java如何在处理主活动之前从另一个方法中获取值？
我希望电话号码被加载到字符串xx中“…如何可能？如何在方法之间共享数据？我已经尝试公开该方法，但这没有帮助…我知道该活动从主活动开始…那么如何可能从另一个方法获取数据，然后处理主活动
public class MsgcontactActivity extends Activity {
private static final int CONTACT_PICKER_RESULT = 1001;
public void doLaunchContactPicker(View view)
{
Intent contactPickerIntent = new Intent(Intent.ACTION_PICK,Contacts.CONTENT_URI);
startActivityForResult(contactPickerIntent, CONTACT_PICKER_RESULT);
}
EditText phoneTxt;
TextView tv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv=(TextView) findViewById(R.id.textView1);
String xx=phoneTxt.getText().toString();
Toast.makeText(getApplicationContext(), xx,Toast.LENGTH_LONG ).show();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
{
String phone="";
Cursor contacts=null;
try
{
if (resultCode == RESULT_OK)
{
switch (requestCode)
{
case CONTACT_PICKER_RESULT:
Uri result = data.getData();
String id = result.getLastPathSegment();
contacts=getContentResolver().query(Phone.CONTENT_URI, null, Phone.CONTACT_ID + "=?", new String[] { id }, null);
int phoneIdx = contacts.getColumnIndex(Phone.DATA);
if (contacts.moveToFirst())
{
phone = contacts.getString(phoneIdx);
EditText phoneTxt=(EditText)findViewById(R.id.phoneno);
phoneTxt.setText(phone);
}
else
{
Toast.makeText(this, "error", 100).show();
}
break;
}
}
else
{
Toast.makeText(this, "Warning: activity result not ok",50).show();
}
}
catch (Exception e)
{
Toast.makeText(this, e.getMessage(), 50).show();
}
finally
{
if (contacts != null)
{
contacts.close();
}
}
}
}
}
XML代码：-
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
安卓:id="@+id/relativeLayout3"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content" >
<EditText
安卓:layout_height="wrap_content"
安卓:id="@+id/phoneno"
安卓:inputType="text|phone"
安卓:layout_width="wrap_content"
安卓:layout_toLeftOf="@+id/Contacts"
安卓:layout_alignParentLeft="true"/>
<Button
安卓:layout_width="wrap_content"
安卓:layout_height="wrap_content"
安卓:id="@+id/Contacts"
安卓:text="Contacts"
安卓:layout_alignParentRight="true"
安卓:onClick="doLaunchContactPicker"/>
<TextView
安卓:text="TextView"
安卓:layout_width="wrap_content"
安卓:id="@+id/textView1"
安卓:layout_height="wrap_content"
安卓:layout_below="@+id/phoneno"
安卓:layout_alignParentLeft="true"/>
</RelativeLayout>
下一次尝试
public class MsgcontactActivity extends Activity {
private static final int CONTACT_PICKER_RESULT = 1001;
public void doLaunchContactPicker(View view)
{
Intent contactPickerIntent = new Intent(Intent.ACTION_PICK,Contacts.CONTENT_URI);
startActivityForResult(contactPickerIntent, CONTACT_PICKER_RESULT);
}
EditText phoneTxt;
Button b;
TextView tv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
b=(Button) findViewById(R.id.button1);
tv=(TextView) findViewById(R.id.textView1);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
doLaunchContactPicker(v);
}
});
String xx=phoneTxt.getText().toString();
tv.setText(xx);
}
@Override
public void onActivityResult(int requestCode, int resultCode,
Intent data) {
{
String phone="";
Cursor contacts=null;
try
{
if (resultCode == RESULT_OK)
{
switch (requestCode)
{
case CONTACT_PICKER_RESULT:
Uri result = data.getData();
String id = result.getLastPathSegment();
contacts=getContentResolver().query(Phone.CONTENT_URI, null, Phone.CONTACT_ID + "=?", new String[] { id }, null);
int phoneIdx = contacts.getColumnIndex(Phone.DATA);
if (contacts.moveToFirst())
{
phone = contacts.getString(phoneIdx);
EditText phoneTxt=(EditText)findViewById(R.id.editText1);
phoneTxt.setText(phone);
}
else
{
Toast.makeText(this, "error", 100).show();
}
break;
}
}
else
{
Toast.makeText(this, "Warning: activity result not ok",50).show();
}
}
catch (Exception e)
{
Toast.makeText(this, e.getMessage(), 50).show();
}
finally
{
if (contacts != null)
{
contacts.close();
}
}
}
}
}
HTML代码
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
安卓:id="@+id/relativeLayout3"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content" >
<EditText 安卓:layout_width="wrap_content" 安卓:layout_height="wrap_content" 安卓:id="@+id/editText1" 安卓:layout_alignParentTop="true" 安卓:layout_alignParentLeft="true">
<requestFocus></requestFocus>
</EditText>
<Button 安卓:id="@+id/button1" 安卓:layout_width="wrap_content" 安卓:text="Button" 安卓:layout_height="wrap_content" 安卓:layout_alignParentTop="true" 安卓:layout_toRightOf="@+id/editText1" 安卓:layout_marginLeft="33dp"></Button>
<TextView 安卓:text="TextView" 安卓:layout_width="wrap_content" 安卓:id="@+id/textView1" 安卓:layout_height="wrap_content" 安卓:layout_alignParentBottom="true" 安卓:layout_centerHorizontal="true"></TextView>
</RelativeLayout>
# 1 楼答案
在onCreate（）方法中的
setContentView(R.layout.main);之后调用这个doLaunchContactPicker()方法，如果在doLaunchContactPicker()方法中没有使用视图，那么不要将View作为方法中的参数传递，并在setContentView(R.layout.main);之后添加这一行Button btn=(Button) findViewById(R.id.Contacts);