Intent.putExtras() just return null-CodePudding

I'm trying to send the intent.putString to other class but it's not working I don't know why

trigger.setOnClickListener( v-> {
    Bundle bundle = new Bundle();
    bundle.putString("params", "okay");
    Intent intent = new Intent(this, MainActivity.class);
    intent.putExtras(bundle);

    //finishAffinity();
    startActivityForResult(intent,0);

});

when the button clicked I send bundle to mainActivity

and I get message from mainactivity oncreate.

Bundle extras = this.getIntent().getExtras();

       if(extras != null ) {
           String _getData = extras.getString("param1");
           Log.i(TAG, "face detect message "   _getData);
       }

but I can't get any message on MainActivity. plz give me some answer

CodePudding user response：

You should aware that bundle is using key value pair, so if you create

bundle.putString("params", "okay");

the key is params and value is okay

And to get the value you should use the same key.

String _getData = extras.getString("params");

CodePudding user response：

you have to change your params key in the Bundle. Like Below

Bundle extras = this.getIntent().getExtras();

if(extras != null ) {
   String _getData = extras.getString("params");
   Log.i(TAG, "face detect message "   _getData);
}