我可以从 Android 设备信息屏幕获取捕获的图像吗？

Question

Intent setting = new Intent(Settings.ACTION_DEVICE_INFO_SETTINGS);

You can display the Android device information screen with the above code.

But when I run the code that captures the screen and saves the image, I get nothing.

I think this is for security reasons, but I need that feature. Is it possible in another way?

private void takeScreenshot(View v1) {
        Date now = new Date();
        android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", now);

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

            v1.setDrawingCacheEnabled(true);
            Bitmap bitmap = Bitmap.createBitmap(v1.getDrawingCache());
            v1.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();
        } catch (Throwable e) {
            e.printStackTrace();
        }
    }

This is the capture code I tried.

v1.setDrawingCacheEnabled(true);

put the above code

v1.getDrawingCache()

I don't get anything from the above code.

Answer 1

as per my understanding you want to take screenshot of screen, so try below code,

in xml, step 1)

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click on button to take screenshot"
android:textColor="#000"
android:textSize="20dp"
android:textStyle="bold" />

<Button
android:id="@+id/clickme"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="@color/colorPrimary"
android:text="Click Me" />

and in activity step 2) initiate button and call onclick and add below,

final MediaPlayer mediaPlayer = MediaPlayer.create(this, R.raw.beep);
click.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Toast.makeText(MainActivity.this, "You just Captured a Screenshot," + Toast.LENGTH_SHORT).show();
        screenshot(getWindow().getDecorView().getRootView(), "result");

        mediaPlayer.start();
    }
});

step 3) declare screenshot function,

protected static File screenshot(View view, String filename) {
    Date date = new Date();

// Here we are initialising the format of our image name
    CharSequence format = android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", date);
    try {
// Initialising the directory of storage
        String dirpath = Environment.getExternalStorageDirectory() + "";
        File file = new File(dirpath);
        if (!file.exists()) {
            boolean mkdir = file.mkdir();
        }

// File name
        String path = dirpath + "/" + filename + "-" + format + ".jpeg";
        view.setDrawingCacheEnabled(true);
        Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
        view.setDrawingCacheEnabled(false);
        File imageurl = new File(path);
        FileOutputStream outputStream = new FileOutputStream(imageurl);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 50, outputStream);
        outputStream.flush();
        outputStream.close();
        return imageurl;

    } catch (FileNotFoundException io) {
        io.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

step 4) most remember point ask user to storage permission(WRITE_EXTERNAL_STORAGE). hope it's help.