android 开发 ——屏幕相关工具类 获取控件宽高，屏幕宽高，状态栏高度等

在开发中， 获取屏幕宽高，控件宽高，动态设置控件宽高等经常用到，写此博客以便记录，下次方便使用；

此工具类包含

控件相关:

通过OnGlobalLayoutListener()直接获取宽高；
通过measure()获取 控件宽高；
动态设置控件宽高；

屏幕相关:

获取屏幕宽高；
获取状态栏高度；
获取当前屏幕截图，包含状态栏
获取当前屏幕截图，不包含状态栏

下面附上代码：

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.WindowManager;
import android.widget.LinearLayout;

/**
 * 屏幕相关的辅助类
 */
public class ScreenUtil {
    private ScreenUtil() {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    //----------------------------------------------控件相关的 ----------------------------------------------

    /**
     * 直接获取控件的宽、高
     */
    public static int[] getWidgetWH(final View view) {
        ViewTreeObserver vto2 = view.getViewTreeObserver();
        vto2.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                view.getViewTreeObserver().removeGlobalOnLayoutListener(this);
            }
        });
        return new int[]{view.getWidth(), view.getHeight()};
    }

    /**
     * 直接获取控件的高
     */
    public static int getViewHeight(final View view) {
        ViewTreeObserver vto2 = view.getViewTreeObserver();
        vto2.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                view.getViewTreeObserver().removeGlobalOnLayoutListener(this);
            }
        });
        return view.getHeight();
    }

    /**
     * 直接获取控件的宽
     */
    public static int getViewWidth(final View view) {
        ViewTreeObserver vto2 = view.getViewTreeObserver();
        vto2.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                view.getViewTreeObserver().removeGlobalOnLayoutListener(this);
            }
        });
        return view.getWidth();
    }

    /**
     * 获取控件的宽
     */
    public static int getWidgetWidth(View view) {
        int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
        int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
        view.measure(w, h);//先度量
        int width = view.getMeasuredWidth();
        return width;
    }

    /**
     * 获取控件的高
     */
    public static int getWidgetHeight(View view) {
        int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
        int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
        view.measure(w, h);//先度量
        int height = view.getMeasuredHeight();
        return height;
    }

    /**
     * 设置控件宽
     * 注意  这儿是 LinearLayout 根据自己需求修改
     */
    public static void setWidgetWidth(View view, int width) {
        LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) view.getLayoutParams();
        params.width = width;
        view.setLayoutParams(params);
    }

    /**
     * 设置控件高
     * 注意  这儿是 LinearLayout 根据自己需求修改
     */
    public static void setWidgetHeight(View view, int height) {
        LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) view.getLayoutParams();
        params.height = height;
        view.setLayoutParams(params);
    }


    //----------------------------------------------屏幕相关的 ----------------------------------------------


    /**
     * 获得屏幕宽度
     */
    public static int getScreenWidth(Context context) {
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.widthPixels;
    }

    /**
     * 获得屏幕高度
     */
    public static int getScreenHeight(Context context) {
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.heightPixels;
    }

    /**
     * 获得状态栏的高度
     */
    public static int getStatusBarHeight(Context context) {
        int statusBarHeight = -1;
        try {
            Class<?> clazz = Class.forName("com.android.internal.R$dimen");
            Object object = clazz.newInstance();
            int height = Integer.parseInt(clazz.getField("status_bar_height")
                    .get(object).toString());
            statusBarHeight = context.getResources().getDimensionPixelSize(height);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return statusBarHeight;
    }

    /**
     * 获取当前屏幕截图，包含状态栏
     */
    public static Bitmap snapShotWithStatusBar(Activity activity) {
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bmp = view.getDrawingCache();
        int width = getScreenWidth(activity);
        int height = getScreenHeight(activity);
        Bitmap bp = null;
        bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
        view.destroyDrawingCache();
        return bp;
    }

    /**
     * 获取当前屏幕截图，不包含状态栏
     */
    public static Bitmap snapShotWithoutStatusBar(Activity activity) {
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bmp = view.getDrawingCache();
        Rect frame = new Rect();
        activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
        int statusBarHeight = frame.top;

        int width = getScreenWidth(activity);
        int height = getScreenHeight(activity);
        Bitmap bp = null;
        bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height
                - statusBarHeight);
        view.destroyDrawingCache();
        return bp;
    }
}