スクリーンショットを取得して、
SNSに投稿する

    : 
    // スクリーンショット //
    public Bitmap getViewCapture(View view) {
        view.setDrawingCacheEnabled(true);
        // Viewのキャッシュを取得
        Bitmap cache = view.getDrawingCache();
        Bitmap screenShot = Bitmap.createBitmap(cache);
        view.setDrawingCacheEnabled(false);
        return screenShot;
    }
    :

public class ExternalStorageWriter {
    private final String[]          type = new String[] {
            Environment.DIRECTORY_DOCUMENTS,
            Environment.DIRECTORY_DOWNLOADS,
            Environment.DIRECTORY_PICTURES
    };
    private final File[]            path = new File[type.length];
    private File                    file;
    private final Context           context;
    : 

    // コンストラクタ //
    public ExternalStorageWriter(Context context) {
        this.context = context;
        for (int i=0; i< type.length; i++) {
            path[i] = context.getExternalFilesDir(type[i]);
        }
        :
    }

    // ファイル指定 //
    public boolean setFile(String fileName, int type) {
        file = new File(path[type], fileName);
        return file.exists();
    }

    // ファイル書込（bitmap）//
    public void writeFileBitmap(Bitmap bitmap) {
        if (isExternalStorageWritable()) {
            try (FileOutputStream fileOutputStream = new FileOutputStream(file)) {
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fileOutputStream);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    //URI取得
    public Uri getUri(String fileName, int type) {
        file = new File(path[type], fileName);
        return FileProvider.getUriForFile(context,context.getPackageName() + ".fileProvider", file);
    }
    :

<?xml version="1.0" encoding="utf-8"?>
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" tools:ignore="ScopedStorage" />
    :
<application
    :
        <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="${applicationId}.fileProvider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_path"/>
        </provider>
</application>
</manifest>

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="external_files" path="."/>
</paths>

    :
    Context context = getApplicationContext();
    : 
    // メニュー
    ActionMenuView actionMenuView = findViewById(R.id.menu);
    actionMenuView.getMenu().add(Menu.NONE, 0, Menu.NONE,context.getString(R.string.menu_sns));
　　:
    actionMenuView.setOnMenuItemClickListener(menuItem -> {
            itemId = menuItem.getItemId();
            Intent intent;
            switch (itemId) {
                case 0: // SNS投稿
                    ExternalStorageWriter externalStorageWriter = new ExternalStorageWriter(context);
                    externalStorageWriter.setFile("sns.jpeg", 2);
                    externalStorageWriter.writeFileBitmap(getViewCapture(getWindow().getDecorView()));
                    intent = new Intent(Intent.ACTION_SEND).setPackage("com.facebook.katana");
                    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                    intent.setType("image/*");
                    intent.putExtra(Intent.EXTRA_STREAM, externalStorageWriter.getUri("sns.jpeg", 2));
                    intent.putExtra(Intent.EXTRA_TEXT, "ハッシュタグなど、本文を記述します");
                    startActivity(intent);
                    overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
                    break;
               :

<?xml version="1.0" encoding="utf-8"?>
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">
    :

<queries>
    <package android:name="com.facebook.katana" />
    <package android:name="com.twitter.android" />
    <package android:name="com.instagram.android" />
    <intent>
        <action android:name="android.intent.action.ACTION_SEND" />
        <data android:mimeType="image/*" />
    </intent>
</queries>
:
</manifest>