DialogFragment監聽back鍵和設置寬高

DialogFragment是系統推薦的dialog，至於它的好處有很多，最重要的是通過Fragment可以把dialog納入到Fragment的生命週期中，這樣就不會出現dialog顯示在activity中旋轉屏幕後dialog發生錯誤。

1 自定義dialogFragment

public class MyDialogFragment extends DialogFragment {
private Context mContext；
private View baseView;
    public static MyDialogFragment newInstance(int type) {
        Bundle args = new Bundle();
        args.putInt("type", type);
        MyDialogFragment fragment = new MyDialogFragment();
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        this.mContext = context;
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        final Dialog dialog = getDialog();
        if (dialog != null) {
            dialog.setCanceledOnTouchOutside(false);
            dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
            if (dialog.getWindow() != null) {
                dialog.getWindow().setBackgroundDrawable(new ColorDrawable(0));
            }
        }
       baseView = inflater.inflate(R.layout.xxxx, null);
        return baseView;
    }

    @Override
    public void onStart() {
        super.onStart();
        final Dialog dialog = getDialog();
        if (dialog != null) {
            if (dialog.getWindow() != null) {
            	//設置寬高
                dialog.getWindow().setLayout(WindowUtils.getScreenWidth(context) * 90 / 192, WindowManager.LayoutParams.WRAP_CONTENT);
            }
        }
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        EventBus.getDefault().register(this);
        if (getArguments() != null) {
            mOpenType = getArguments().getInt("type", 1);
        }
        initViews(baseView );
        initData();
    }

    private void initData() {
		//加載數據
    }

    private void initViews(View view) {
    	//設置dialog的高
        mRootView = view.findViewById(R.id.xxxxxxx)；
        ViewGroup.LayoutParams params = mRootView.getLayoutParams();
        params.height = WindowUtils.getScreenHeight(context) * 5 / 7;
        mRootView.setLayoutParams(params);
        //獲取view ，設置event
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
    }
    }

}

2 DialogFragment監聽返回鍵

實現DialogInterface.OnKeyListener 接口，監聽返回鍵。

implements DialogInterface.OnKeyListener {
 @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        final Dialog dialog = getDialog();
        if (dialog != null) {
            dialog.setCanceledOnTouchOutside(false);
            dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
            if (dialog.getWindow() != null) {
                dialog.getWindow().setBackgroundDrawable(new ColorDrawable(0));
            }
				//添加監聽
            dialog.setOnKeyListener(this);
        }

        return inflater.inflate(R.layout.xxx, null);
    }


 @Override
    public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
        if(keyCode == KeyEvent.KEYCODE_BACK){
        	//此處捕獲back操作，如果不希望所在的Activity監聽到back鍵，需要返回true，消費掉。
            backLogical();
            dismissAllowingStateLoss();
            return true;
        }else {
            //這裏注意當不是返回鍵時需將事件擴散，否則無法處理其他點擊事件
            return false;
        }
    }

3 設置dialogFragment的寬高

 @Override
    public void onStart() {
        super.onStart();
        final Dialog dialog = getDialog();
        if (dialog != null) {
            if (dialog.getWindow() != null) {
               	//設置dailog的寬和高度模式
                dialog.getWindow().setLayout(WindowUtils.getScreenWidth(context) * 90 / 192, WindowManager.LayoutParams.WRAP_CONTENT);
            }
        }
    }

//然後initview時，獲取佈局文件根佈局，設置高度
 ViewGroup.LayoutParams params = mRootView.getLayoutParams();
        params.height = WindowUtils.getScreenHeight(context) * 5 / 7;
        mRootView.setLayoutParams(params);