java - 如何以编程方式使图像适合 ImageButton

Question

我正在尝试使用此图像设置 ImageButton 的背景:

和代码:

创建时:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    LightImageButton lightImageButton = new LightImageButton(false, getApplicationContext());
    ImageButton imageButton = (ImageButton) findViewById(R.id.imageButton);
    imageButton.setBackground(getResources().getDrawable(lightImageButton.getCurrentImage()));
    imageButton.setOnClickListener(lightImageButton);

}

辅助类:

public class LightImageButton implements View.OnClickListener {
private static final int bulbOnImg = R.drawable.bulb_on;
private static final int bulbOffImg = R.drawable.bulb_off;
private boolean state;
private Context context;
private int currentImage;

public LightImageButton(boolean state, Context context) {
    this.state = state;
    this.context = context;
    currentImage = bulbOffImg;
}

public int getCurrentImage() {
    return currentImage;
}

@Override
public void onClick(View v) {
    ImageButton btn = (ImageButton) v;

    if (state) {
        currentImage = bulbOnImg;
    } else {
        currentImage = bulbOffImg;
    }
    state = !state;
    btn.setBackground(context.getResources().getDrawable(currentImage));
}
}

但收到下一个结果:

我想要正确缩放的图像。我该怎么做？也许有更好的方法使用其他一些可点击的类而不是 ImageButton 来做到这一点？

Answer 1

改变这个:

imageButton.setBackground(getResources().getDrawable(lightImageButton.getCurrentImage()));

与:

imageButton.setImageResource(R.drawable.your_bulb);
imageButton.setScaleType(ImageView.ScaleType.CENTER_CROP);