[移动开发]Android DialogFragment 自定义底部弹窗实现

此处使用的编辑器为Android studio

1. 新建?自定义弹窗类：如 InputDialog

public class InputDialog extends DialogFragment {


    protected FragmentActivity mActivity;

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

    //自定义样式，注：此处主要设置弹窗的宽高
    @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 为自己的弹窗布局，

window.setGravity(Gravity.BOTTON); 表示弹窗显示在底部。?

2 添加弹窗样式R.style.InputDialogStyle;

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

添加?

<style name="InputDialogStyle" parent="android:Theme.Holo.Light.Dialog">
    <item name="android:windowBackground">@android:color/transparent</item>
    <item name="android:windowFrame">@null</item>
    <item name="android:windowIsTranslucent">true</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowFullscreen">true</item>
    <item name="android:windowContentOverlay">@null</item>
    <item name="android:windowMinWidthMajor">100%</item><!-- 这为最宽100% -->
    <item name="android:windowMinWidthMinor">100%</item><!-- 这为最高100% -->
    <!-- 设置有遮罩层 -->
    <item name="android:backgroundDimEnabled">true</item>
</style>

3.使用方式

弹窗的使用方式为以上部分

下面说的是，当弹窗没被注销，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

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