小知识的积累，方便自己随时查看！
1. android透明度对应百分比数字
| 百分比 | 十六进制 |
|---|---|
| 100% | FF |
| 99% | FC |
| 98% | FA |
| 97% | F7 |
| 96% | F5 |
| 95% | F2 |
| 94% | F0 |
| 93% | ED |
| 92% | EB |
| 91% | E8 |
| 90% | E6 |
| 89% | E3 |
| 88% | E0 |
| 87% | DE |
| 86% | DB |
| 85% | D9 |
| 84% | D6 |
| 83% | D4 |
| 82% | D1 |
| 81% | CF |
| 80% | CC |
| 79% | C9 |
| 78% | C7 |
| 77% | C4 |
| 76% | C2 |
| 75% | BF |
| 74% | BD |
| 73% | BA |
| 72% | B8 |
| 71% | B5 |
| 70% | B3 |
| 69% | B0 |
| 68% | AD |
| 67% | AB |
| 66% | A8 |
| 65% | A6 |
| 64% | A3 |
| 63% | A1 |
| 62% | 9E |
| 61% | 9C |
| 60% | 99 |
| 59% | 96 |
| 58% | 94 |
| 57% | 91 |
| 56% | 8F |
| 55% | 8C |
| 54% | 8A |
| 53% | 87 |
| 52% | 85 |
| 51% | 82 |
| 50% | 80 |
| 49% | 7D |
| 48% | 7A |
| 47% | 78 |
| 46% | 75 |
| 45% | 73 |
| 44% | 70 |
| 43% | 6E |
| 42% | 6B |
| 41% | 69 |
| 40% | 66 |
| 39% | 63 |
| 38% | 61 |
| 37% | 5E |
| 36% | 5C |
| 35% | 59 |
| 34% | 57 |
| 33% | 54 |
| 32% | 52 |
| 31% | 4F |
| 30% | 4D |
| 29% | 4A |
| 28% | 47 |
| 27% | 45 |
| 26% | 42 |
| 25% | 40 |
| 24% | 3D |
| 23% | 3B |
| 22% | 38 |
| 21% | 36 |
| 20% | 33 |
| 19% | 30 |
| 18% | 2E |
| 17% | 2B |
| 16% | 29 |
| 15% | 26 |
| 14% | 24 |
| 13% | 21 |
| 12% | 1F |
| 11% | 1C |
| 10% | 1A |
| 9% | 17 |
| 8% | 14 |
| 7% | 12 |
| 6% | 0F |
| 5% | 0D |
| 4% | 0A |
| 3% | 08 |
| 2% | 05 |
| 1% | 03 |
| 0% | 00 |
2. 代码设置shape背景
public static void createShare(View view, int radiusPx, int strokeWidth, int strokeColor) {
GradientDrawable drawable = new GradientDrawable();
drawable.setCornerRadius(radiusPx);
drawable.setStroke(strokeWidth, strokeColor);
if(Build.VERSION.SDK_INT < 16){
view.setBackgroundDrawable(drawable);
}else{
view.setBackground(drawable);
}
}
创建渐变色
int colors[] = { 0xff255779 , 0xff3e7492, 0xffa6c0cd };//分别为开始颜色，中间夜色，结束颜色
GradientDrawable gd = new GradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, colors);
3. shape xml渐变色属性详解
<gradient
android:angle="90"
android:centerColor="#9ACD32"
android:endColor="#9AC0CD"
android:startColor="#9AFF9A"
android:type="linear"
android:useLevel="false" />
1. android:angle="90"表示渐变的起始位置，这个值必须为45的倍数，包
括0，0表示从左往右渐变，逆时针旋转，依次是45，90，135.....，90表
示从下往上渐变，270表示从上往下渐变，剩下的大家依次去推理。
2. android:startColor="#9AFF9A"，表示渐变的起始颜色
3. android:centerColor="#9ACD32"表示渐变的过渡颜色
4. android:endColor="#9AC0CD"表示渐变的结束颜色
5. type表示渐变的类型，有三种，分别是linear（线性变化）,radial（辐
射渐变）以及sweep（扫描渐变）
当type为radial时，我们要设置android:gradientRadius=""，这个表示渐变
的半径（线性渐变和扫描渐变不需要设置）
4. android 7.x 以上 PopupWindow 的showAsDropDown失效处理方案
a). 重写showAsDropDown方法:
@Override
public void showAsDropDown(View anchor) {
if(Build.VERSION.SDK_INT == 24) {
Rect rect = new Rect();
anchor.getGlobalVisibleRect(rect);
int h = anchor.getResources().getDisplayMetrics().heightPixels - rect.bottom;
setHeight(h);
}
super.showAsDropDown(anchor);
}
b). 使用showAtLocation方法:
if (Build.VERSION.SDK_INT >= 24) {
int[] point = new int[2];
v.getLocationInWindow(point);
mPopWindow.showAtLocation(((Activity) mContext).getWindow().getDecorView(), Gravity.NO_GRAVITY, 0, point[1] + v.getHeight());
} else {
mPopWindow.showAsDropDown(v);
}
5. Android 监听wifi状态-->注册广播(动态注册和静态注册)
class NetworkConnectChangedReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// 这个监听wifi的打开与关闭，与wifi的连接无关
if (WifiManager.WIFI_STATE_CHANGED_ACTION
.equals(intent.getAction())) {
int wifiState = intent
.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0);
EvtLog.e(TAG, "wifiState" + wifiState);
switch (wifiState) {
case WifiManager.WIFI_STATE_DISABLED:
break;
case WifiManager.WIFI_STATE_DISABLING:
break;
case WifiManager.WIFI_STATE_ENABLING:
break;
case WifiManager.WIFI_STATE_ENABLED:
break;
case WifiManager.WIFI_STATE_UNKNOWN:
break;
default:
break;
}
}
// 这个监听wifi的连接状态即是否连上了一个有效无线路由，当上边广播的状态是WifiManager
// .WIFI_STATE_DISABLING，和WIFI_STATE_DISABLED的时候，根本不会接到这个广播。
// 在上边广播接到广播是WifiManager.WIFI_STATE_ENABLED状态的同时也会接到这个广播，
// 当然刚打开wifi肯定还没有连接到有效的无线
if (WifiManager.NETWORK_STATE_CHANGED_ACTION
.equals(intent.getAction())) {
Parcelable parcelableExtra = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
if (null != parcelableExtra) {
NetworkInfo networkInfo = (NetworkInfo) parcelableExtra;
NetworkInfo.State state = networkInfo.getState();
boolean isConnected = state == NetworkInfo.State.CONNECTED;// 当然，这边可以更精确的确定状态
EvtLog.e(TAG, "isConnected" + isConnected);
if (isConnected) {
} else {
}
}
}
//这个监听网络连接的设置，包括wifi和移动数据的打开和关闭。.
//最好用的还是这个监听。wifi如果打开，关闭，以及连接上可用的连接都会接到监听。见log
//这个广播的最大弊端是比上边两个广播的反应要慢，如果只是要监听wifi，我觉得还是用上边两个配合比较合适
if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {
ConnectivityManager manager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
EvtLog.i(TAG, "CONNECTIVITY_ACTION");
assert manager != null;
NetworkInfo activeNetwork = manager.getActiveNetworkInfo();
if (activeNetwork != null) { // connected to the internet
if (activeNetwork.isConnected()) {
if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
// connected to wifi
EvtLog.e(TAG, "当前WiFi连接可用 ");
} else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
// connected to the mobile provider's data plan
EvtLog.e(TAG, "当前移动网络连接可用 ");
}
} else {
EvtLog.e(TAG, "当前没有网络连接，请确保你已经打开网络 ");
}
EvtLog.e(TAG, "info.getTypeName()" + activeNetwork.getTypeName());
EvtLog.e(TAG, "getSubtypeName()" + activeNetwork.getSubtypeName());
EvtLog.e(TAG, "getState()" + activeNetwork.getState());
EvtLog.e(TAG, "getDetailedState()"
+ activeNetwork.getDetailedState().name());
EvtLog.e(TAG, "getDetailedState()" + activeNetwork.getExtraInfo());
EvtLog.e(TAG, "getType()" + activeNetwork.getType());
} else { // not connected to the internet
EvtLog.e(TAG, "当前没有网络连接，请确保你已经打开网络 ");
}
}
}
}
6. 系统activity的打开方式：
-
调用系统分享
//分享文字 public void shareText(View view) { Intent shareIntent = new Intent(); shareIntent.setAction(Intent.ACTION_SEND); shareIntent.putExtra(Intent.EXTRA_TEXT, "This is my Share text."); shareIntent.setType("text/plain"); //设置分享列表的标题，并且每次都显示分享列表 startActivity(Intent.createChooser(shareIntent, "分享到")); } //分享单张图片 public void shareSingleImage(View view) { String imagePath = Environment.getExternalStorageDirectory() + File.separator + "test.jpg"; //由文件得到uri Uri imageUri = Uri.fromFile(new File(imagePath)); Log.d("share", "uri:" + imageUri); //输出：file:///storage/emulated/0/test.jpg Intent shareIntent = new Intent(); shareIntent.setAction(Intent.ACTION_SEND); shareIntent.putExtra(Intent.EXTRA_STREAM, imageUri); shareIntent.setType("image/*"); startActivity(Intent.createChooser(shareIntent, "分享到")); } //分享多张图片 public void shareMultipleImage(View view) { ArrayList<Uri> uriList = new ArrayList<>(); String path = Environment.getExternalStorageDirectory() + File.separator; uriList.add(Uri.fromFile(new File(path+"australia_1.jpg"))); uriList.add(Uri.fromFile(new File(path+"australia_2.jpg"))); uriList.add(Uri.fromFile(new File(path+"australia_3.jpg"))); Intent shareIntent = new Intent(); shareIntent.setAction(Intent.ACTION_SEND_MULTIPLE); shareIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uriList); shareIntent.setType("image/*"); startActivity(Intent.createChooser(shareIntent, "分享到")); } -
系统相机以及系统相册选取功能
-
系统拨号页面的打开方式：
Intent intent =new Intent(); intent.setAction("android.intent.action.CALL_BUTTON"); startActivity(intent); Uri uri = Uri.parse("tel:xxxxxx"); Intent intent = new Intent(Intent.ACTION_DIAL, uri); startActivity(intent); -->到应用 Intent intent= new Intent("android.intent.action.DIAL"); intent.setClassName("com.android.contacts","com.android.contacts.DialtactsActivity"); -
系统通话记录
Intent intent=new Intent(); intent.setAction(Intent.ACTION_CALL_BUTTON); startActivity(intent); -
联系人页面
Intent intent = new Intent(); intent.setAction(Intent.ACTION_VIEW); intent.setData(Contacts.People.CONTENT_URI); startActivity(intent); -->到应用 Intent intent= new Intent("com.android.contacts.action.LIST_STREQUENT"); intent.setClassName("com.android.contacts","com.android.contacts.DialtactsActivity"); -
调用联系人界面
Intent intent = new Intent(); intent.setAction(Intent.ACTION_PICK); intent.setData(Contacts.People.CONTENT_URI); startActivity(intent); -
插入联系人界面
Intent intent=new Intent(Intent.ACTION_EDIT, Uri.parse("content://com.android.contacts/contacts/"+"1")); startActivity(intent); -
到联系人列表页面
Intent intent = new Intent(Intent.ACTION_INSERT_OR_EDIT); intent.setType("vnd.android.cursor.item/person"); intent.setType("vnd.android.cursor.item/contact"); intent.setType("vnd.android.cursor.item/raw_contact"); intent.putExtra(android.provider.ContactsContract.Intents.Insert.NAME, name); intent.putExtra(android.provider.ContactsContract.Intents.Insert.COMPANY,company); intent.putExtra(android.provider.ContactsContract.Intents.Insert.PHONE, tel); intent.putExtra(android.provider.ContactsContract.Intents.Insert.PHONE_TYPE, 3); -
到短信界面
Intent intent = new Intent(Intent.ACTION_VIEW); intent.setType("vnd.android-dir/mms-sms"); //intent.setData(Uri.parse("content://mms-sms/conversations/"));//此为号码 startActivity(intent); -->到应用 Intent intent = new Intent("android.intent.action.CONVERSATION"); startActivity(intent);
7. 即使拉取手机错误日志：
adb bugreport ~/Destop
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