Android中的多击事件
16lz
2021-01-23
在android系统中。google提供了一个click事件。只负责相应单次点击。
如果想实现双机或者多击事件的话就需要借鉴下google原生应用的源码了。
在android中,三次点击android的版本图标会出现一个相应版本的logo。
来看看google工程师是怎么写的。
@Override public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) { if (preference.getKey().equals(KEY_FIRMWARE_VERSION)) { System.arraycopy(mHits, 1, mHits, 0, mHits.length-1); mHits[mHits.length-1] = SystemClock.uptimeMillis(); if (mHits[0] >= (SystemClock.uptimeMillis()-500)) { Intent intent = new Intent(Intent.ACTION_MAIN); intent.setClassName("android", com.android.internal.app.PlatLogoActivity.class.getName()); try { startActivity(intent); } catch (Exception e) { Log.e(LOG_TAG, "Unable to start activity " + intent.toString()); } } } else if (preference.getKey().equals(KEY_BUILD_NUMBER)) { // Don't enable developer options for secondary users. if (UserHandle.myUserId() != UserHandle.USER_OWNER) return true; if (mDevHitCountdown > 0) { if (mDevHitCountdown == 1) { if (super.ensurePinRestrictedPreference(preference)) { return true; } } mDevHitCountdown--; if (mDevHitCountdown == 0) { getActivity().getSharedPreferences(DevelopmentSettings.PREF_FILE, Context.MODE_PRIVATE).edit().putBoolean( DevelopmentSettings.PREF_SHOW, true).apply(); if (mDevHitToast != null) { mDevHitToast.cancel(); } mDevHitToast = Toast.makeText(getActivity(), R.string.show_dev_on, Toast.LENGTH_LONG); mDevHitToast.show(); } else if (mDevHitCountdown > 0 && mDevHitCountdown < (TAPS_TO_BE_A_DEVELOPER-2)) { if (mDevHitToast != null) { mDevHitToast.cancel(); } mDevHitToast = Toast.makeText(getActivity(), getResources().getQuantityString( R.plurals.show_dev_countdown, mDevHitCountdown, mDevHitCountdown), Toast.LENGTH_SHORT); mDevHitToast.show(); } } else if (mDevHitCountdown < 0) { if (mDevHitToast != null) { mDevHitToast.cancel(); } mDevHitToast = Toast.makeText(getActivity(), R.string.show_dev_already, Toast.LENGTH_LONG); mDevHitToast.show(); } } return super.onPreferenceTreeClick(preferenceScreen, preference); }
设置设置应用中实现三击的源码。简单的提取一下,可以得到n击事件的源码
private void doubleClick() { final long[] mHits = new long[2]; view.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { System.arraycopy(mHits, 1, mHits, 0, mHits.length - 1); mHits[mHits.length - 1] = SystemClock.uptimeMillis(); if (mHits[0] >= (SystemClock.uptimeMillis() - 500)) { // 双击事件 } } }); }
原理分析:
将每次的点击事件依次存放到一个定长的容器中。再对比第一次跟最后一次之间的时间差,如果满足一定的条件的。就认为是多击事件。