public class MainActivity extends AppCompatActivity {
    private int mCount = 0;
    private TextView mShowCount;
    Button button_count;
    TextView show_count;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button_count= (Button) findViewById(R.id.button_count);
        show_count= (TextView) findViewById(R.id.show_count);
        button_count.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mCount ++;
                show_count.setText(Integer.toString(mCount));
            }
        });


    }

    public void countUp(View view) {
    }

    public void ShowToast(View view) {
        Toast toast = Toast.makeText(this, "hello toast", Toast.LENGTH_LONG);
        toast.show();
    }
}