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how to auto send message on whatsapp in android studio

how when clicked onclick button whatsapp messages can be sent automatically
public void onclick(){
boolean isWhatsappInstalled = whatsappInstalledOrNot("com.whatsapp");
if (isWhatsappInstalled) {
Uri uri = Uri.parse("smsto:" + "628124291xxxx");
Intent sendIntent = new Intent(Intent.ACTION_SENDTO, uri);
sendIntent.putExtra(Intent.EXTRA_TEXT, "hallo");
sendIntent.setPackage("com.whatsapp");
startActivity(sendIntent);
} else {
Toast.makeText(MainActivity.this, "WhatsApp not Installed",
Toast.LENGTH_SHORT).show();
Uri uri = Uri.parse("market://details?id=com.whatsapp");
Intent goToMarket = new Intent(Intent.ACTION_VIEW, uri);
startActivity(goToMarket);
}
}

I don't know if it's the way you want it. I believe it is a way of doing. Try this.
String toNumber = "628124291xxxx";
String url = "https://api.whatsapp.com/send?phone="+ toNumber;
Intent i = new Intent(Intent.ACTION_VIEW);
i.setPackage("com.whatsapp"); //com.whatsapp or com.whatsapp.w4b
i.setData(Uri.parse(url));
startActivity(i);

How can I create implicit Intent for file in Android

I have a XML file on the external storage, and I have different apps which are able to open this file format.
I am going to sent implicit intent like this in order to find apps to open XML file:
public static boolean isIntentAvailable(Context context, Intent intent) {
List<ResolveInfo> list = context.getPackageManager().queryIntentActivities(intent,
PackageManager.MATCH_DEFAULT_ONLY);
return !list.isEmpty();
}
This method has 2 arguments. The question is how to create intent for second argument?
I have only path to file which I need to open and I tried this way:
Intent intent = new Intent(**path to file**);
But it doesn't work... How can I create this intent properly?

You could do something like this:
File file = new File("path to file");
//checking if the File exists
if (file.exists()) {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "text/xml");
//checking if an Activity exists that can handle this Intent
if (intent.resolveActivity(getPackageManager()) != null) {
startActivity(intent);
}
}

Android - How to open a specific folder in a gallery using an implicit intent?

We are building a camera app that saves photos in a specific folder in the gallery. And we have to open the folder of our app in the gallery using an intent. We are using this code however it shows all folders.
View.OnClickListener goToGallery = new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setType("image/*");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
};

To open gallery I use this intent.
public static final int RESULT_GALLERY = 0;
Intent galleryIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(galleryIntent , RESULT_GALLERY );

Try this code.
It will retrieve view pictures under storage/emulated/0/Pictures/MyAppPics
You can change the file path according to your directory path.
File sdDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
File f = new File(sdDir, "MyAppPics");
Intent i = new Intent();
i.setAction(Intent.ACTION_VIEW);
i.setDataAndType(Uri.withAppendedPath(Uri.fromFile(f), "/MyAppPics"), "image/*");
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);

Open url from transparent activity

How to open an url in specifying browser from transparent activity?
I'm using the code:
public void open() {
Log.d("info","start");
Intent i = new Intent();
i.setAction(Intent.ACTION_MAIN);
i.addCategory(Intent.CATEGORY_LAUNCHER);
i.setData(Uri.parse("http://rambler.ru"));
i.setAction("com.android.browser");
ComponentName comp = new ComponentName("com.android.browser", "com.android.browser.BrowserActivity");
i.setComponent(comp);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
getApplicationContext().startActivity(
i);
finish();
}
but it doesn't work.
Browser is already opened

Use below code:
String url= "your url"
final Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(Url));
startActivity(browserIntent);

Open an image in gallery using file path

i have an image file path stored in my database. Now using it i want to open images from SD Card in my gallery. How can i do that. I have seen methods from Uri and using this method but i am getting error
File file = new File(filename);
Uri uri = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
intent.setType("image/*");
startActivity(intent); /** replace with your own uri */
How to fix it,
04-20 08:42:23.516: E/AndroidRuntime(16815): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=file:///mnt/sdcard/My%20App/image_umxto_1.jpg }
best regards

Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(filename)), "image/*");
startActivity(intent);
Use this code and tell me

You can also use the below code:::
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse("file://" + "/sdcard/test.jpg"), "image/*");
startActivity(intent);

you can use the below line to do your task:::
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("content://media/external/images/media/16"))); /** replace with your own uri */

I was getting FileUriExposedException and after some digging found solution. Convert file path to URI and pass it in intent.
MediaScannerConnection.scanFile(getContext(),
new String[] { getImagePath() }, null,
new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
Log.i("onScanCompleted", uri.getPath());
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(uri, "image/*");
startActivity(intent);
}
});
Hope it helps.