如何创建联系人选取器活动?

Question

我是一个新手程序员，我一直在尝试在几天内学习如何为学校编码，我喜欢做的一件事就是尝试解构其他代码以更好地学习它。所以我正在考虑尝试制作联系人选择器，我在网上找到了一个教程，但是，代码不起作用，而且我真的不明白错误消息的含义。

我的代码：

public class ContactActivity extends AppCompatActivity {

private static final int RESULT_PICK_CONTACT = 85500;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contact);
}
public void pickContact(View v)
{
Intent contactPickerIntent = new Intent(Intent.ACTION_PICK,
ContactsContract.CommonDataKinds.Phone.CONTENT_URI);
startActivityForResult(contactPickerIntent, RESULT_PICK_CONTACT);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// check whether the result is ok
if (resultCode == RESULT_OK) {
// Check for the request code, we might be usign multiple startActivityForReslut
switch (requestCode) {
case RESULT_PICK_CONTACT:
contactPicked(data);
break;
}
} else {
Log.e("MainActivity", "Failed to pick contact");
}
}
/**
* Query the Uri and read contact details. Handle the picked contact data.
* @param data
*/
private void contactPicked(Intent data) {
Button b1 = findViewById(R.id.button);
Button b2 = findViewById(R.id.button2);
Cursor cursor = null;
try {
String phoneNo = null ;
String name = null;
// getData() method will have the Content Uri of the selected contact
Uri uri = data.getData();
//Query the content uri
cursor = getContentResolver().query(uri, null, null, null, null);
cursor.moveToFirst();
// column index of the phone number
int  phoneIndex =cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
// column index of the contact name
int  nameIndex =cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME);
phoneNo = cursor.getString(phoneIndex);
name = cursor.getString(nameIndex);
// Set the value to the textviews
b1.setText(name);
b2.setText(phoneNo);
} catch (Exception e) {
e.printStackTrace();
}
}

}

错误信息：

08-14 16:25:16.437 3923-3923/com.example.jackson.safetynet E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.jackson.safetynet, PID: 3923
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:389)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:384)
at android.view.View.performClick(View.java:4780) 
at android.view.View$PerformClick.run(View.java:19866) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5254) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
Caused by: java.lang.IllegalArgumentException: Can only use lower 16 bits for requestCode
at android.support.v4.app.BaseFragmentActivityApi14.checkForValidRequestCode(BaseFragmentActivityApi14.java:79)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:748)
at com.example.jackson.safetynet.ContactActivity.pickContact(ContactActivity.java:29)
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:384) 
at android.view.View.performClick(View.java:4780) 
at android.view.View$PerformClick.run(View.java:19866) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5254) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 

所以我看到"由：java.lang.IllegalArgumentException：只能使用较低的 16 位进行请求代码"这一行，我认为这就是问题所在。Result_Pick_Contact有什么东西还是什么？

布局视觉对象

Answer 1

尝试使用较小的正RESULT_PICK_CONTACT值

private static final int RESULT_PICK_CONTACT = 24; 

如本答案所述

您需要传递一个正数来启动活动结果。