Question

用户单击按钮后，我要求他拍摄屏幕截图并将其发送给另一个朋友。

button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            View rootView = getWindow().getDecorView().findViewById(android.R.id.content);
            Bitmap bitmap = getScreenShot(rootView);
            File file = store(bitmap,"File-Name");
            shareImage(file);
        }
    });

public static Bitmap getScreenShot(View view) {
    View screenView = view.getRootView();
    screenView.setDrawingCacheEnabled(true);
    Bitmap bitmap = Bitmap.createBitmap(screenView.getDrawingCache());
    screenView.setDrawingCacheEnabled(false);
    return bitmap;
}

public static File store(Bitmap bm, String fileName){
    final String dirPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Screenshots";
    File dir = new File(dirPath);
    if(!dir.exists())
        dir.mkdirs();
    File file = new File(dirPath, fileName);
    try {
        FileOutputStream fOut = new FileOutputStream(file);
        bm.compress(Bitmap.CompressFormat.PNG, 85, fOut);
        fOut.flush();
        fOut.close();
    } catch (Exception e) {
        e.printStackTrace();
    }

    return file;
}
private void shareImage(File file){
    Uri uri = Uri.fromFile(file);
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_SEND);
    intent.setType("image/*");

    intent.putExtra(android.content.Intent.EXTRA_SUBJECT, "");
    intent.putExtra(android.content.Intent.EXTRA_TEXT, "");
    intent.putExtra(Intent.EXTRA_STREAM, uri);
    try {
        startActivity(Intent.createChooser(intent, "Share Screenshot"));
    } catch (ActivityNotFoundException e) {
        Toast.makeText(this, "No App Available", Toast.LENGTH_SHORT).show();
    }
}

我在调试时看到位图值为“”。我的错误消息中也有这些。

Error Log Image

我在清单文件中使用了它们。

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

<provider
    android:name="androidx.core.content.FileProvider"
    android:authorities="${applicationId}.provider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/provider_path" />
</provider>

能帮我吗？

Answer 1

您应该使用此代码

button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                View rootView = getWindow().getDecorView().findViewById(android.R.id.content);
                Bitmap bitmap = getScreenShot(rootView);
                File file = store(bitmap, "name.png");

                if (file.exists()) {
                    shareImage(file);
                } else {
                    Log.e("file exist", "NO");
                }
            }
        });



    public static Bitmap getScreenShot(View view) {
        View screenView = view.getRootView();
        screenView.setDrawingCacheEnabled(true);
        Bitmap bitmap = Bitmap.createBitmap(screenView.getDrawingCache());
        screenView.setDrawingCacheEnabled(false);
        return bitmap;
    }

    public File store(Bitmap bm, String fileName) {
        final String dirPath = getExternalCacheDir().getAbsolutePath() + "/Screenshots";
        File dir = new File(dirPath);
        if (!dir.exists())
            dir.mkdirs();
        File file = new File(dirPath, fileName);
        try {
            FileOutputStream fOut = new FileOutputStream(file);
            bm.compress(Bitmap.CompressFormat.PNG, 85, fOut);
            fOut.flush();
            fOut.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return file;
    }

    private void shareImage(File file) {
        Intent shareIntent = new Intent();
        shareIntent.setAction(Intent.ACTION_SEND);
        shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse(file.getPath()));
        shareIntent.setType("image/*");
        startActivity(Intent.createChooser(shareIntent, "Share Screenshot"));
    }

Answer 2

使用它从视图中捕获位图。使用绘图缓存后，您的方法将不再起作用。

  public drawBitmap(View view, int width, int height) {
        Bitmap bm = Bitmap.createBitmap(width,
                height,
                Bitmap.Config.ARGB_8888)

        Canvas canvas = Canvas(bm)
        canvas.drawColor(previewBgColor)

        view.draw(canvas)

        // Store bitmap in dest file,
        File dstFile = File("path/to/file")

        storeBitmap(dstFile, bm)
  }

  public String storeBitmap(File file, Bitmap bmp) {
      FileOutputStream stream;
       try {
          stream = FileOutputStream(file, false)
          bmp.compress(Bitmap.CompressFormat.JPEG,99,it)
       } catch (e: Exception) {
       
       } finally {
          stream.close()
       }

        return file.path
    }

如果文件异常仍然存在，请通知我们。我认为这是由于位图文件返回“”而引起的错误？ The docs here should be enough to get you through.

Answer 3

我能够用这种结构解决问题。非常感谢P Fuster的帮助。

我们首先将这些权限添加到清单文件中。

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

然后将它们添加到mainActivity中的onCreate方法中。

StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
StrictMode.setVmPolicy(builder.build());

现在让我们给出按钮的点击效果。

share_friends.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            View rootView = getWindow().getDecorView().findViewById(android.R.id.content);
            Bitmap bitmap = getScreenShot(rootView);
            File file = store(bitmap, "name.png");

            if (file.exists()) {
                shareImage(file);
                System.out.println(file.getPath());
            } else {
                Log.e("file exist", "NO");
            }

        }
    });

按钮中使用的功能

public static Bitmap getScreenShot(View view) {
    View screenView = view.getRootView();
    screenView.setDrawingCacheEnabled(true);
    Bitmap bitmap = Bitmap.createBitmap(screenView.getDrawingCache());
    screenView.setDrawingCacheEnabled(false);
    return bitmap;
}

public File store(Bitmap bm, String fileName) {
    final String dirPath = Environment.getExternalStorageDirectory().getPath() + "/Screenshots";
    File dir = new File(dirPath);
    if (!dir.exists())
        dir.mkdirs();
    File file = new File(dirPath, fileName);
    try {
        FileOutputStream fOut = new FileOutputStream(file);
        bm.compress(Bitmap.CompressFormat.PNG, 85, fOut);
        fOut.flush();
        fOut.close();
    } catch (Exception e) {
        e.printStackTrace();
    }

    return file;
}

private void shareImage(File file) {
    Intent shareIntent = new Intent();
    shareIntent.setAction(Intent.ACTION_SEND);
    shareIntent.setType("image/*");
    shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));
    shareIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    startActivity(Intent.createChooser(shareIntent, "Share Screenshot"));
}

这样解决了问题。

发送屏幕截图时出现错误

3 个答案: