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在 Activity 中显示对话框或弹出浮层时，尽量使用 DialogFragment，而非Dialog/AlertDialog，这样便于随Activity生命周期管理对话框/弹出浮层的生命周期。

AskDialogFragment.java

public class AskDialogFragment extends DialogFragment {    public Context mContext;    public LayoutInflater mInflater;    private View tipsView;    public TextView tipsTextView;    private TextView textTitle;    private Button buttonYes;    private Button buttonNo;    private AskFragmentInterface askFragmentInterface = null;    public static AskDialogFragment newInstance() {        Bundle args = new Bundle();        AskDialogFragment fragment = new AskDialogFragment();        fragment.setArguments(args);        return fragment;    }    public enum FOCUS_DIR {        FOCUS_YES, FOCUS_NO    }    @Override    public void onCreate(Bundle savedInstanceState) {        setStyle(AskDialogFragment.STYLE_NO_FRAME,R.style.Theme_No_Frame);        super.onCreate(savedInstanceState);    }    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        System.out.println("tag = "+getTag()); // tag which is from acitivity which started this fragment        getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);        this.mContext = getActivity();        this.mInflater = LayoutInflater.from(mContext);        initView();        initPopup();        setFocusDir(FOCUS_DIR.FOCUS_YES);        setButtonNoStatus(View.VISIBLE);        setTitle(R.string.warning);        setMessage(R.string.really_delete_all);        setPositiveButton(getString(R.string.yes), new View.OnClickListener() {            @Override            public void onClick(View view) {                askFragmentInterface.setAskPositiveClick();                dismiss();            }        });        setNegativeButton(getString(R.string.no), new View.OnClickListener() {            @Override            public void onClick(View view) {                dismiss();            }        });        buttonNo.setOnKeyListener(new View.OnKeyListener() {            @Override            public boolean onKey(View v, int keyCode, KeyEvent event) {                // TODO Auto-generated method stub                if (event.getAction() == KeyEvent.ACTION_DOWN) {                    switch (keyCode) {                        case KeyEvent.KEYCODE_DPAD_LEFT:                        case KeyEvent.KEYCODE_DPAD_RIGHT:                            buttonNo.clearFocus();                            buttonYes.requestFocus();                            buttonYes.setFocusable(true);                            return true;                    }                }                return false;            }        });        buttonYes.setOnKeyListener(new View.OnKeyListener() {            @Override            public boolean onKey(View v, int keyCode, KeyEvent event) {                // TODO Auto-generated method stub                if (event.getAction() == KeyEvent.ACTION_DOWN) {                    switch (keyCode) {                        case KeyEvent.KEYCODE_DPAD_LEFT:                        case KeyEvent.KEYCODE_DPAD_RIGHT:                            buttonYes.clearFocus();                            buttonNo.requestFocus();                            buttonNo.setFocusable(true);                            return true;                    }                }                return false;            }        });        return tipsView;    }    @Override    public void onResume() {        super.onResume();    }    public void setAskDialogListener(AskFragmentInterface listener){        askFragmentInterface = listener;    }    public interface AskFragmentInterface {       void setAskPositiveClick();    }    private void initView() {        // requestWindowFeature(Window.FEATURE_NO_TITLE);        tipsView = mInflater.inflate(R.layout.ask_tips_dialog, null);        WindowManager.LayoutParams params = new WindowManager.LayoutParams();        params.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;        getActivity().getWindow().setWindowAnimations(R.style.popwin_anim_bottom_style);        textTitle = (TextView) tipsView.findViewById(R.id.asktipsTitleText);        tipsTextView = (TextView) tipsView.findViewById(R.id.asktips_dialog_tips_text);        buttonNo = (Button) tipsView.findViewById(R.id.asktips_dialog_butNo);        buttonYes = (Button) tipsView.findViewById(R.id.asktips_dialog_butYes);    }    public void setFocusDir(FOCUS_DIR dir) {        if (dir == FOCUS_DIR.FOCUS_NO) {            buttonYes.clearFocus();            buttonNo.requestFocus();            buttonNo.setFocusable(true);        } else {            buttonNo.clearFocus();            buttonYes.requestFocus();            buttonYes.setFocusable(true);        }    }    private void initPopup() {        // TODO Auto-generated method stub        WindowManager.LayoutParams lp =  getActivity().getWindow().getAttributes();        lp.gravity = Gravity.CENTER;        lp.type = WindowManager.LayoutParams.TYPE_PHONE | WindowManager.LayoutParams.TYPE_SYSTEM_ERROR;        lp.width = WindowManager.LayoutParams.MATCH_PARENT;        lp.height = WindowManager.LayoutParams.MATCH_PARENT;        getActivity().getWindow().setAttributes(lp);    }    public void setMessage(CharSequence message) {        tipsTextView.setText(message);    }    public void setMessage(int messageId) {        tipsTextView.setText(messageId);    }    public void setTitle(CharSequence message) {        textTitle.setText(message);    }    public void setTitle(int messageId) {        textTitle.setText(messageId);    }    public void setPositiveButton(CharSequence text, Button.OnClickListener listener) {        buttonYes.setText(text);        buttonYes.setOnClickListener(listener);    }    public void setPositiveButton(int id, Button.OnClickListener listener) {        buttonYes.setText(id);        buttonYes.setOnClickListener(listener);    }    public void setNegativeButton(CharSequence text, Button.OnClickListener listener) {        buttonNo.setText(text);        buttonNo.setOnClickListener(listener);    }    public void setNegativeButton(int id, Button.OnClickListener listener) {        buttonNo.setText(id);        buttonNo.setOnClickListener(listener);    }        public void setButtonNoStatus(int visibility) {        buttonNo.setVisibility(visibility);        buttonYes.setFocusable(true);        buttonYes.requestFocus();    }}

使用方法：

1.实现接口AskFragmentInterface

2.

final AskDialogFragment askTipsDialog = AskDialogFragment.newInstance();        askTipsDialog.setAskDialogListener(this);        askTipsDialog.show(getFragmentManager(), "dialog_fragment");

XML:

1.style

2.layout

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