调整图像大小以适应多种屏幕尺寸

问题描述：

我有一款应用程序，可以缩放Android手机上多种屏幕尺寸的图像。调整图像大小以适应多种屏幕尺寸

布局以编程方式创建（无xml），我只是在将图片保存在我的照片编辑器中时定义图片的大小，例如60x60。

它似乎尽可能在平板电脑上扩大规模，但可能会更大。我尝试将图像大小更改为100x100，这会使平板电脑屏幕更加平滑，但现在它不会在较小的设备上缩小该图像......非常令人沮丧。

这里是我的代码：

Android Manifest: enabling resizable attribute and supported screens 

     <manifest xmlns:android="http://schemas.android.com/apk/res/android" 
     package="com.anndconsulting.numbertouch" 
     android:versionCode="1" 
     android:versionName="1.0" 
     android:installLocation="auto" 
     android:resizeable="true" 
     > 
    <supports-screens 
     android:smallScreens="true" 
     android:normalScreens="true" 
     android:largeScreens="true" 
     android:anyDensity="true" 
     />

Game.Java代码：

//create a layout 
    ll = new LinearLayout(this); 
    ll.setOrientation(LinearLayout.VERTICAL); 
    ll.setBackgroundResource(R.drawable.background); 
    ll.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, 
       LayoutParams.FILL_PARENT)); 

    //create another 5 linear layouts which will host 5 buttons horizontally 
    linearLayout1 = new LinearLayout(this); 
    linearLayout1.setOrientation(LinearLayout.HORIZONTAL); 
    linearLayout1.setGravity(Gravity.CENTER); 

    linearLayout2 = new LinearLayout(this); 
    linearLayout2.setOrientation(LinearLayout.HORIZONTAL); 
    linearLayout2.setGravity(Gravity.CENTER); 

    linearLayout3 = new LinearLayout(this); 
    linearLayout3.setOrientation(LinearLayout.HORIZONTAL); 
    linearLayout3.setGravity(Gravity.CENTER); 

    linearLayout4 = new LinearLayout(this); 
    linearLayout4.setOrientation(LinearLayout.HORIZONTAL); 
    linearLayout4.setGravity(Gravity.CENTER); 

    linearLayout5 = new LinearLayout(this); 
    linearLayout5.setOrientation(LinearLayout.HORIZONTAL); 
    linearLayout5.setGravity(Gravity.CENTER); 

    Then i create a 5x5 array of buttons (which I saved as 100x100) in the drawable  folder 

    for (int i = 0; i < 25; i++) { 
      buttonsa.add(createButton(i)); 
     } 
     Collections.shuffle(buttonsa); 

     //add first 5 buttons to first layout 
      for (int i=0;i<5;i++) { 
      linearLayout1.addView(buttonsa.get(i)); 


     } 
     //add remaining 5 to second layout 
     for (int i=5;i<10;i++){ 
      linearLayout2.addView(buttonsa.get(i)); 

     } 
     for (int i=10;i<15;i++){ 
      linearLayout3.addView(buttonsa.get(i)); 

     } 
     for (int i=15;i<20;i++){ 
      linearLayout4.addView(buttonsa.get(i)); 

     } 
     for (int i=20;i<25;i++){ 
      linearLayout5.addView(buttonsa.get(i)); 

     } 
    ll.addView(linearLayout1); 
     ll.addView(linearLayout2); 
     ll.addView(linearLayout3); 
     ll.addView(linearLayout4); 
     ll.addView(linearLayout5); 

my create button function below: 

private Button createButton(final int i) { 
final Button b = new Button(this); 
int mode = mGameSettings.getInt(GAME_PREFERENCES_GAME_MODE, 0); 
if (mode == 1) { 

    b.setText(" "+letter[i]); 
    b.setWidth(20); <-- this is where I thought I could change but does not 
    b.setHeight(20); <-- same here, just fills the small screen with big image 
          and cuts of the rest. 
    } 
    else { 
    b.setText((i+1) +" "); }

答

有与多个屏幕大小和密度的多个设备支持的图像最好的办法是把你的可绘制文件夹中的60 * 60图像和drawable-large-hdpi或drawable-large-mdpi文件夹中的100 * 100图像，或者设备将从中提取可绘制文件的文件夹。这种方式在普通尺寸的手机或任何大屏幕设备上运行应用程序。图像将从相应的可绘制文件夹中拾取并根据设备密度进行缩放。

调整图像大小以适应多种屏幕尺寸

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