1. First write a tool class to obtain the ratio
public class AutoUtils {
private Context context;
private static AutoUtils instance;
//标准值
public static final float STANDARD_WIDTH=1080f;
public static final float STANDARD_HEIGHT=1920f;
//实际设备信息
public static float displayMetriceWidth;
public static float displayMetriceHight;
public static AutoUtils getInstance(Context context){
if (instance==null){
instance=new AutoUtils(context);
}
return instance;
}
private AutoUtils(Context context){
this.context=context;
WindowManager windowManager= (WindowManager) context.getSystemService(
Context.WINDOW_SERVICE);
DisplayMetrics displayMetrics=new DisplayMetrics();
if (displayMetriceWidth==0.0f||displayMetriceHight==0.0f){
windowManager.getDefaultDisplay().getMetrics(displayMetrics);
int systemBarHeight = getStatusBarHeight(context);
if(displayMetrics.widthPixels>displayMetrics.heightPixels){
displayMetriceWidth=(float) (displayMetrics.heightPixels);
displayMetriceHight=(float) (displayMetrics.widthPixels-systemBarHeight);
}else {
displayMetriceWidth=(float) (displayMetrics.widthPixels);
displayMetriceHight=(float) (displayMetrics.heightPixels-systemBarHeight);
}
}
}
public float getHorizontalScaleValue(){
return ((float)displayMetriceWidth)/STANDARD_WIDTH;
}
public float getVertivaScaleValue(){
return ((float)(displayMetriceHight)/STANDARD_HEIGHT);
}
/**
* 获取状态栏高度
*
* @param context
* @return
*/
public static int getStatusBarHeight(Context context) {
Resources resources = context.getResources();
int resourceId = resources.getIdentifier("status_bar_height", "dimen", "android");
int statusBarHeight = resources.getDimensionPixelSize(resourceId);
return statusBarHeight;
}
}
2. Customize the layout and calculate the width and height of the component according to the proportion
public class AutoRelativeLayout extends RelativeLayout {
private boolean flag = true;
public AutoRelativeLayout(Context context) {
super(context);
}
public AutoRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public AutoRelativeLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed,l,t,r,b);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//保证值测量一次，查看源码会发现父类也会调用child.onMeasure()方法
if(flag){
float scaleX = AutoUtils.getInstance(getContext()).getHorizontalScaleValue();
float scaleY = AutoUtils.getInstance(getContext()).getVertivaScaleValue();
int childCount = this.getChildCount();
for (int i = 0; i < childCount ; i++) {
View child = getChildAt(i);
LayoutParams layoutParams = (LayoutParams) child.getLayoutParams();
layoutParams.width = (int)(layoutParams.width * scaleX);
layoutParams.height= (int)(layoutParams.height * scaleY);
layoutParams. leftMargin = (int) (layoutParams. leftMargin * scaleX);
layoutParams. rightMargin = (int) (layoutParams. rightMargin * scaleX);
layoutParams. topMargin = (int) (layoutParams. topMargin * scaleY) ;
layoutParams. bottomMargin = (int) (layoutParams. bottomMargin * scaleY);
}
}
flag=false;
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
}
}