是否有可能在Android中创建没有xml的视图？

Question

我想没有XML

public class MyView extends ViewGroup { 

    public MyView (Context context) { 
     super(context); 
     setBackgroundColor(0xffff0000); 

     RelativeLayout base = new RelativeLayout(context); 

     RelativeLayout.LayoutParams rP = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); 
     base.setBackgroundColor(0xff00ff00); 
     base.setLayoutParams(rP); 

     RelativeLayout.LayoutParams iP = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 
     ImageView icon = new ImageView(context); 
     icon.setBackgroundResource(android.R.drawable.ic_menu_add); 
     icon.setLayoutParams(iP); 

     addView(icon); 
     addView(base); 
    } 

    @Override 
    protected void onLayout(boolean changed, int l, int t, int r, int b) { 

    } 
} 

创建自定义视图和actitvy

MyView myview = new MyView(this); 
WindowManager.LayoutParams baseParams = new WindowManager.LayoutParams(
     WindowManager.LayoutParams.MATCH_PARENT, 
     WindowManager.LayoutParams.MATCH_PARENT, 
     WindowManager.LayoutParams.TYPE_PHONE, 
     WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, 
     PixelFormat.TRANSLUCENT); 
addContentView(myview, baseParams); 

使用它，但的LayoutParams不起作用，它什么都不显示

我必须使用此onLayout以使其显示，并且基本布局不是MATCH_PARENT而图标不是WRAP_CONTENT

@Override 
protected void onLayout(boolean changed, int l, int t, int r, int b) { 
    final View child = getChildAt(0); 
    final View child2 = getChildAt(1); 

    child.layout(0, 0, 300, 300); 
    child2.layout(0, 0, 300, 300); 
} 

我也试图图标添加到布局，但应用程序会崩溃

base.addView(icon); 

是否有可能不硬编码来创建此布局的大小和位置？

我检查了RelativeLayout.LayoutParams，但我找不到任何方法将它设置为centerInParent为true。

http://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 
    <ImageView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:src="@android:drawable/ic_menu_add" 
     android:layout_centerInParent="true" 
     /> 
</RelativeLayout> 

Answer 1

请给这个代码一试。

import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.widget.ImageView; 
import android.widget.RelativeLayout; 

public class MainActivity extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     // Create parent RelativeLayout 
     RelativeLayout relParent = new RelativeLayout(this); 
     RelativeLayout.LayoutParams relParentParam = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT); 
     relParent.setLayoutParams(relParentParam); 

     // Create child ImageView 
     ImageView imgView = new ImageView(this); 
     RelativeLayout.LayoutParams imgViewParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); 
     imgView.setLayoutParams(imgViewParams); 
     imgView.setImageResource(android.R.drawable.ic_menu_add); 
     imgViewParams.addRule(RelativeLayout.CENTER_IN_PARENT); 

     // Add child ImageView to parent RelativeLayout 
     relParent.addView(imgView); 

     // Set parent RelativeLayout to your screen 
     setContentView(relParent, relParentParam); 
    } 

}