自动点击按钮事件+解决Toast重复出现问题

 private Button btn;
    int i = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn = (Button)findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                i++;
                showToast("ok"+i);
            }
        });
        btn.dispatchTouchEvent(
                MotionEvent.obtain(SystemClock.uptimeMillis(),
                        SystemClock.uptimeMillis(),
                        MotionEvent.ACTION_DOWN,
                        0,
                        0,
                        0));
        btn.dispatchTouchEvent(
                MotionEvent.obtain(SystemClock.uptimeMillis(),
                        SystemClock.uptimeMillis(),
                        MotionEvent.ACTION_UP,
                        0,
                        0,
                        0));
    }
    private Toast mToast;
    public void showToast(String text) {
        if(mToast == null) {
            mToast = Toast.makeText(MainActivity.this, text, Toast.LENGTH_SHORT);
        } else {
            mToast.setText(text);
            mToast.setDuration(Toast.LENGTH_SHORT);
        }
        mToast.show();
    }

    public void cancelToast() {
        if (mToast != null) {
            mToast.cancel();
        }
    }

    public void onBackPressed() {
        cancelToast();
        super.onBackPressed();
    }