在 android 中以编程方式创建布局 - 问题 [英] Create Layout Programmatically in android - issue

问题描述

我正在使用以下代码动态创建 FrameLayout

I am creating FrameLayout dynamically using the following code

mylayout.java

mylayout.java

FrameLayout layout = new FrameLayout(this);
FrameLayout.LayoutParams layoutparams=new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.FILL_PARENT,Gravity.CENTER_HORIZONTAL|Gravity.CENTER_VERTICAL);            
layout.setLayoutParams(layoutparams);

webview=new WebView(this);
webview.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT));

splashview=new ImageView(this);
splashview.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT));
splashview.setScaleType(ScaleType.FIT_XY);
splashview.setImageResource(R.drawable.splash);
splashview.setVisibility(View.INVISIBLE);

progressbar=new ProgressBar(this);
FrameLayout.LayoutParams params=new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.MATCH_PARENT,Gravity.CENTER_HORIZONTAL|Gravity.CENTER_VERTICAL);
progressbar.setLayoutParams(params);
progressbar.setVisibility(View.INVISIBLE);          


layout.addView(webview);
layout.addView(progressbar);
layout.addView(splashview);

setContentView(layout);

mylayout.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_gravity="center_vertical|center_horizontal"
    android:gravity="center_vertical|center_horizontal" >

    <WebView
        android:id="@+id/webview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
    </WebView>

<ProgressBar
    android:id="@+id/progressBar"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical|center_horizontal"
    android:visibility="invisible" />




    <ImageView
        android:id="@+id/splashscreen"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:contentDescription="@string/myimg"
        android:scaleType="fitXY"
        android:src="@drawable/splash"
        android:visibility="invisible" />

</FrameLayout>

我需要 java 中上述 xml 文件的等价代码.我犯了什么错误?

I need the equalent code for the above xml file in java. what mistake i did?

注意:使用上面的java代码，每一个都是重叠的.

Note: Using the above java code, each one is overlapping.

推荐答案

Android 开发者- 框架布局文档 内容:

通常，FrameLayout 应该用于保存单个子视图，因为很难以可缩放到不同屏幕尺寸的方式组织子视图，而子视图又不会相互重叠.但是，您可以将多个子项添加到 FrameLayout 并通过使用 android:layout_gravity 属性为每个子项分配重力来控制它们在 FrameLayout 中的位置.

Generally, FrameLayout should be used to hold a single child view, because it can be difficult to organize child views in a way that's scalable to different screen sizes without the children overlapping each other. You can, however, add multiple children to a FrameLayout and control their position within the FrameLayout by assigning gravity to each child, using the android:layout_gravity attribute.

在您的情况下，您可以使用 layout.setForegroundGravity(int) 相同.

In your case, you may use layout.setForegroundGravity(int) for the same.

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