Helllo Guys。
当我想从ContactView获取字符串到我的MainActivity时,我遇到了问题。
我尝试在ContactView中创建一个Intent,并在MainAcitivty中从此intent中检索数据。
我遇到的问题是,当我在ContactView中执行任何操作时,它会打开MainActivity:
我做的是:
ContactView.java
//this is where the Activity gets opend right?
Intent getContact = new Intent(this, MainActivity.class);
getContact.putExtra("Contact",phoneNo);
startActivity(getContact);
这就是我要检索它的方法:
Bundle extras = getIntent().getExtras();
if (extras != null) {
//this is where i should get the contact?
String readContact= extras.getString("Contact")
}
我的ContactView中有一个contactPicked方法,它为我提供了联系人姓名和电话号码,这就是我想要传递给我的MainActivity的内容,因为我有一个按钮,应该用来自ContactView的文本和联系人发送一个发送消息。
这是我的contactPicked方法:
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();
}
我是否需要将意图放入我的方法中?虽然在我选择了联系人之后它会打开我的活动。
我错过了一些我无法找到的东西吗?
有人可以帮我吗?
###修改
这是我点击按钮来选择联系人:
public void onClick(View v) {
Intent contactPickerIntent = new Intent(Intent.ACTION_PICK,
ContactsContract.CommonDataKinds.Phone.CONTENT_URI);
startActivityForResult(contactPickerIntent, RESULT_PICK_CONTACT);
}
###编辑2
我的Activites的订单是ContactView(我选择联系人并显示它们)的MainActivity(MapView)
我仍然想要选择联系人并在我的ContactView中显示它们但是当我再次进入我的MainActivity时,我有一个按钮,它应该从ContactView获取字符串,并像发送短信一样对它们做些什么。
ContactView.java
public class ContactView extends AppCompatActivity {
private static final int RESULT_PICK_CONTACT = 85;
private TextView textView1;
private TextView textView2;
private TextView message;
@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);
message = (TextView) findViewById(R.id.message);
//speicher den aktuellen status der activity
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;
String msg=message.getText().toString();
//String ResqMessage = 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 settings = getSharedPreferences("SelectedContact", MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.putString("contactName", name);
editor.putString("contactPhone", phoneNo);
editor.commit();
} catch (Exception e) {
e.printStackTrace();
}
}
答案 0 :(得分:2)
其实你收到了错误的方式。查看您的代码,您不会通过MainActivity
传递任何捆绑包,因此在通过联系之前无需致电getExtras()
。您可以从MainActivity
:
//start main
Intent getContact = new Intent(this, MainActivity.class);
getContact.putExtra("Contact",phoneNo);
startActivity(getContact);
// In MainActivity onCreate
String contact = getIntent().getStringExtra("Contact");
答案 1 :(得分:0)
您是否在MainActivity中使用了startActivityForResult?
通常在第一个活动中调用startActivityForResult(..)并稍后在onActivityResult方法(在MainActivity中)处理结果。 为此,您必须通过setResult(intent i)在第二个Activity中设置结果。
你正在这样做吗?如果没有,搜索它或我可以给你一些代码..答案 2 :(得分:0)
您应该使用此代码进行解析
Intent intent = new Intent(this,FirstActivity.class);
Bundle bundle = new Bundle();
bundle.putString("data","value");
intent.putExtras(bundle);
startActivity(intent);
并且对于在SecondActivity中获取数据,请使用以下代码:
Bundle bundle = getIntent().
bundle.getString("data");