java - 如何从 setImageResource() 调整第二个图像的大小

Question

我是 java/android 新手，正在制作一个测试应用程序。它有图像按钮，单击时会暂时切换到不同的图像。使用

裁剪原件

android:adjustViewBounds="true"
android:scaleType="centerCrop"

在activity_main.xml中问题是第二张图像没有被裁剪，因此对于按钮来说太大了。有谁知道我该如何解决这个问题？这是其中一个按钮的示例:

public void onClick(View v) {

        //switch to second img   
butt2.setImageResource(R.drawable.newimg);

//switch back to first after pause

new Handler().postDelayed(new Runnable() {

   public void run() {

       butt2.setImageResource(R.drawable.orig);


   }

}, 500L);  

            }     
    });

Answer 1

我使用过以下内容

int normal[] = { R.drawable.num0, R.drawable.num1, R.drawable.num2,
            R.drawable.num3, R.drawable.num4, R.drawable.num5,
            R.drawable.num6, R.drawable.num7, R.drawable.num8,
            R.drawable.num9, R.drawable.del, R.drawable.go };
    int pressed[] = { R.drawable.num0_clicked, R.drawable.num1_clicked,
            R.drawable.num2_clicked, R.drawable.num3_clicked,
            R.drawable.num4_clicked, R.drawable.num5_clicked,
            R.drawable.num6_clicked, R.drawable.num7_clicked,
            R.drawable.num8_clicked, R.drawable.num9_clicked,
            R.drawable.del_clicked, R.drawable.go_clicked };
                  StateListDrawable sld;
                  for (int i = 0; i < 12; i++) {
            sld = new StateListDrawable();
            sld.addState(new int[] { android.R.attr.state_pressed },
                    getResources().getDrawable(pressed[i]));
            sld.addState(new int[] {}, getResources().getDrawable(normal[i]));
            btns[i].setImageDrawable(sld);
        }