Question

这是我从Android手机获取联系人列表的JAVA代码。它在Android 2.2.2版本中运行良好，但在android 4.2.2版本上无法运行

public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.phonenumber);
    lv= (ListView) findViewById(R.id.lv);
    getCnumber();
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,aa);
lv.setAdapter(adapter);
}

public void getCnumber()
{
    ContentResolver cr=this.getContentResolver();
    Cursor phones =  cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null, null);
    while (phones.moveToNext()) {
        phoneNumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
    // System.out.println(".................."+phoneNumber); 

        aa.add(phoneNumber);


    }


 }

这是我的xml代码

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:android1="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >

<ListView
    android1:id="@+id/lv"
    android1:layout_width="match_parent"
    android1:layout_height="wrap_content"
    android1:layout_alignParentLeft="true"
    android1:layout_alignParentTop="true" >
</ListView>

</RelativeLayout>

这是我得到的错误在这里输入代码

10-12 09:54:50.788: E/AndroidRuntime(2739): FATAL EXCEPTION: main
10-12 09:54:50.788: E/AndroidRuntime(2739): java.lang.RuntimeException: Unable to start activity     ComponentInfo{com.example.registeration/com.example.registeration.MobileNumber}: java.lang.NullPointerException: storage == null
10-12 09:54:50.788: E/AndroidRuntime(2739):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at android.os.Handler.dispatchMessage(Handler.java:99)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at android.os.Looper.loop(Looper.java:137)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at android.app.ActivityThread.main(ActivityThread.java:5041)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at java.lang.reflect.Method.invokeNative(Native Method)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at java.lang.reflect.Method.invoke(Method.java:511)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at dalvik.system.NativeStart.main(Native Method)
10-12 09:54:50.788: E/AndroidRuntime(2739): Caused by: java.lang.NullPointerException: storage == null
10-12 09:54:50.788: E/AndroidRuntime(2739):     at java.util.Arrays$ArrayList.<init>(Arrays.java:38)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at java.util.Arrays.asList(Arrays.java:154)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at android.widget.ArrayAdapter.<init>(ArrayAdapter.java:128)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at com.example.registeration.MobileNumber.onCreate(MobileNumber.java:66)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at android.app.Activity.performCreate(Activity.java:5104)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
10-12 09:54:50.788: E/AndroidRuntime(2739):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
10-12 09:54:50.788: E/AndroidRuntime(2739):     ... 11 more
10-12 09:54:54.735: I/Process(2739): Sending signal. PID: 2739 SIG: 9

我的Android应用程序在Android 2.2.2上运行良好，但没有在android 4.2.2上运行

0 个答案: