比较老的actionbar

    public boolean onOptionsItemSelected(MenuItem item) {

        if (item.getItemId() == android.R.id.home) {
            if (isHomeFinish()) {
                finish();
            }
            return super.onOptionsItemSelected(item);
            // return super.onOptionsItemSelected(item);
        }
        return super.onOptionsItemSelected(item);
    }

actionBar = getSupportActionBar();
    actionBar.setTitle("立案呈批");
    actionBar.setDisplayHomeAsUpEnabled(true);

“`
点击图标返回的设置