WindowUtils【窗口工具类】

package com.why.project.windowutilsdemo.utils; /**
 * Copyright 2014 Zhenguo Jin (jinzhenguo1990@gmail.com)
 * 

 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 

 * http://www.apache.org/licenses/LICENSE-2.0
 * 

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import android.animation.ValueAnimator;
import android.app.Activity;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.util.DisplayMetrics;
import android.view.Surface;
import android.view.Window;
import android.view.WindowManager;

/**
 * 窗口工具箱
 *
 * @author zhenguo
 */
public final class WindowUtils {

    /**
     * Don‘t let anyone instantiate this class.
     */
    private WindowUtils() {
        throw new Error("Do not need instantiate!");
    }

    /**
     * 获取当前窗口的旋转角度
     *
     * @param activity activity
     * @return int
     */
    public static int getDisplayRotation(Activity activity) {
        switch (activity.getWindowManager().getDefaultDisplay().getRotation()) {
            case Surface.ROTATION_0:
                return 0;
            case Surface.ROTATION_90:
                return 90;
            case Surface.ROTATION_180:
                return 180;
            case Surface.ROTATION_270:
                return 270;
            default:
                return 0;
        }
    }

    /**
     * 当前是否是横屏
     *
     * @param context context
     * @return boolean
     */
    public static final boolean isLandscape(Context context) {
        return context.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE;
    }

    /**
     * 当前是否是竖屏
     *
     * @param context context
     * @return boolean
     */
    public static final boolean isPortrait(Context context) {
        return context.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT;
    }

    /**
     * 调整窗口的透明度  1.0f,0.5f 变暗
     *
     * @param from    from>=0&&from@param to      to>=0&&to@param context 当前的activity
     */
    public static void dimBackground(final float from, final float to, Activity context) {
        final Window window = context.getWindow();
        ValueAnimator valueAnimator = ValueAnimator.ofFloat(from, to);
        valueAnimator.setDuration(500);
        valueAnimator.addUpdateListener(
                new ValueAnimator.AnimatorUpdateListener() {
                    @Override
                    public void onAnimationUpdate(ValueAnimator animation) {
                        WindowManager.LayoutParams params
                                = window.getAttributes();
                        params.alpha = (Float) animation.getAnimatedValue();
                        window.setAttributes(params);
                    }
                });
        valueAnimator.start();
    }

    /**
     * 获取界面方向
     */
    public static int getScreenOrientation(Activity activity) {
        int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
        DisplayMetrics dm = new DisplayMetrics();
        activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
        int width = dm.widthPixels;
        int height = dm.heightPixels;
        int orientation;
        // if the device‘s natural orientation is portrait:
        if ((rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_180) && height > width ||
                (rotation == Surface.ROTATION_90 || rotation == Surface.ROTATION_270) && width > height) {
            switch (rotation) {
                case Surface.ROTATION_0:
                    orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
                    break;
                case Surface.ROTATION_90:
                    orientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
                    break;
                case Surface.ROTATION_180:
                    orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
                    break;
                case Surface.ROTATION_270:
                    orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
                    break;
                default:
                    orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
                    break;
            }
        }
        // if the device‘s natural orientation is landscape or if the device
        // is square:
        else {
            switch (rotation) {
                case Surface.ROTATION_0:
                    orientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
                    break;
                case Surface.ROTATION_90:
                    orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
                    break;
                case Surface.ROTATION_180:
                    orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
                    break;
                case Surface.ROTATION_270:
                    orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
                    break;
                default:
                    orientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
                    break;
            }
        }

        return orientation;
    }
} 

package com.why.project.windowutilsdemo;

import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.why.project.windowutilsdemo.utils.WindowUtils;

public class MainActivity extends AppCompatActivity {

    private TextView tv_show;
    private Button btn_switch;

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

        initViews();
        initEvents();
    }

    @Override
    protected void onResume() {
        super.onResume();
        //横竖屏切换的时候也会执行
        initDatas();
    }

    private void initViews() {
        tv_show = (TextView) findViewById(R.id.tv_show);
        btn_switch = (Button) findViewById(R.id.btn_switch);
    }

    private void initDatas() {
        if (WindowUtils.isLandscape(this)) {
            tv_show.setText("当前处于横屏");
        }
        if (WindowUtils.isPortrait(this)) {
            tv_show.setText("当前处于竖屏");
        }
    }

    private void initEvents() {
        btn_switch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                toggleFullScreen();
            }
        });
    }

    /**
     * 全屏切换，点击全屏按钮
     */
    private void toggleFullScreen() {
        if (WindowUtils.getScreenOrientation(this) == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
            this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        } else {
            this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        }
    }
}