Android DialogFragment 自定义底部d窗实现

此处使用的编辑器为Android studio

1. 新建 自定义d窗类：如 InputDialog

public class InputDialog extends DialogFragment {


    protected FragmentActivity mActivity;

    public void setmActivity(FragmentActivity mActivity) {
        this.mActivity = mActivity;
    }

    //自定义样式，注：此处主要设置d窗的宽高
    @Override
    public int getTheme() {
        return R.style.InputDialogStyle;
    }

    public void show(){
        mActivity.runOnUiThread(() -> {
            if (isActivityAlive()){
                FragmentManager fm = mActivity.getSupportFragmentManager();
                Fragment prev = fm.findFragmentByTag(getClass().getSimpleName());
                if (prev != null) fm.beginTransaction().remove(prev);
                if (!InputDialog.this.isAdded()) {
                    InputDialog.super.show(fm, getClass().getSimpleName());
                }
            }
        });
    }

    @Override
    public void dismiss() {
        mActivity.runOnUiThread(() -> {
            if (isActivityAlive()) {
                InputDialog.super.dismissAllowingStateLoss();
            }
        });
    }

    private boolean isActivityAlive() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            return mActivity != null && !mActivity.isFinishing() && !mActivity.isDestroyed();
        }else {
            return mActivity != null && !mActivity.isFinishing();
        }
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.dialog_input_layout,container,false);
        return view;
    }

    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
        Dialog dialog;
        dialog = super.onCreateDialog(savedInstanceState);
        Window window = dialog.getWindow();
        window.setGravity(Gravity.BOTTOM);
        return dialog;
    }
}

注：此处的R.layout.dialog_input_layout 为自己的d窗布局，

window.setGravity(Gravity.BOTTON); 表示d窗显示在底部。 

2 添加d窗样式R.style.InputDialogStyle;

在res -> values -> themes.xml (有些版本的文件为styles.xml) 

添加 

3.使用方式

d窗的使用方式为以上部分

下面说的是，当d窗没被注销，并再次进行show()时，进行重新设置的初始值不变，为上一次show的值，出现这情况就需要重写DialogFragment的  onViewStateRestored(),在这里面进行设置初始值