如何将位图保存在缓存中并从缓存中共享？

Question

我有一种方法可以将来自应用程序的位图与第 3 方社交媒体应用程序共享。我正在尝试将我的位图保存到缓存文件夹并从那里共享。这是我的方法：

public void shareMeme(Bitmap bitmap) {
    String path = Objects.requireNonNull(getContext()).getCacheDir().getAbsolutePath();
    Uri uri = Uri.parse(path);

    Intent share = new Intent(Intent.ACTION_SEND);
    share.setType("image/*");
    share.putExtra(Intent.EXTRA_STREAM, uri);
    share.putExtra(Intent.EXTRA_TEXT, "This is my Meme");
    getContext().startActivity(Intent.createChooser(share, "Share Your Meme!"));

    Toast.makeText(getContext(), "The Cache drive is: " + path, Toast.LENGTH_LONG).show();
}

该方法通过其参数从另一个方法获取位图。我想知道如何将 shareMeme(Bitmap bitmap) 参数与上述代码合并。

更新

AndroidManifest.xml:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.example.omar.memegenerator">

    ...

    <application
        ...
        <provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="com.example.omar.memegenerator.fileprovider"
            android:grantUriPermissions="true"
            android:exported="false">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/filepaths" />
        </provider>
        ...
    </application>

</manifest>

新的shareMeme(Bitmap bitmap)方法：

    public void shareMeme(Bitmap bitmap) {
    String path = Objects.requireNonNull(getContext()).getCacheDir().getAbsolutePath();
    File file = new File(path + "/Memes/" + timeStamp + counter + ".jpg");
    Uri uri = FileProvider.getUriForFile(getContext(), "com.example.omar.memegenerator.fileprovider", file);
    try {
        OutputStream stream = new FileOutputStream(file);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
        stream.flush();
        stream.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    Intent share = new Intent(Intent.ACTION_SEND);
    share.setType("image/*");
    share.putExtra(Intent.EXTRA_STREAM, uri);
    share.putExtra(Intent.EXTRA_TEXT, "This is my Meme");
    share.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    getContext().startActivity(Intent.createChooser(share, "Share Your Meme!"));

    Toast.makeText(getContext(), "The Cache drive is: " + path, Toast.LENGTH_LONG).show();
}

堆栈跟踪：

2019-04-09 05:08:51.324 19288-19288/com.example.omar.memegenerator E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.omar.memegenerator, PID: 19288
    java.lang.IllegalArgumentException: Failed to find configured root that contains /data/data/com.example.omar.memegenerator/cache/Memes/201904090.jpg
        at android.support.v4.content.FileProvider$SimplePathStrategy.getUriForFile(FileProvider.java:739)
        at android.support.v4.content.FileProvider.getUriForFile(FileProvider.java:418)
        at com.example.omar.memegenerator.TopImageFragment.shareMeme(TopImageFragment.java:232)
        at com.example.omar.memegenerator.TopImageFragment.onReceive(TopImageFragment.java:303)
        at android.support.v4.content.LocalBroadcastManager.executePendingBroadcasts(LocalBroadcastManager.java:313)
        at android.support.v4.content.LocalBroadcastManager.handleMessage(LocalBroadcastManager.java:121)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6703)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:769)

Answer 1

第 1 步：在 Bitmap 上使用 compress() 将其保存到 getCacheDir()

中的文件

第 2 步：将 FileProvider 添加到您的项目，配置为提供来自 getCacheDir()

的文件

第 3 步：使用 FileProvider.getUriForFile() 而不是您现有的代码来获取 Uri 以放入 EXTRA_STREAM

第 4 步：在调用 startActivity() 之前将 Intent.FLAG_GRANT_READ_URI_PERMISSION 添加到 Intent，以便收件人有权访问您的内容

如何将位图保存在缓存中并从缓存中共享？

How to save a bitmap in and share from cache?

java

android

caching

uri

bitmap