仿Android开发者选项，点七下显示调试界面

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private int clickCount = 0;
private long clickTime = 0;
sevenClickView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        if (clickTime == 0) {
            clickTime = System.currentTimeMillis();
        }
        if (System.currentTimeMillis() - clickTime > 500) {
            clickCount = 0;
        } else {
            clickCount++;
        }
        clickTime = System.currentTimeMillis();
        if (clickCount > 6) {
            // 点七下条件达到，跳到debug界面
        }
    }
});