Using Dialogfragments

阅读（需FQ）：http://android-developers.blogspot.com/2012/05/using-dialogfragments.html

例子使用了V4支持包。

 

fragment_edit_name.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/edit_name"
    android:layout_width="wrap_content" android:layout_height="wrap_content"
    android:layout_gravity="center" android:orientation="vertical"  >

    <TextView
        android:id="@+id/lbl_your_name" android:text="Your name" 
        android:layout_width="wrap_content" android:layout_height="wrap_content" />
      
    <EditText
        android:id="@+id/txt_your_name"
        android:layout_width="match_parent"  android:layout_height="wrap_content" 
        android:inputType=”text”
        android:imeOptions="actionDone" />
</LinearLayout>

 

对话框Fragment代码：

import android.support.v4.app.DialogFragment;
// ...

public class EditNameDialog extends DialogFragment {

    private EditText mEditText;

    public EditNameDialog() {
        // Empty constructor required for DialogFragment
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_edit_name, container);
        mEditText = (EditText) view.findViewById(R.id.txt_your_name);
        getDialog().setTitle("Hello");

        return view;
    }
}

必须重写构造方法；

可用getDialog().setTitle("Hello")设置标题；

其他跟一般的fragment一样，覆盖onCreateView。

 

Activity调用对话框的代码：

import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
// ...

public class FragmentDialogDemo extends FragmentActivity implements EditNameDialogListener {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        showEditDialog();
    }

    private void showEditDialog() {
        FragmentManager fm = getSupportFragmentManager();
        EditNameDialog editNameDialog = new EditNameDialog();
        editNameDialog.show(fm, "fragment_edit_name");
    }

    @Override
    public void onFinishEditDialog(String inputText) {
        Toast.makeText(this, "Hi, " + inputText, Toast.LENGTH_SHORT).show();
    }
}

There are a few things to notice here. First, because we’re using the support library for backward compatibility with the Fragment API, our Activity extends FragmentActivity from the support library. Because we’re using the support library, we call getSupportFragmentManager() instead of getFragmentManager().

 

下面是加强版DialogFragment：

import android.support.v4.app.DialogFragment;
// ...
public class EditNameDialog extends DialogFragment implements OnEditorActionListener {

    public interface EditNameDialogListener {
        void onFinishEditDialog(String inputText);
    }

    private EditText mEditText;

    public EditNameDialog() {
        // Empty constructor required for DialogFragment
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_edit_name, container);
        mEditText = (EditText) view.findViewById(R.id.txt_your_name);
        getDialog().setTitle("Hello");

        // Show soft keyboard automatically
        mEditText.requestFocus();
        getDialog().getWindow().setSoftInputMode(
                LayoutParams.SOFT_INPUT_STATE_VISIBLE);
        mEditText.setOnEditorActionListener(this);

        return view;
    }

    @Override
    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
        if (EditorInfo.IME_ACTION_DONE == actionId) {
            // Return input text to activity
            EditNameDialogListener activity = (EditNameDialogListener) getActivity();
            activity.onFinishEditDialog(mEditText.getText().toString());
            this.dismiss();
            return true;
        }
        return false;
    }
}

使用VIEW的requestFocus()获得了用户焦点；

使用getDialog().getWindow().setSoftInputMode()调出了键盘；

onEditorAction()来自接口OnEditorActionListener，当用户敲击键盘的时候会回调此函数，在本例子中使用EditorInfo.IME_ACTION_DONE == actionId 来实现当用户敲击done时的响应：回调Activity的接口函数onFinishEditDialog（之所以要声明为接口，是为了让此对话框可以让更多的Activity使用），并调用dismiss隐藏自己。