交换活动时保存和加载联系人 [英] Save and load Contacts when swapping Activities
问题描述
嘿,也许你们中有人可以帮助我:
Hey guys maybe someone of you can help me:
我正在做什么:我的ContactView中有一个按钮,可让我选择一个电话联系人并将姓名和电话号码插入到textviews中.
What im doing: I have a button in my ContactView that lets me select a phonecontact and inserts name and phonenumber into textviews.
我遇到的问题是,当我在MainActivity和ContactActivity之间交换时,联系人被删除了,我需要再次选择一个联系人
The Problem I have is that when i swap between MainActivity and ContactActivity the Contact is deleted and i need to select again a contact
这是我的ContactView代码
Here is my ContactView code
public class ContactView extends AppCompatActivity {
private static final int RESULT_PICK_CONTACT = 85;
private TextView textView1;
private TextView textView2;
private EditText editText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contact_view);
textView1 = (TextView) findViewById(R.id.TxtName);
textView2 = (TextView) findViewById(R.id.TxtNumber);
editText = (EditText) findViewById(R.id.editText);
}
public void onClick(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("ContactView", "Failed to pick contact");
}
}
/**
* Query the Uri and read contact details. Handle the picked contact data.
*
* @param data
*/
private void contactPicked(Intent data) {
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
textView1.setText(name);
textView2.setText(phoneNo);
} catch (Exception e) {
e.printStackTrace();
}
}
这是MainAcitivty中ContactButton的代码,可让我转到ContactView:
This is the code within my MainAcitivty for the ContactButton that lets me go to ContactView:
public boolean onOptionsItemSelected(MenuItem item){
int id = item.getItemId();
if(id == R.id.action_contactView)
{
Intent ContactIntent = new Intent(this, ContactView.class);
startActivity(ContactIntent);
}
return true;
}
是否可以检查我的意图数据是否为空?还是以某种方式保存字符串,只要它们不为空?
is there a way to check if my intent data is empty? or somehow save the strings as long they are not null?
具有共享偏好:
public class ContactView extends AppCompatActivity {
private static final int RESULT_PICK_CONTACT = 85;
private TextView textView1;
private TextView textView2;
private EditText editText;
public SharedPreferences settings = getSharedPreferences("SelectedContact", MODE_PRIVATE);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contact_view);
textView1 = (TextView) findViewById(R.id.TxtName);
textView2 = (TextView) findViewById(R.id.TxtNumber);
editText = (EditText) findViewById(R.id.editText);
SharedPreferences settings = getSharedPreferences("SelectedContact", MODE_PRIVATE);
String name = settings.getString("contactName", "");//the second parameter set a default data if "contactName" is empty
if (!name.isEmpty()){
textView1.setText(name);
}
String phoneNo = settings.getString("contactPhone", "");//the second parameter set a default data if "contactName" is empty
if (!phoneNo.isEmpty()){
textView2.setText(phoneNo);
}
}
public void onClick(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("ContactView", "Failed to pick contact");
}
}
/**
* Query the Uri and read contact details. Handle the picked contact data.
*
* @param data
*/
private void contactPicked(Intent data) {
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
textView1.setText(name);
textView2.setText(phoneNo);
SharedPreferences.Editor editor = settings.edit();
editor.putString("contactName",name );
editor.putString("contactPhone", phoneNo);
editor.commit();
} catch (Exception e) {
e.printStackTrace();
}
}
推荐答案
如果要保存活动状态,请使用SharedPreferences
If you want to save the state of an activity use SharedPreferences
SharedPreferences settings = getSharedPreferences("SelectedContact", MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.putString("contactName",name );
editor.putString("contactPhone",phoneNo);
editor.commit();
现在在您的ContactView的onCreate中检查该变量是否包含数据
now in your onCreate of ContactView check if that variables contains data
SharedPreferences settings = getSharedPreferences("SelectedContact", MODE_PRIVATE);
String name = settings.getString("contactName", "");//the second parameter set a default data if "contactName" is empty
if (!name.isEmpty()){
yourEditText.setText(name);
}
希望这对您有所帮助.告诉我这是否可行!
I hope this helps you. Tell me if this works!
这篇关于交换活动时保存和加载联系人的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!