java.lang.UnsupportedOperationException: Can't convert to dimension: type=0x12问题

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完整报错信息如下：

09-12 02:41:27.588: E/AndroidRuntime(445): FATAL EXCEPTION: main
09-12 02:41:27.588: E/AndroidRuntime(445): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.dialogdemo/com.example.tabhost.TabhostActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.dialogdemo/com.example.tabhost.SystemLoginActivity}: java.lang.UnsupportedOperationException: Can't convert to dimension: type=0x12
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.app.ActivityThread.access$1500(ActivityThread.java:117)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.os.Handler.dispatchMessage(Handler.java:99)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.os.Looper.loop(Looper.java:123)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.app.ActivityThread.main(ActivityThread.java:3683)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at java.lang.reflect.Method.invokeNative(Native Method)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at java.lang.reflect.Method.invoke(Method.java:507)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at dalvik.system.NativeStart.main(Native Method)
09-12 02:41:27.588: E/AndroidRuntime(445): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.dialogdemo/com.example.tabhost.SystemLoginActivity}: java.lang.UnsupportedOperationException: Can't convert to dimension: type=0x12
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.app.ActivityThread.startActivityNow(ActivityThread.java:1487)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:654)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.widget.TabHost.setCurrentTab(TabHost.java:326)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.widget.TabHost.addTab(TabHost.java:216)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at com.example.tabhost.TabhostActivity.onCreate(TabhostActivity.java:29)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
09-12 02:41:27.588: E/AndroidRuntime(445): 	... 11 more
09-12 02:41:27.588: E/AndroidRuntime(445): Caused by: java.lang.UnsupportedOperationException: Can't convert to dimension: type=0x12
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.content.res.TypedArray.getDimensionPixelSize(TypedArray.java:463)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.view.ViewGroup$MarginLayoutParams.<init>(ViewGroup.java:3690)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.widget.LinearLayout$LayoutParams.<init>(LinearLayout.java:1400)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.widget.LinearLayout.generateLayoutParams(LinearLayout.java:1326)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.widget.LinearLayout.generateLayoutParams(LinearLayout.java:47)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.view.LayoutInflater.rInflate(LayoutInflater.java:625)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.view.LayoutInflater.rInflate(LayoutInflater.java:626)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.view.LayoutInflater.inflate(LayoutInflater.java:408)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:207)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.app.Activity.setContentView(Activity.java:1657)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at com.example.tabhost.SystemLoginActivity.onCreate(SystemLoginActivity.java:21)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
09-12 02:41:27.588: E/AndroidRuntime(445): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
09-12 02:41:27.588: E/AndroidRuntime(445): 	... 20 more

注意倒数第四行： at com.example.tabhost.SystemLoginActivity.onCreate(SystemLoginActivity.java:21)

查找到类中第21行是：setContentView(R.layout.activity_login_system);

很明显，说明是布局有问题。

网上找了一大堆，最后发现是这个属性的问题：android:layout_marginLeft="@id/et_password"

2.3不支持，去掉就OK了。这个问题是不是很让人吐血。。。

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