我的代码获取一个JSON文件，将其转换为QR码并保存该文件。我想做的下一件事是使用ShareActivity机制，让用户通过电子邮件，facebook等共享该文件。
我犯了很多错误，这就是为什么我一直在更新这个问题。在这一点上，我认为我已经设置好了一切，可以告诉我它应该已经设置好了。不幸的是，共享图标是黑色的。我不知道为什么。
我很确定自己在做一些愚蠢的事情，所以我只是在寻找一个可以指引我正确方向的人。
首先菜单XML
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/menu_item_share"
android:icon="@android:drawable/ic_menu_share"
android:title="@string/mnu_share"
app:showAsAction="always"
app:actionProviderClass="android.support.v7.widget.ShareActionProvider" />
</menu>
接下来是“活动”代码（如果我误判了相关内容，则包括了所有内容。）：
public class CreateDineQRCode extends AppCompatActivity {
public final static int WHITE = 0xFFFFFFFF;
public final static int BLACK = 0xFF000000;
public final static int WIDTH = 500;
public final static int HEIGHT = 500;
private final static int MAX_TAG_LEN = 23;
private final static String TAG = "CreateDineQRCode";
//private final static String DINEQRCODE_DIRECTORY = "dineQRCode";
private ShareActionProvider mShareActionProvider;
private String bitmapFilePath = "";
private final static int MY_PERMISSIONS_WRITE_EXTERNAL_STORAGE = 1; // Used for permission callback
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_dine_qrcode);
Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(true);
testJSONCreation();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
final String tag = TAG + ".onCreatedOptions";
// Inflate menu resource file
getMenuInflater().inflate(R.menu.create_dineqr_code_menu, menu);
// Locate MenuItem with ShareActionProvider
MenuItem shareItem = menu.findItem(R.id.menu_item_share);
// Fetch and store ShareActionProvider
Log.d(tag.substring(tag.length() - MAX_TAG_LEN), "fetch and store action provider.");
mShareActionProvider = new ShareActionProvider(this);
MenuItemCompat.setActionProvider(shareItem, mShareActionProvider);
return super.onCreateOptionsMenu(menu);
} // onCreateOptionsMenu()
@Override
public boolean onOptionsItemSelected(MenuItem item) {
String tag = TAG + ".onOptionsItemSelected";
switch (item.getItemId()) {
case R.id.menu_item_share:
//Uri uriToImage = Uri.fromFile(new File(bitmapFilePath));
Intent shareIntent = new Intent();
shareIntent.setAction(Intent.ACTION_SEND);
shareIntent.setType("text/plain");
shareIntent.putExtra(Intent.EXTRA_SUBJECT, "Subject here");
shareIntent.putExtra(Intent.EXTRA_TEXT, "Testing Testing Testing");
Log.d(tag.substring(tag.length() - MAX_TAG_LEN), "Sharing:: Test Text");
startActivity(Intent.createChooser(shareIntent, "Sharing Option"));
return true;
default:
return super.onOptionsItemSelected(item);
}
}
void testJSONCreation() {
final String tag = TAG + ".testJSONCreation";
NutritionRecord rec = NutritionRecord.createTestNutritionRecord();
String jsonText = rec.toJSON();
// find interface elements
TextView jsonTextView = findViewById(R.id.json_code);
ImageView qrCodeView = findViewById(R.id.qr_code_view);
jsonTextView.setText(jsonText);
try {
Bitmap bm = encodeAsBitmap(jsonText);
if (null != bm) {
qrCodeView.setImageBitmap(bm);
if (getPermission()) {
bitmapFilePath = saveImage(bm);
} else {
Log.d(tag.substring(tag.length() - MAX_TAG_LEN),"Unable to get permission");
}
} else {
Log.e(tag.substring(tag.length() - MAX_TAG_LEN), "Error creating bitmap.");
bitmapFilePath = null;
}
} catch (WriterException e) {
e.printStackTrace();
}
} // testJSONCreation()
Bitmap encodeAsBitmap(String str) throws WriterException {
BitMatrix result;
try {
result = new MultiFormatWriter().encode(str,
BarcodeFormat.QR_CODE, WIDTH, HEIGHT, null);
} catch (IllegalArgumentException iae) {
// Unsupported format
return null;
}
int w = result.getWidth();
int h = result.getHeight();
int[] pixels = new int[w * h];
for (int y = 0; y < h; y++) {
int offset = y * w;
for (int x = 0; x < w; x++) {
pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;
}
}
Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, WIDTH, 0, 0, w, h);
return bitmap;
} // encodeAsBitmap()
private String saveImage(Bitmap myBitmap) {
final String tag = TAG + ".saveImage";
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
File qrCodeDirectory; // + "/" + DINEQRCODE_DIRECTORY);
qrCodeDirectory = Environment.getExternalStorageDirectory();
if (!qrCodeDirectory.exists()) {
Log.d(tag.substring(tag.length() - MAX_TAG_LEN), "Directory does not exist. " + qrCodeDirectory.mkdirs());
if (!qrCodeDirectory.mkdirs()) {
Log.e(tag.substring(tag.length() - MAX_TAG_LEN), "Unable to create directory:" + qrCodeDirectory.getAbsolutePath());
return "";
}
}
try {
File f = new File(qrCodeDirectory, "DineQRCode" + Calendar.getInstance()
.getTimeInMillis() + ".jpg");
if (!f.createNewFile()) { //give read write permission
Log.e(tag.substring(tag.length() - MAX_TAG_LEN), "Unable to create file. It already exists.");
return "";
}
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
MediaScannerConnection.scanFile(this,
new String[]{f.getPath()},
new String[]{"image/jpeg"}, null);
fo.close();
Log.d(tag.substring(tag.length() - MAX_TAG_LEN), "File Saved::--->" + f.getAbsolutePath());
return f.getAbsolutePath();
} catch (IOException e1) {
e1.printStackTrace();
}
return "";
} // end saveImage()
private boolean getPermission() {
String tag = TAG + ".getPermission";
boolean result = false;
Log.d(tag.substring(tag.length() - MAX_TAG_LEN), "Entered.");
// First Check to see we have permission
if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
// Permission is not granted
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
Log.d(tag.substring(tag.length() - MAX_TAG_LEN), "Explain why we need permission.");
Snackbar.make(findViewById(R.id.create_dine_qrcode_coord_layout), R.string.write_external_permission_explanation, Snackbar.LENGTH_INDEFINITE).show();
} else {
// No explanation needed; request the permission
Log.d(tag.substring(tag.length() - MAX_TAG_LEN), "Request WRITE_EXTERNAL_STORAGE permission");
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
MY_PERMISSIONS_WRITE_EXTERNAL_STORAGE);
}
} else {
Log.d(tag.substring(tag.length() - MAX_TAG_LEN), "WRITE_EXTERNAL_STORAGE: Permission granted.");
result = true;
}
return result;
} // end getPermission()
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
String tag = TAG + ".onRequestPermissionsResult";
Log.d(tag.substring(tag.length() - MAX_TAG_LEN),"entered.");
switch (requestCode) {
case MY_PERMISSIONS_WRITE_EXTERNAL_STORAGE: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// contacts-related task you need to do.
Log.d(tag.substring(tag.length() - MAX_TAG_LEN), "Permission granted");
} else {
Log.d(tag.substring(tag.length() - MAX_TAG_LEN), "Permission NOT granted.");
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return;
}
// other 'case' lines to check for other
// permissions this app might request.
}
} // end onRequestPermissionResult()
}
答案 0 :(得分：0)
问题似乎是我离开CreateOptionsMenu（）之前没有Intent设置。
这很笨拙，会重做，但是以下方法可以解决
。 @Override
public boolean onCreateOptionsMenu(Menu menu) {
final String tag = TAG + ".onCreatedOptions";
// Inflate menu resource file
getMenuInflater().inflate(R.menu.create_dineqr_code_menu, menu);
// Locate MenuItem with ShareActionProvider
MenuItem shareItem = menu.findItem(R.id.menu_item_share);
// Fetch and store ShareActionProvider
Log.d(tag.substring(tag.length() - MAX_TAG_LEN), "fetch and store action provider.");
mShareActionProvider = new ShareActionProvider(this);
mShareIntent = new Intent();
updateShareIntent();
mShareActionProvider.setShareIntent(mShareIntent);
MenuItemCompat.setActionProvider(shareItem, mShareActionProvider);
shareItem.setEnabled(true);
if (shareItem.isEnabled()) {
Log.d(tag.substring(tag.length() - MAX_TAG_LEN), "shareItem is enabled.");
}
return super.onCreateOptionsMenu(menu);
} // onCreateOptionsMenu()
void updateShareIntent() {
mShareIntent.setAction(Intent.ACTION_SEND);
mShareIntent.setType("text/plain");
mShareIntent.putExtra(Intent.EXTRA_SUBJECT, "Subject here");
mShareIntent.putExtra(Intent.EXTRA_TEXT, "Testing Testing Testing");
}
仍然存在的一个问题是图标仍然很暗。我确定我会弄清楚的。