Android:与其他应用程序共享可绘制资源

问题描述

在我的活动中，我有一个ImageView.我想要，当用户单击它时，将打开一个对话框(如意图对话框)，该对话框显示可以打开图像的应用程序列表，而不是用户可以选择一个应用程序并使用该应用程序显示图像.

In my activity I have an ImageView. I want ,when user click on it, a dialog opens (like intent dialogs) that show list of apps which can open image than user can choose a app and show the image with that app.

我的活动代码:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    ImageView iv = (ImageView) findViewById(R.id.imageid);
    iv.setImageResource(R.drawable.dish);
    iv.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //here is where I want a dialog that I mentioned show
                }
    });
}// end onCreate()

推荐答案

您不能将位图传递给意图.

You can't pass a bitmap to an intent.

根据我的见解，您希望共享资源中的可绘制对象.因此，首先您必须将drawable转换为位图.然后，您必须将位图作为文件保存到外部存储器，然后使用Uri.fromFile(new File(pathToTheSavedPicture))获取该文件的uri，并将该uri传递给这样的意图.

From what I see you want to share a drawable from your resources. So first you have to convert the drawable to a bitmap. And then You have to save the bitmap to the external memory as a file and then get a uri for that file using Uri.fromFile(new File(pathToTheSavedPicture)) and pass that uri to the intent like this.

shareDrawable(this, R.drawable.dish, "myfilename");

public void shareDrawable(Context context,int resourceId,String fileName) {
    try {
        //convert drawable resource to bitmap
        Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), resourceId);

        //save bitmap to app cache folder
        File outputFile = new File(context.getCacheDir(), fileName + ".png");
        FileOutputStream outPutStream = new FileOutputStream(outputFile);
        bitmap.compress(CompressFormat.PNG, 100, outPutStream);
        outPutStream.flush();
        outPutStream.close();
        outputFile.setReadable(true, false);

        //share file
        Intent shareIntent = new Intent(android.content.Intent.ACTION_SEND);
        shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(outputFile));
        shareIntent.setType("image/png");
        context.startActivity(shareIntent);
    }
    catch (Exception e) { Toast.makeText(context, "error", Toast.LENGTH_LONG).show();
    }
}

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