Android Fragment的使用 七 Argument和startActivityForResult传递数据

Activity向Fragment的传递信息，我们都是通过getIntent.getExtra这样获得的，

然而这样有弊端，因为这个需要跳转activity，可以说是很麻烦。

然而Fragment有Argument参数能够设置，使用这个Fragment的activity创建Fragment后能够设置参数，然后Fragment接受传输数据。

使用例子如下：

public class MainActivity extends Activity
{

@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

}

public void showLoginDialog(View view)
{
FragmentManager fragmentManager = getFragmentManager();
EditNameDialogFragment newFragment = EditNameDialogFragment.newInstance("呵呵");
// The device is smaller, so show the fragment fullscreen
FragmentTransaction transaction = fragmentManager
.beginTransaction();
// For a little polish, specify a transition animation
transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
transaction.replace(R.id.id_ly, newFragment).commit();

}

}

public class EditNameDialogFragment extends Fragment
{
private String mArgument;
public static final String ARGUMENT = "argument";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{

View view = inflater.inflate(R.layout.fragment_edit_name, container,
false);
Bundle bundle = getArguments();
if (bundle != null)
{
mArgument = bundle.getString(ARGUMENT);
Log.v("zzw",mArgument);
}
return view;
}

public static EditNameDialogFragment newInstance(String argument)
{
Bundle bundle = new Bundle();
bundle.putString(ARGUMENT, argument);
EditNameDialogFragment contentFragment = new EditNameDialogFragment();
contentFragment.setArguments(bundle);
return contentFragment;
}
}

activity_main

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="showLoginDialog"
android:text="自动适应屏幕" />

<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/id_ly"
></FrameLayout>

</LinearLayout>

fragment_edit_name

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >

<TextView
android:id="@+id/id_label_your_name"
android:layout_width="wrap_content"
android:layout_height="32dp"
android:gravity="center_vertical"
android:text="Your name:" />

<EditText
android:id="@+id/id_txt_your_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/id_label_your_name"
android:imeOptions="actionDone"
android:inputType="text" />

<Button
android:id="@+id/id_sure_edit_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@id/id_txt_your_name"
android:text="ok"/>
<Button
android:id="@+id/id_cancel_edit_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/id_txt_your_name"
android:text="cancel"
android:layout_alignParentLeft="true"/>

</RelativeLayout>

接下来我在给大家讲一下子activity的startActivityForResult

如何在Fragment里使用，虽然Fragment能够直接使用startActivityForResult跳转activity，但是如果需要对方activity的Fragment接受数据，这需要一个中转过程，由宿主activity接受数据，然后通过Argument传送数据给Fragment，然后由Fragment返回数据。

使用例子如下，（MainActivity和EditNameDialogFragment

的布局代码如上一样就不重复贴了）：

public class MainActivity extends Activity
{

@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

public void showLoginDialog(View view)
{
FragmentManager fragmentManager = getFragmentManager();
EditNameDialogFragment newFragment = new EditNameDialogFragment();
// The device is smaller, so show the fragment fullscreen
FragmentTransaction transaction = fragmentManager
.beginTransaction();
// For a little polish, specify a transition animation
transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
transaction.replace(R.id.id_ly, newFragment).commit();

}

}

public class EditNameDialogFragment extends Fragment
{
public static final int REQUEST_DETAIL = 0x110;
public static final String ARGUMENT = "argument";
public static final String RESPONSE = "response";

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{

View view = inflater.inflate(R.layout.fragment_edit_name, container,
false);
view.findViewById(R.id.id_sure_edit_name).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(),ContentActivity.class);
intent.putExtra(ARGUMENT,"来自EditNameDialogFragment的消息");
startActivityForResult(intent, 0);

}
});
return view;
}

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

super.onActivityResult(requestCode, resultCode, data);
if(requestCode==0 && resultCode==REQUEST_DETAIL) {
Log.e("zzw", "receive");
}
}

}

public class ContentFragment extends Fragment
{

public static final int REQUEST_DETAIL = 0x110;
public static final String ARGUMENT = "argument";
public static final String RESPONSE = "response";

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.fragment_login_dialog, container,
false);
Bundle bundle = getArguments();
if (bundle != null) {
String mArgument = bundle.getString(ARGUMENT);
Log.v("zzw", mArgument);
Intent intent = new Intent();
intent.putExtra(RESPONSE, "good");
getActivity().setResult(REQUEST_DETAIL, intent);
Log.v("zzw", "reponse");

}

return view;
}

public static ContentFragment newInstance(String argument)
{
Bundle bundle = new Bundle();
bundle.putString(ARGUMENT, argument);
ContentFragment contentFragment = new ContentFragment();
contentFragment.setArguments(bundle);
return contentFragment;
}

}

public class ContentActivity extends Activity
{

@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.content);

String title = getIntent().getStringExtra(ContentFragment.ARGUMENT);

FragmentManager fragmentManager = getFragmentManager();
ContentFragment newFragment = ContentFragment.newInstance(title);
// The device is smaller, so show the fragment fullscreen
FragmentTransaction transaction = fragmentManager
.beginTransaction();
// For a little polish, specify a transition animation
transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
transaction.replace(R.id.id_lycontent, newFragment).commit();

}

}

content

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/id_lycontent"
></FrameLayout>

</LinearLayout>

fragment_login_dialog

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >

<ImageView
android:layout_width="match_parent"
android:layout_height="64dp"
android:background="#FFFFBB33"
android:contentDescription="@string/app_name"
android:scaleType="center"
android:src="@drawable/title" />

<EditText
android:id="@+id/id_txt_username"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="4dp"
android:layout_marginLeft="4dp"
android:layout_marginRight="4dp"
android:layout_marginTop="16dp"
android:hint="input username"
android:inputType="textEmailAddress" />

<EditText
android:id="@+id/id_txt_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:layout_marginLeft="4dp"
android:layout_marginRight="4dp"
android:layout_marginTop="4dp"
android:fontFamily="sans-serif"
android:hint="input password"
android:inputType="textPassword" />

</LinearLayout>

下次讲一些Fragment的高级应用和一些封装的公共类的使用

再见