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public class CustomDialogFragment extends DialogFragment {
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//设置样式
setStyle(DialogFragment.STYLE_NO_TITLE, R.style.CenterDialog);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.view_fragment_dialog, container, false);
}
public static void showDialog(FragmentActivity activity){
CustomDialogFragment customDialogFragment = new CustomDialogFragment();
customDialogFragment.show(activity.getSupportFragmentManager(),"yc");
}
}
//然后一行代码调用
CustomDialogFragment.showDialog(this);STYLE_NORMAL：会显示一个普通的dialog
STYLE_NO_TITLE：不带标题的dialog
STYLE_NO_FRAME：无框的dialog
STYLE_NO_INPUT：无法输入内容的dialog，即不接收输入的焦点，而且触摸无效。1.2.4 如何去掉标题栏，也许你会问，为什么第二种要在super.onActivityCreated(savedInstanceState)之前设置呢。这个是因为，看了源码之后才知道onActivityCreated这个方法中，有mDialog.setContentView(view)这一步，说到setContentView是不是很熟悉。没错，后面再深度解析这块源码思路……
//第一种
//设置样式时，使用STYLE_NO_TITLE
setStyle(DialogFragment.STYLE_NO_TITLE, R.style.CenterDialog);
//第二种
@Override
public void onActivityCreated(Bundle savedInstanceState) {
Window window = getDialog().getWindow();
if(window!=null){
window.requestFeature(Window.FEATURE_NO_TITLE);
}
super.onActivityCreated(savedInstanceState);
}onCreate这个方法主要是保存一些属性状态，比如style样式，theme注意，是否可以取消，后退栈的ID等等。
重点看一下mShowsDialog这个参数，这个参数是Boolean值，mShowsDialog = mContainerId == 0;所以，默认情况下，mContainerId就是0，所以mShowsDialog就是true；而当你在把它当成Fragment使用时，会为其指定xml布局中位置，那么mContainerId也会不为0，所以mShowsDialog就是false。
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mShowsDialog = mContainerId == 0;
if (savedInstanceState != null) {
mStyle = savedInstanceState.getInt(SAVED_STYLE, STYLE_NORMAL);
mTheme = savedInstanceState.getInt(SAVED_THEME, 0);
mCancelable = savedInstanceState.getBoolean(SAVED_CANCELABLE, true);
mShowsDialog = savedInstanceState.getBoolean(SAVED_SHOWS_DIALOG, mShowsDialog);
mBackStackId = savedInstanceState.getInt(SAVED_BACK_STACK_ID, -1);
}
}
public void setStyle(@DialogStyle int style, @StyleRes int theme) {
mStyle = style;
if (mStyle == STYLE_NO_FRAME || mStyle == STYLE_NO_INPUT) {
mTheme = android.R.style.Theme_Panel;
}
if (theme != 0) {
mTheme = theme;
}
}
@NonNull
public Dialog onCreateDialog(Bundle savedInstanceState) {
return new Dialog(getActivity(), getTheme());
}共同点：这两种显示方式都是通过tag的方式将DialogFragment以事务的形式提交,不同的是第二种方式是采用已经创建过的transaction,并且他返回了一个int类型的数值mBackStackId,mBackStackId是干什么用的呢?
public void show(FragmentManager manager, String tag) {
mDismissed = false;
mShownByMe = true;
FragmentTransaction ft = manager.beginTransaction();
ft.add(this, tag);
ft.commit();
}public int show(FragmentTransaction transaction, String tag) {
mDismissed = false;
mShownByMe = true;
transaction.add(this, tag);
mViewDestroyed = false;
mBackStackId = transaction.commit();
return mBackStackId;
}
具体看下面代码
@Override
public void onStart() {
super.onStart();
if (mDialog != null) {
mViewDestroyed = false;
mDialog.show();
}
}@Override
public void onStop() {
super.onStop();
if (mDialog != null) {
mDialog.hide();
}
}
@Override
public void onDestroyView() {
super.onDestroyView();
if (mDialog != null) {
// Set removed here because this dismissal is just to hide
// the dialog -- we don't want this to cause the fragment to
// actually be removed.
mViewDestroyed = true;
mDialog.dismiss();
mDialog = null;
}
}
第一种：链式编程，如下所示
BottomDialogFragment.create(getSupportFragmentManager())
.setViewListener(new BottomDialogFragment.ViewListener() {
@Override
public void bindView(View v) {
}
})
.setLayoutRes(R.layout.dialog_bottom_layout_list)
.setDimAmount(0.5f)
.setTag("BottomDialog")
.setCancelOutside(true)
.setHeight(getScreenHeight() / 2)
.show();第二种：直接继承，可以高度定制自己想要的弹窗
public class ADialog extends BaseDialogFragment {
@Override
protected boolean isCancel() {
return false;
}
@Override
public int getLayoutRes() {
return 0;
}
@Override
public void bindView(View v) {
}
}lang.IllegalStateException: Can not perform this action after onSaveInstanceState at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1493)追踪报错日志的来源
//第一步：
public FragmentManager getSupportFragmentManager() {
return mFragments.getSupportFragmentManager();
}//第二步:
public FragmentManager getSupportFragmentManager() {
return mHost.getFragmentManagerImpl();
}
//第三步：
FragmentManagerImpl getFragmentManagerImpl() {
return mFragmentManager;
}
//第四步：看beginTransaction()方法@Override
br/>@Override
return new BackStackRecord(this);
}
//第五步：看BackStackRecord类中看commit方法@Override
br/>@Override
return commitInternal(false);
}
@Override
public int commitAllowingStateLoss() {
return commitInternal(true);
}
//第六步：可以看到这俩函数的区别就是commitInternal()方法中参数一个为true，一个为false
int commitInternal(boolean allowStateLoss) {
if (mCommitted) throw new IllegalStateException("commit already called");
if (FragmentManagerImpl.DEBUG) {
Log.v(TAG, "Commit: " + this);
LogWriter logw = new LogWriter(TAG);
PrintWriter pw = new PrintWriter(logw);
dump(" ", null, pw, null);
pw.close();
}
mCommitted = true;
if (mAddToBackStack) {
mIndex = mManager.allocBackStackIndex(this);
} else {
mIndex = -1;
}
mManager.enqueueAction(this, allowStateLoss);
return mIndex;
}
//第七步：再追踪到enqueueAction(this,allowStateLoss)
public void enqueueAction(OpGenerator action, boolean allowStateLoss) {
if (!allowStateLoss) {
checkStateLoss();
}
synchronized (this) {
if (mDestroyed || mHost == null) {
throw new IllegalStateException("Activity has been destroyed");
}
if (mPendingActions == null) {
mPendingActions = new ArrayList<>();
}
mPendingActions.add(action);
scheduleCommit();
}
}
//第八步：checkStateLoss()方法，这里可以看到抛出的错误日志呢
private void checkStateLoss() {
if (mStateSaved) {
throw new IllegalStateException(
"Can not perform this action after onSaveInstanceState");
}
if (mNoTransactionsBecause != null) {
throw new IllegalStateException(
"Can not perform this action inside of " + mNoTransactionsBecause);
}
}
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