移动开发 \ Android \ Android 小知识

Android 小知识

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简介:版权声明:本文为博主原创文章,未经博主允许不得转载。https://blog.csdn.net/u012691505/article/details/81735860

版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/u012691505/article/details/81735860

//反射获取状态栏ID

private void initStatusBar() {

if (statusBarView == null) {

int identifier = getResources().getIdentifier("statusBarBackground","id","android");

statusBarView = getWindow().findViewById(identifier);

}

if (statusBarView != null) {

statusBarView.setBackgroundResource(R.drawable.home_toolbar_bg);

}

}

private boolean hasStatusBar() {

return true;

}

1.语言切换

Resources resources = getResources();

Configuration configuration = resources.getConfiguration();

if (lang.equals("zh")) {

configuration.setLocale(Locale.CHINESE);

PreferenceUtils.setLang(this,"zh");

} else {

configuration.setLocale(Locale.ENGLISH);

PreferenceUtils.setLang(this,"en");

}

resources.updateConfiguration(configuration,resources.getDisplayMetrics());

this.recreate();

2.版本大小判断

public static boolean isNewestApp(String localVersion,String netVersion) {

if (localVersion.equals(netVersion)) {

return true;

}

if (netVersion.equals("")) {

return true;

}

String[] newVersion = netVersion.split(".");

String[] oldVersion = localVersion.split(".");

int length = oldVersion.length < newVersion.length ? newVersion.length : oldVersion.length;

for (int i = 0; i < length; i++) {

if (Integer.parseInt(newVersion[i]) > Integer.parseInt(oldVersion[i])) {

return false;

} else if (Integer.parseInt(newVersion[i]) < Integer.parseInt(oldVersion[i])) {

return true;

}

// 相等 比较下一组值

}

return false;

}

3.保存文件

public static String decryptedFile(Context context,String name) {

FileInputStream fis = null;

FileOutputStream fos = null;

File file = null;

File files = null;

try {

File dir = new File(AppConfig.getRootPath(context) + "temp/");

if (!dir.exists()) {

dir.mkdirs();

}

if (!TextUtils.isEmpty(name)) {

file = new File(AppConfig.getRootPath(context),name);

files = new File(dir,name);

if (files.exists()) {

files.delete();

files.createNewFile();

} else {

files.createNewFile();

}

}

fis = new FileInputStream(file);

byte[] buf = new byte[2048];

int len = 0;

int total = fis.available();

fos = new FileOutputStream(files);

int i = 0;

while ((len = fis.read(buf)) != -1) {

if (i == 0) {

fos.write(buf,8,len - 8);

} else {

fos.write(buf,len);

}

i++;

}

fos.flush();

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

if (fis != null) fis.close();

if (fos != null) fos.close();

return files.getAbsolutePath();

} catch (IOException e) {

e.printStackTrace();

}

}

return null;

}

4.TabLayout

tabIndicatorColor//选中下划线颜色

tabTextColor//字体颜色

tabSelectedTextColor//选中时文字颜色

5.状态栏透明

if (Build.VERSION.SDK_INT >= 21) {

View decorView = activity.getWindow().getDecorView();

//SYSTEM_UI_FLAG_HIDE_NAVIGATION隐藏底部导航栏

//SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN 全屏

//SYSTEM_UI_FLAG_LAYOUT_STABLE 让应用主题内容占用系统状态栏的空间

//View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION

int options = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE;

decorView.setSystemUiVisibility(options);//设置系统UI的可见性

//设置状态栏和导航栏颜色为透明

activity.getWindow().setStatusBarColor(Color.TRANSPARENT);

}

适配5.0以下

<item name="android:windowBackground">@drawable/tpv_window_background</item>

6.状态栏渐变色

@Override

protected void onCreate(@Nullable Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

Looper.myQueue().addIdleHandler(new MessageQueue.IdleHandler() {

@Override

public boolean queueIdle() {

if (hasStatusBar()) {

initStatusBar();

getWindow().getDecorView().addOnLayoutChangeListener(new View.OnLayoutChangeListener() {

@Override

public void onLayoutChange(View v,int left,int top,int right,int bottom,int oldLeft,int oldTop,int oldRight,int oldBottom) {

initStatusBar();

}

});

}

return false;

}

});

}

//背景代码xml

<shape xmlns:android="http://schemas.android.com/apk/res/android">

<gradient

android:angle="0"

android:endColor="@color/home_toolbar_bg_end"

android:startColor="@color/home_toolbar_bg_start" />

</shape>

7.权限

权限组

权限

权限说明

CALENDAR

READ_CALENDAR

读取日历

WRITE_CALENDAR

修改日历

CAMERA

CAMERA

相机

CONTACTS

READ_CONTACTS

读取手机联系人

WRITE_CONTACTS

写入联系人

GET_ACCOUNTS

允许访问Gmail列表

LOCATION

ACCESS_FINE_LOCATION

允许通过移动网络或WIFI定位

ACCESS_COARSE_LOCATION

允许通过移动网络或WIFI定位

MICROPHONE

RECORD_AUDIO

录音或录制视频

PHONE

READ_PHONE_STATE

允许访问电话状态

CALL_PHONE

允许程序拨打电话

READ_CALL_LOG

读取通话记录

WRITE_CALL_LOG

保存用户的联系人数据

ADD_VOICEMAIL

允许一个应用程序添加语音邮件系统

USE_SIP

允许使用SIP视频服务

PROCESS_OUTGOING_CALLS

允许程序拦截,监视或修改播出电话

SENSORS

BODY_SENSORS

使用的传感器来测量身体变化(心跳)

SMS

SEND_SMS

发送短信

READ_SMS

读取短信

RECEIVE_SMS

允许程序接收短信

RECEIVE_WAP_PUSH

接收WAP PUSH信息

RECEIVE_MMS

接收彩信

STORAGE

READ_EXTERNAL_STORAGE

读取外部存储空间(有写权限后无需添加)

WRITE_EXTERNAL_STORAGE

程序写入外部存储,如SD卡上写文件

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