Android截屏、保存、分享

原理：将截取到的Bitmap赋给Dialog上的ImageView，并对Dialog加了弹出和收起的动画，实现截屏效果。

首先创建一个layout名为show_cut_screen_layout用于弹出截图对话框，上面是一个image，下面是横向线性布局的两个button。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:id="@+id/btn_layout"
        android:layout_alignParentBottom="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/share_img"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@color/viewfinder_mask"
            android:text="分享" />

        <Button
            android:id="@+id/share_cancel"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@color/colorAccent"
            android:text="取消" />
    </LinearLayout>
    <ImageView
        android:id="@+id/show_cut_screen_img"
        android:layout_above="@id/btn_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</RelativeLayout>

然后设置对话框弹出的style：

进入values——style.xml里面添加如下代码：

 <!--弹出对话框动画-->
    <style name="dialogWindowAnim" parent="android:Animation" mce_bogus="1">
        <item name="android:windowEnterAnimation">@anim/popview_in_amin</item>
        <item name="android:windowExitAnimation">@anim/popview_out_amin</item>
    </style>

接下来在res文件夹下新建一个anim文件夹用于保存对话框弹出和收起动画：

在里面新建popview_in_amin.xml   :

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <scale
        android:interpolator="@android:anim/accelerate_interpolator"
        android:fromXScale="0.0"
        android:toXScale="1.0"
        android:fromYScale="0.0"
        android:toYScale="1.0"
        android:pivotX="50%"
        android:pivotY="50%"
        android:fillAfter="false"
        android:duration="200"/>
</set>

和popview_out_amin.xml   ：

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <scale
        android:interpolator="@android:anim/accelerate_interpolator"
        android:fromXScale="1.0"
        android:toXScale="1.0"
        android:fromYScale="1.0"
        android:toYScale="0.0"
        android:pivotX="0%"
        android:pivotY="100%"
        android:fillAfter="false"
        android:duration="200"/>
</set>

接下来是java代码：

//截屏功能
    private void popShotSrceenDialog(){
        final AlertDialog cutDialog = new AlertDialog.Builder(this).create();
        View dialogView = View.inflate(this, R.layout.show_cut_screen_layout, null);
        ImageView showImg = (ImageView) dialogView.findViewById(R.id.show_cut_screen_img);
        dialogView.findViewById(R.id.share_cancel).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                cutDialog.dismiss();
            }
        });
        dialogView.findViewById(R.id.share_img).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //分享
                Uri pa=Uri.fromFile(new File(filePath));//根据路径转化为uri
                Intent imageIntent = new Intent(Intent.ACTION_SEND);//调用系统的ACTION_SEND
                imageIntent.setType("image/png");
                imageIntent.putExtra(Intent.EXTRA_STREAM, pa);//EXTRA_STREAM对应转化为uri的path
                startActivity(Intent.createChooser(imageIntent, "分享"));
            }
        });
        //获取当前屏幕的大小
        int width = getWindow().getDecorView().getRootView().getWidth();
        int height = getWindow().getDecorView().getRootView().getHeight();
        //生成相同大小的图片
        Bitmap temBitmap = Bitmap.createBitmap( width, height, Bitmap.Config.ARGB_8888 );
        //找到当前页面的跟布局
        View view = getWindow().getDecorView().getRootView();
        //设置缓存
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        //从缓存中获取当前屏幕的图片
        temBitmap = view.getDrawingCache();
        //保存图片
        if (temBitmap != null)
        {
            try {
                // 获取内置SD卡路径
                String sdCardPath = Environment.getExternalStorageDirectory().getPath();
                // 图片文件路径,获取系统时间
                long time=System.currentTimeMillis();
                SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss ");
                java.util.Date date=new java.util.Date(time);
                String str=sdf.format(date);
                filePath = sdCardPath + File.separator +str+"screenshot.png";

                File file = new File(filePath);
                FileOutputStream os = new FileOutputStream(file);
                temBitmap.compress(Bitmap.CompressFormat.PNG, 100, os);
                os.flush();
                os.close();
            } catch (Exception e) {
                Toast.makeText(be_qrcode.this,"保存失败，请检查权限或清理内存",Toast.LENGTH_SHORT).show();
            }
        }

        showImg.setImageBitmap(temBitmap);

        cutDialog.setView(dialogView);
        Window window = cutDialog.getWindow();
        window.setBackgroundDrawableResource(android.R.color.transparent);
        WindowManager m = window.getWindowManager();
        Display d = m.getDefaultDisplay(); // 获取屏幕宽、高用
        WindowManager.LayoutParams p = window.getAttributes(); // 获取对话框当前的参数值
        p.height = (int) (d.getHeight() * 0.8); // 高度设置为屏幕的0.6
        p.gravity = Gravity.CENTER;//设置弹出框位置
        window.setAttributes(p);
        window.setWindowAnimations(R.style.dialogWindowAnim);
        cutDialog.show();
    }