跳转到主界面,相当于按了一下Home键

代码

        @Override
        public boolean onKeyDown(int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_BACK) {
                /**
                 * Starting: Intent { 
                   act=android.intent.action.MAIN 
                   cat=[android.intent.category.HOME
                   ] cmp=com.android.launcher/com.android.launcher2.Launcher } from pid 208
                 */
                //跳转到主界面
                Intent intent = new Intent();
                intent.setAction("android.intent.action.MAIN");
                intent.addCategory("android.intent.category.HOME");
                startActivity(intent);
                finish();
            }
            return super.onKeyDown(keyCode, event);
        }