Android 截图功能实现

Android 截图功能实现

• 简介
• 效果图
• 功能实现
• • 1. 截取当前可见范围屏幕
  • 2. 截取当前可见范围屏幕（不包含状态栏）
  • 3. 截取某个控件
  • 4. 截取ScrollView
  • 5. 长截图
  • 6. 截屏动画效果
  • 7. 显示截屏结果，自动消失
  • 6. 完整代码

    简介

    在Android应用中开发截图功能涉及到以下几个步骤：获取屏幕内容、处理截图、保存截图等。

    效果图

    

    

    功能实现

    1. 截取当前可见范围屏幕

    /**
     * 截取当前可见范围屏幕
     */
    private void screenCapture() {
    //        View decorView = getWindow().getDecorView();
    //        decorView.setDrawingCacheEnabled(true);// 清空缓存，可用于实时截图
    //        decorView.buildDrawingCache();
    //        Bitmap screenBitmap = Bitmap.createBitmap(decorView.getDrawingCache());
    //        decorView.setDrawingCacheEnabled(false); // 清空缓存，可用于实时截图
        View decorView = getWindow().getDecorView();
        Bitmap screenBitmap = Bitmap.createBitmap(decorView.getWidth(), decorView.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(screenBitmap);
        decorView.draw(canvas);
        updateImageCapture(screenBitmap);
    }
    

    2. 截取当前可见范围屏幕（不包含状态栏）

    /**
     * 截取当前可见范围屏幕（不包含状态栏）
     */
    private void screenCaptureNoStatusBar() {
        View view = getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        // 获取状态栏高度
        Rect rect = new Rect();
        view.getWindowVisibleDisplayFrame(rect);
        int statusBarH = rect.top;
        // 获取屏幕宽高
        int w = view.getWidth();
        int h = view.getHeight();
        // 去掉状态栏
        Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache(), 0, statusBarH, w, h - statusBarH);
        // 销毁缓存信息
        view.destroyDrawingCache();
        updateImageCapture(bitmap);
    }
    

    3. 截取某个控件

    /**
     * 截取某个控件
     * @param view
     */
    private void screenCapture(View view) {
        Bitmap screenBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(screenBitmap);
        view.draw(canvas);
        updateImageCapture(screenBitmap);
    }
    

    4. 截取ScrollView

    /**
     * 截取ScrollView
     * @param view
     */
    private void screenCapture(ScrollView view) {
        int h = 0;
        for (int i = 0; i  
    5. 长截图
     
    /**
     * 滚屏截长图
     */
    private Runnable scrollRunnable = new Runnable() {
        @SuppressLint("NewApi")
        @Override
        public void run() {
            boolean isToBottom = isScrollToEnd();
            if (isToBottom) {
                Log.i(TAG, "run: to bottom");
                Thread.currentThread().interrupt();
                mHandler.removeCallbacks(scrollRunnable);
                screenCapture(scrollView);
            } else {
                // 未滑动到底部
                int off = linearLayout.getMeasuredHeight() - scrollView.getHeight(); // 判断高度
                if (off > 0) {
                    scrollView.scrollBy(0, 6);
                    if (scrollView.getScaleY() >= off) {
                        Thread.currentThread().interrupt();
                        mHandler.removeCallbacks(scrollRunnable);
                    } else {
                        mHandler.postDelayed(this, 10);
                    }
                }
            }
        }
    };
     
    6. 截屏动画效果
     
    截屏时有一个缩放的动画效果，缩放到右上角。
     
    动画效果文件，/res/anim/scale_animation.xml文件。
    
        
        
    
     
    代码中使用动画效果
    mCardView.startAnimation(animation);
     
    7. 显示截屏结果，自动消失
     
    截屏完成，会将截取的图片显示在界面中，显示截屏3s后会自动消失。
     
    /**
     * 显示截图3s后自动消失
     */
    private Runnable captureViewRunnable = new Runnable() {
        @SuppressLint("NewApi")
        @Override
        public void run() {
            mCardView.clearAnimation();
            mCardView.setVisibility(View.INVISIBLE);
        }
    };
     
    6. 完整代码
     
    布局文件：activity_screenshot.xml。
    
        
        
        
            
        
        
            
        
    
     
    Activity文件：ScreenshotActivity.java。
    public class ScreenshotActivity extends AppCompatActivity {
        private static final String TAG = "ScreenshotActivity";
        private ScrollView scrollView;
        private LinearLayout linearLayout;
        private ImageView ivScreenshots;
        private CardView mCardView;
        private Handler mHandler = new Handler();
        // 截图动画
        private Animation animation;
        // 截图显示的时间，超时后消失
        private static final int CAPTURE_SHOW_TIMEOUT = 3000;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_screenshot);
            scrollView = findViewById(R.id.scroll_view);
            linearLayout = findViewById(R.id.linear_layout);
            ivScreenshots = findViewById(R.id.iv_capture);
            mCardView = findViewById(R.id.cardView);
            Button btnScreenshots = findViewById(R.id.btn_screenshot);
            Button btnLong = findViewById(R.id.bnt_long);
            animation = AnimationUtils.loadAnimation(this, R.anim.scale_animation);
            animation.setFillAfter(true);
            // 动态添加textview
            for (int i = 0; i  0) {
                        scrollView.scrollBy(0, 6);
                        if (scrollView.getScaleY() >= off) {
                            Thread.currentThread().interrupt();
                            mHandler.removeCallbacks(scrollRunnable);
                        } else {
                            mHandler.postDelayed(this, 10);
                        }
                    }
                }
            }
        };
        /**
         * 显示截图3s后自动消失
         */
        private Runnable captureViewRunnable = new Runnable() {
            @SuppressLint("NewApi")
            @Override
            public void run() {
                mCardView.clearAnimation();
                mCardView.setVisibility(View.INVISIBLE);
            }
        };
        /**
         * 截取当前可见范围屏幕
         */
        private void screenCapture() {
    //        View decorView = getWindow().getDecorView();
    //        decorView.setDrawingCacheEnabled(true);// 清空缓存，可用于实时截图
    //        decorView.buildDrawingCache();
    //        Bitmap screenBitmap = Bitmap.createBitmap(decorView.getDrawingCache());
    //        decorView.setDrawingCacheEnabled(false); // 清空缓存，可用于实时截图
            View decorView = getWindow().getDecorView();
            Bitmap screenBitmap = Bitmap.createBitmap(decorView.getWidth(), decorView.getHeight(), Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(screenBitmap);
            decorView.draw(canvas);
            updateImageCapture(screenBitmap);
        }
        /**
         * 截取某个控件
         * @param view
         */
        private void screenCapture(View view) {
            Bitmap screenBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(screenBitmap);
            view.draw(canvas);
            updateImageCapture(screenBitmap);
        }
        /**
         * 截取ScrollView
         * @param view
         */
        private void screenCapture(ScrollView view) {
            int h = 0;
            for (int i = 0; i = lastChildBottom) {
                // scrollTo 和 scrollTo 不是同时回调，所以添加两个逻辑都可（可根据需要决定是否需要使用两个逻辑组合）
                // 已滑动到底部
                return true;
            } else {
                return false;
            }
        }
    }
     
    截图动画文件：scale_animation.xml。