我看到两个解决方案:
最简单的方式:将区域选择和街道选择列表分别作为独立的常规片段,并将它们都放在一个单独的活动中,将此活动作为对话框通过简单主题展示:
<activity android:theme="@android:style/Theme.Dialog" />
然后使用
excludeFromRecents="true"
以使其不会出现在最近使用的应用程序中。首先加载区域选择,然后通过
addToBackStack(null)
添加街道选择,这样你就可以在下面拥有
AreaSelection
片段。
如果由于任何原因您不想为此创建单独的活动,则可以从对话框片段中添加对话框侦听器,而它的实现者(即活动)将打开
AreaFragment
。基于对你的代码的基本理解,这个简单的项目应该做到这一点:
所有者活动:
import com.example.adip.fragments.AreaSelectionFragment;
import com.example.adip.fragments.StreetSelectionFragment;
import com.example.adip.fragments.AreaSelectionFragment.AreaSelectionListener;
import com.example.adip.fragments.StreetSelectionFragment.StreetSelectionListener;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.FragmentActivity;
import android.view.View;
import android.view.View.OnClickListener;
public class DialogsActivity extends FragmentActivity implements OnClickListener,
AreaSelectionListener, StreetSelectionListener {
private static final String AREA_TAG = "AREA_TAG";
private static final String STREETS_TAG = "STREETS_TAG";
@Override
protected void onCreate(Bundle savedInstance) {
super.onCreate(savedInstance);
setContentView(R.layout.area_selections);
findViewById(R.id.btnStuff).setOnClickListener(this);
}
@Override
public void onClick(View v) {
showArea();
}
private void showArea() {
DialogFragment df = new AreaSelectionFragment();
df.show(getSupportFragmentManager(), AREA_TAG);
}
@Override
public void onStreetsUserCanceled() {
showArea();
}
@Override
public void showStreets() {
DialogFragment df = new StreetSelectionFragment();
df.show(getSupportFragmentManager(), STREETS_TAG);
}
}
AreaSelectionFragment(根据您的需求进行扩展):
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
public class AreaSelectionFragment extends DialogFragment {
public static interface AreaSelectionListener {
void showStreets();
}
private AreaSelectionListener areaSelectionListener;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if (activity instanceof AreaSelectionListener) {
areaSelectionListener = (AreaSelectionListener) activity;
} else {
throw new ClassCastException("Parent Activity must implement AreaSelectionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
areaSelectionListener = null;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
return new AlertDialog.Builder(getActivity()).setTitle("Area Selection")
.setPositiveButton("OK", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
areaSelectionListener.showStreets();
}
}).setNegativeButton("Cancel", null).create();
}
}
还有,StreetSelectionFragment
(再次强调:根据您的需求进行扩展):
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
public class StreetSelectionFragment extends DialogFragment {
public static interface StreetSelectionListener {
void onStreetsUserCanceled();
}
private StreetSelectionListener selectionListener;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if (activity instanceof StreetSelectionListener) {
selectionListener = (StreetSelectionListener) activity;
} else {
throw new ClassCastException("Parent activity must implement StreetSelectionListener");
}
}
@Override
public void onDetach() {
selectionListener = null;
super.onDetach();
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
Dialog dialog = new AlertDialog.Builder(getActivity()).setTitle("Street Selection")
.setPositiveButton("OK", null).setNegativeButton("Cancel", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
selectionListener.onStreetsUserCanceled();
}
}).create();
return dialog;
}
@Override
public void onCancel(DialogInterface dialog) {
super.onCancel(dialog);
selectionListener.onStreetsUserCanceled();
}
}