如何绘制在屏幕的中间的ImageView？ （编程） [英] how to draw a ImageView in the middle of the screen? (programatically)

问题描述

我要画一个简单的ImageView在屏幕的中部，水平和垂直方向。但我想这样做，而不使用XML文件，我需要以编程方式做到这一点。

我trye​​d下一个code，但它不工作正常，它绘制图像一点点的权利和一点点的底部。如何解决呢？

  ARImage =新ImageView的（getApplicationContext（））;
    ARImage.setImageResource（R.drawable.x）;
    rl.addView（ARImage）; // RL是，它插入到一个帧布局相对布局    显示显示=（（窗口管理器）getSystemService（Context.WINDOW_SERVICE））getDefaultDisplay（）。
    INT W = display.getWidth（）;
    INT H = display.getHeight（）;
    RelativeLayout.LayoutParams位置=新RelativeLayout.LayoutParams（LayoutParams.WRAP_CONTENT，LayoutParams.WRAP_CONTENT）;
    position.leftMargin =（int）的（W / 2）;
    position.topMargin =（int）的（H / 2）;
    ARImage.setLayoutParams（位置）;
 

解决方案

这为我的作品是这样的：

 包pete.android.study;进口android.app.Activity;
进口android.content.Context;
进口android.os.Bundle;
进口android.view.Display;
进口android.view.WindowManager;
进口android.widget.ImageView;
进口android.widget.RelativeLayout;
进口android.widget.RelativeLayout.LayoutParams;
公共类主要活动扩展{    / *
     *（非Javadoc中）
     * @see android.app.Activity＃的onCreate（android.os.Bundle）
     * /
    @覆盖
    公共无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        ImageView的ARImage =新ImageView的（getApplicationContext（））;
        ARImage.setImageResource（R.drawable.icon）;
        RelativeLayout的RL =新的RelativeLayout（本）;
        显示显示=（（窗口管理器）getSystemService（Context.WINDOW_SERVICE））getDefaultDisplay（）。
        INT W = display.getWidth（）;
        INT H = display.getHeight（）;
        RelativeLayout.LayoutParams位置=新RelativeLayout.LayoutParams（LayoutParams.WRAP_CONTENT，LayoutParams.WRAP_CONTENT）;
        ARImage.setLayoutParams（位置）;        position.addRule（RelativeLayout.CENTER_IN_PARENT）;
        rl.addView（ARImage，位置）;
        的setContentView（RL）;
    }}
 

I want to draw a simple ImageView in the middle of the screen, horizontally and vertically. But i want to do it without using XML files, i need to do it programatically.

I tryed with the next code, but it doesn't works fine, it draws the image a little to the right and a little to the bottom. How to solve it?

    ARImage = new ImageView(getApplicationContext());
    ARImage.setImageResource(R.drawable.x);
    rl.addView(ARImage); //rl is the relative layout that it's inserted into a frame layout

    Display display = ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
    int w = display.getWidth();
    int h = display.getHeight();
    RelativeLayout.LayoutParams position = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    position.leftMargin = (int)(w/2);
    position.topMargin  = (int)(h/2);
    ARImage.setLayoutParams(position);

解决方案

It works for me like this:

package pete.android.study;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.Display;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.RelativeLayout.LayoutParams;


public class Main extends Activity {

    /*
     * (non-Javadoc)
     * @see android.app.Activity#onCreate(android.os.Bundle)
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ImageView ARImage = new ImageView(getApplicationContext());
        ARImage.setImageResource(R.drawable.icon);
        RelativeLayout rl = new RelativeLayout(this);
        Display display = ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
        int w = display.getWidth();
        int h = display.getHeight();
        RelativeLayout.LayoutParams position = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        ARImage.setLayoutParams(position);  

        position.addRule(RelativeLayout.CENTER_IN_PARENT);
        rl.addView(ARImage, position);  
        setContentView(rl); 
    }

}

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