膨胀视图的问题答案

【问题标题】：problems inflating a view膨胀视图的问题
【发布时间】：2011-08-12 18:52:15
【问题描述】：

我正在尝试为我的glSurfaceView 填充一个用作加载屏幕的视图，同时它会在运行时交换纹理（我知道如何在我的onCreate 期间执行此操作）。它只是一个RelativeLayout，中间有一个进度条，当它完成交换时它消失了，但它没有正确膨胀。

inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    loading = inflater.inflate(R.layout.loading,null);
RelativeLayout loadingScreen = (RelativeLayout) findViewById(R.id.loadingScreen);

其中 loadingScreen 是相对布局的 id。

xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/loadingScreen"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#FFFFFF"
    android:visibility="visible" >

    <ProgressBar
        android:id="@+id/progressBar1"
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true" >
    </ProgressBar>

    <EditText
        android:id="@+id/editText android:layout_height="
        android:layout_width="wrap_content"
        wrap_content="" >
    </EditText>

</RelativeLayout>

为了测试，我在下面的附加代码上方添加了一个 EditText 来测试它：

EditText tester = (EditText) findViewById(R.id.editText); //Now we have an object
    tester.setText("dfdfds");

和错误日志：

08-12 15:07:35.630: ERROR/ActivityThread(2502): Failed to inflate
08-12 15:07:35.630: ERROR/ActivityThread(2502): android.view.InflateException: Binary XML file line #5: Error inflating class com.huskybus.CampusMapOpenGL
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.view.LayoutInflater.createView(LayoutInflater.java:518)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:570)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:623)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.view.LayoutInflater.inflate(LayoutInflater.java:408)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:212)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.app.Activity.setContentView(Activity.java:1657)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at com.huskybus.Main.onCreate(Main.java:91)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.app.ActivityThread.access$1500(ActivityThread.java:123)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.os.Looper.loop(Looper.java:130)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.app.ActivityThread.main(ActivityThread.java:3835)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at java.lang.reflect.Method.invokeNative(Native Method)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at java.lang.reflect.Method.invoke(Method.java:507)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at dalvik.system.NativeStart.main(Native Method)
08-12 15:07:35.630: ERROR/ActivityThread(2502): Caused by: java.lang.reflect.InvocationTargetException
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at java.lang.reflect.Constructor.constructNative(Native Method)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at java.lang.reflect.Constructor.newInstance(Constructor.java:415)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at android.view.LayoutInflater.createView(LayoutInflater.java:505)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     ... 21 more
08-12 15:07:35.630: ERROR/ActivityThread(2502): Caused by: java.lang.NullPointerException
08-12 15:07:35.630: ERROR/ActivityThread(2502):     at com.huskybus.CampusMapOpenGL.<init>(CampusMapOpenGL.java:101)
08-12 15:07:35.630: ERROR/ActivityThread(2502):     ... 24 more
08-12 15:07:35.637: DEBUG/AndroidRuntime(2502): Shutting down VM
08-12 15:07:35.637: WARN/dalvikvm(2502): threadid=1: thread exiting with uncaught exception (group=0x40015560)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502): FATAL EXCEPTION: main
08-12 15:07:35.653: ERROR/AndroidRuntime(2502): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.huskybus/com.huskybus.Main}: android.view.InflateException: Binary XML file line #5: Error inflating class com.huskybus.CampusMapOpenGL
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1768)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.app.ActivityThread.access$1500(ActivityThread.java:123)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.os.Looper.loop(Looper.java:130)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.app.ActivityThread.main(ActivityThread.java:3835)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at java.lang.reflect.Method.invokeNative(Native Method)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at java.lang.reflect.Method.invoke(Method.java:507)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at dalvik.system.NativeStart.main(Native Method)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502): Caused by: android.view.InflateException: Binary XML file line #5: Error inflating class com.huskybus.CampusMapOpenGL
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.view.LayoutInflater.createView(LayoutInflater.java:518)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:570)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:623)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.view.LayoutInflater.inflate(LayoutInflater.java:408)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:212)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.app.Activity.setContentView(Activity.java:1657)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at com.huskybus.Main.onCreate(Main.java:91)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     ... 11 more
08-12 15:07:35.653: ERROR/AndroidRuntime(2502): Caused by: java.lang.reflect.InvocationTargetException
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at java.lang.reflect.Constructor.constructNative(Native Method)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at java.lang.reflect.Constructor.newInstance(Constructor.java:415)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at android.view.LayoutInflater.createView(LayoutInflater.java:505)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     ... 21 more
08-12 15:07:35.653: ERROR/AndroidRuntime(2502): Caused by: java.lang.NullPointerException
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     at com.huskybus.CampusMapOpenGL.<init>(CampusMapOpenGL.java:101)
08-12 15:07:35.653: ERROR/AndroidRuntime(2502):     ... 24 more

【问题讨论】：

你能提供堆栈跟踪吗？
已添加，并包含我的测试代码。

标签： android view layout-inflater

【解决方案1】：

尝试 loading.findViewById(...) 而不是 findViewById(...)

【讨论】：

这似乎奏效了，它不再崩溃但我看不到它。知道如何让它在当前视图上膨胀吗？
一旦视图被膨胀到“正在加载”的对象中，您可以像对待任何其他布局对象一样对待它，并使用 addView 将其附加到现有布局中。膨胀只是将 xml 中的复杂布局加载到内存中的一种快速简单的方法，而不是在代码中手动构建它。如果您想替换所有已加载的布局对象，我只需获取顶部父布局，删除所有子布局，然后附加“正在加载”
我不需要删除以前的，几乎可以将其视为启动屏幕。我在 main.xml 文件中设置了 glSurfaceView，我将如何在这种组合中使用 addView？

【解决方案2】：

我也有这种错误。我发现错误是因为我的文本编辑器名称与我的文本编辑器ID不匹配。

【讨论】：

【解决方案3】：

当您膨胀视图时，您需要在查找这样的子视图时使用该视图

    inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    loading = inflater.inflate(R.layout.loading,null);
    RelativeLayout loadingScreen = (RelativeLayout) loading.findViewById(R.id.loadingScreen);

【讨论】：