在较高的水平SDK

Question

推出的Android的minSdkVersion和使用类我测试机器人的minSdkVersion属性，并发现一个奇怪的行为 -

我把的minSdkVersion = 3（1.5）和targetSDKVersion = 4（1.6）在AndroidManifest.xml文件。

为了进行测试，我把下面的行发起活动的onCreate方法 -

android.telephony.SmsManager sm = android.telephony.SmsManager.getDefault(); 
ArrayList<String> stringArray = sm.divideMessage("this is message"); 
Toast.makeText(this, stringArray.get(0), Toast.LENGTH_LONG).show(); 

android.telephony.SmsManager级采用的是Android 1.6引入。

添加这些行后，它在1.6模拟器上显示吐司，但在1.5模拟器上没有显示吐司，也没有崩溃。

我曾期待应用程序会在1.5模拟器上崩溃，但这并未发生。 任何人都可以解释这一点吗？

感谢

Answer 1

试图调用不可用会导致异常类的方法。

我不清楚你为什么没有看到崩溃。也许你有其他的代码可以拯救你。

清单：

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
     package="com.example.versions" 
     android:versionCode="1" 
     android:versionName="1.0"> 
    <application android:icon="@drawable/icon" android:label="@string/app_name"> 
     <activity android:name=".MinSdk" 
        android:label="@string/app_name"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 
       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 

    </application> 
    <uses-sdk android:minSdkVersion="3" /> 

</manifest> 

活动代码：

当在机器人1.5仿真器上运行的logcat的

package com.example.versions; 

import java.util.ArrayList; 

import android.app.Activity; 
import android.os.Bundle; 
import android.telephony.SmsManager; 
import android.widget.Toast; 

public class MinSdk extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     SmsManager sm = SmsManager.getDefault(); 
     ArrayList<String> stringArray = sm.divideMessage("this is message"); 
     Toast.makeText(this, stringArray.get(0), Toast.LENGTH_LONG).show(); 
    } 
} 

转储：

E/dalvikvm( 779): Could not find method android.telephony.SmsManager.getDefault, referenced from method com.example.versions.MinSdk.onCreate 
W/dalvikvm( 779): VFY: unable to resolve static method 3: Landroid/telephony/SmsManager;.getDefault()Landroid/telephony/SmsManager; 
W/dalvikvm( 779): VFY: rejecting opcode 0x71 at 0x0008 
W/dalvikvm( 779): VFY: rejected Lcom/example/versions/MinSdk;.onCreate (Landroid/os/Bundle;)V 
W/dalvikvm( 779): Verifier rejected class Lcom/example/versions/MinSdk; 
W/dalvikvm( 779): Class init failed in newInstance call (Lcom/example/versions/MinSdk;) 
D/AndroidRuntime( 779): Shutting down VM 
W/dalvikvm( 779): threadid=3: thread exiting with uncaught exception (group=0x4000fe70) 
E/AndroidRuntime( 779): Uncaught handler: thread main exiting due to uncaught exception 
E/AndroidRuntime( 779): java.lang.VerifyError: com.example.versions.MinSdk 
E/AndroidRuntime( 779): at java.lang.Class.newInstanceImpl(Native Method) 
E/AndroidRuntime( 779): at java.lang.Class.newInstance(Class.java:1472) 
E/AndroidRuntime( 779): at android.app.Instrumentation.newActivity(Instrumentation.java:1097) 
E/AndroidRuntime( 779): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2186) 
E/AndroidRuntime( 779): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2284) 
E/AndroidRuntime( 779): at android.app.ActivityThread.access$1800(ActivityThread.java:112) 
E/AndroidRuntime( 779): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1692) 
E/AndroidRuntime( 779): at android.os.Handler.dispatchMessage(Handler.java:99) 
E/AndroidRuntime( 779): at android.os.Looper.loop(Looper.java:123) 
E/AndroidRuntime( 779): at android.app.ActivityThread.main(ActivityThread.java:3948) 
E/AndroidRuntime( 779): at java.lang.reflect.Method.invokeNative(Native Method) 
E/AndroidRuntime( 779): at java.lang.reflect.Method.invoke(Method.java:521) 
E/AndroidRuntime( 779): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782) 
E/AndroidRuntime( 779): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540) 
E/AndroidRuntime( 779): at dalvik.system.NativeStart.main(Native Method) 
D/dalvikvm( 541): GC freed 2 objects/48 bytes in 194ms 
I/Process ( 575): Sending signal. PID: 779 SIG: 3 
I/dalvikvm( 779): threadid=7: reacting to signal 3 
I/dalvikvm( 779): Wrote stack trace to '/data/anr/traces.txt'