDark，被点击时是 @color/colorPrimary，用 selector 实现，具体代码如下：

MainActivity:

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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="@color/background"
    tools:context=".MainActivity">
</android.support.constraint.ConstraintLayout>

background.xml 放在 res/color 目录下，内容为：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="@color/colorPrimary" android:state_pressed="true" />
    <item android:color="@color/colorPrimaryDark" />
</selector>

在 Android 10 上运行正常，但是在 Android 9 版本上崩溃，堆栈日志如下：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.bgdrawabledemo/com.example.bgdrawabledemo.MainActivity}: android.view.InflateException: Binary XML file line #2: Binary XML file line #2: Error inflating class android.support.constraint.ConstraintLayout
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3430)
        at android.app.Act