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这个问题我研究了很多。我实际上已经完美地工作了，但现在它突然不起作用了。

我正在尝试使用联系人选择器检索联系人的姓名和号码。我想获取名称和号码并在我的应用程序中使用它。

我使用了这个问题的答案中的代码： Selecting a number from user with multiple numbers when using the contact picker

当我尝试打开联系人选择器时，我得到一个 nullPointerException。

这是我的代码：

@Override  
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 

        Uri result = data.getData(); //this is line 71

        // get the phone number id from the Uri
        String id = result.getLastPathSegment();

        // query the phone numbers for the selected phone number id
        Cursor c = getContentResolver().query(Phone.CONTENT_URI, null, Phone._ID + "=?", new String[]{id}, null);

        int phoneIdx = c.getColumnIndex(Phone.NUMBER);
        int nameIdx = c.getColumnIndex(Phone.DISPLAY_NAME);

        if(c.getCount() == 1) { // contact has a single phone number
            // get the only phone number
            if(c.moveToFirst()) {
                phoneNumber = c.getString(phoneIdx);
                contact = c.getString(nameIdx);

                //set text of view to name and number
                contactInfo.setText(contact + ": " + phoneNumber);

            } else {
                Toast.makeText(getApplicationContext(), "There are no contacts to choose from.", Toast.LENGTH_SHORT).show();
            }
        }
    }

日志猫：

01-02 17:42:53.005: E/AndroidRuntime(3509): Uncaught handler: thread main exiting due to uncaught exception

01-02 17:42:53.025: E/AndroidRuntime(3509): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1001, result=0, data=null} to activity {com.MyActivity/com.mystuff.MyActivity}: java.lang.NullPointerException
01-02 17:42:53.025: E/AndroidRuntime(3509):     at android.app.ActivityThread.deliverResults(ActivityThread.java:3329)
01-02 17:42:53.025: E/AndroidRuntime(3509):     at android.app.ActivityThread.handleSendResult(ActivityThread.java:3371)
01-02 17:42:53.025: E/AndroidRuntime(3509):     at android.app.ActivityThread.access$2700(ActivityThread.java:119)
01-02 17:42:53.025: E/AndroidRuntime(3509):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1893)
01-02 17:42:53.025: E/AndroidRuntime(3509):     at android.os.Handler.dispatchMessage(Handler.java:99)
01-02 17:42:53.025: E/AndroidRuntime(3509):     at android.os.Looper.loop(Looper.java:123)
01-02 17:42:53.025: E/AndroidRuntime(3509):     at android.app.ActivityThread.main(ActivityThread.java:4363)
01-02 17:42:53.025: E/AndroidRuntime(3509):     at java.lang.reflect.Method.invokeNative(Native Method)
01-02 17:42:53.025: E/AndroidRuntime(3509):     at java.lang.reflect.Method.invoke(Method.java:521)
01-02 17:42:53.025: E/AndroidRuntime(3509):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
01-02 17:42:53.025: E/AndroidRuntime(3509):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
01-02 17:42:53.025: E/AndroidRuntime(3509):     at dalvik.system.NativeStart.main(Native Method)
01-02 17:42:53.025: E/AndroidRuntime(3509): Caused by: java.lang.NullPointerException
01-02 17:42:53.025: E/AndroidRuntime(3509):     at com.emergencydialer.MainEmergencyDialerActivity.onActivityResult(MyActivity.java:71)
01-02 17:42:53.025: E/AndroidRuntime(3509):     at android.app.Activity.dispatchActivityResult(Activity.java:3828)
01-02 17:42:53.025: E/AndroidRuntime(3509):     at android.app.ActivityThread.deliverResults(ActivityThread.java:3325)

我在代码中用注释标记了第 71 行。这令人沮丧，因为该代码昨天运行良好。不知道我做了什么，也不知道为什么数据返回 null。有任何想法吗？

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1 回答 1

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在处理返回的数据之前，您应该检查您的 resultCode（RESULT_CANCELED 或 RESULT_OK： http: //developer.android.com/reference/android/app/Activity.html#RESULT_CANCELED ）以及数据是否为空。

您还应该检查在哪里抛出 startActivityForResult

于 2013-01-03T01:27:44.793 回答