android soft keyboard not showing on button click

 

This question already has an answer here:

  • Close/hide the Android Soft Keyboard 69 answers

    • 请试试这个， 

    InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.toggleSoftInput(InputMethodManager.SHOW_FORCED,0);

    尝试这样的事情： 

     InputMethodManager imm = (InputMethodManager)getSystemService(MainActivity.this.INPUT_METHOD_SERVICE);
imm.showSoftInput(mainLayout.getWindowToken(), 0);
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