Android：截取視圖的截圖，保存圖像並檢索它

Question

我基本上試圖在我的活動中捕獲相對布局的屏幕截圖並將其保存為 PNG 圖像。 然后我需要將它作為位圖文件檢索。 我寫了一些代碼來完成這項工作，但遺憾的是屏幕截圖沒有保存在我的設備上。

XML

<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/parent"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- Other views -->

</RelativeLayout>

代碼：

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

        //The view that needs to be captured as an image
        parent = (RelativeLayout) findViewById(R.id.parent);

        Bitmap image = getBitmapFromView(parent);
}

public static Bitmap getBitmapFromView(View view) {
        Date now = new Date();
        android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", now);
        Bitmap returnBitmap = null;

        try {

            String mPath = Environment.getExternalStorageDirectory().toString() + "/" + now + ".jpg";

            view.setDrawingCacheEnabled(true);
            Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
            view.setDrawingCacheEnabled(false);

            File imageFile = new File(mPath);

            FileOutputStream outputStream = new FileOutputStream(imageFile);
            int quality = 100;
            bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream);
            outputStream.flush();
            outputStream.close();

            //Retrieve the image as a Bitmap and return it
            if(imageFile.exists()){
                returnBitmap = BitmapFactory.decodeFile(imageFile.getAbsolutePath());
            }

        } catch (Throwable e) {
            // Several error may come out with file handling or OOM
            e.printStackTrace();
        }
        return returnBitmap;
    }

上面的代碼不起作用。 沒有錯誤，但未捕獲和保存視圖。 有人可以指出問題或給我一個更好的解決方案嗎？

Answer 1

1. 首先為相關視圖分配一個id

2. 使用findViewById()獲取引用然后按照此代碼段進行操作

//定義一個帶有View的高度和寬度的位圖

Bitmap viewBitmap = Bitmap.createBitmap(v.getWidth(),v.getHeight(),Bitmap.Config.RGB_565);

Canvas viewCanvas = new Canvas(viewBitmap);

//get background of canvas
Drawable backgroundDrawable = v.getBackground();

if(backgroundDrawable!=null){
backgroundDrawable.draw(viewCanvas);//draw the background on canvas;
}
else{
viewCanvas.drawColor(Color.GREEN);
//draw on canvas
v.draw(viewCanvas) 
}

//write the above generated bitmap  to a file
String fileStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        OutputStream outputStream = null;
        try{
            imgFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),fileStamp+".png");
            outputStream = new FileOutputStream(imgFile);
            b.compress(Bitmap.CompressFormat.PNG,40,outputStream);
            outputStream.close();
        }
        catch(Exception e){
            e.printStackTrace();
        }

用 JPEG 替換 PNG

不要忘記添加此權限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

希望這可以幫助 ：）