How to load part of the image base on the height

image = (ImageView)findViewById(R.id.iv);
Bitmap bmp = BitmapFactory.decodeResource(getResources(),R.drawable.ico_star_blue_full);
image.setBackgroundResource(R.drawable.ico_star_blue_empty);
float percent = 0.3f;
int height = (int)(bmp.getHeight() * percent);

Bitmap bmpProgress = bmp.createBitmap(bmp,0,bmp.getHeight()-height,bmp.getWidth(),height);
image.setImageBitmap(bmpProgress);
image.setScaleType(ImageView.ScaleType.FIT_END);

bmp.getHeight()-height is calculate the start point of the pixel,the top of the start point is 0

Android how to parse the XML

XML Content

/*
<car>
<vacancyinfo capacity="327" vacancy="145"/>
</car>*/

parse Program

xml = connection(SharedUtils.CAR_VACANCY_URL, null);

InputStream inputStream = new    ByteArrayInputStream(xml.getBytes());

DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();

DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();

Document doc = dBuilder.parse(inputStream);

doc.getDocumentElement().normalize();

NodeList vacancyinfoNodeLis = doc.getElementsByTagName("vacancyinfo");

Element vacancyinfo = (Element) vacancyinfoNodeLis.item(0);

String capacity=vacancyinfo.getAttribute("capacity");

String vacancy=vacancyinfo.getAttribute("vacancy");

android move a view

 float wechatIconX = ivWechat.getX();
        int weChatIconWidth = ivWechat.getWidth();
        float wechatIconCenterX = wechatIconX + weChatIconWidth / 2;
        float popupWidthPX = getResources().getDimension(R.dimen.wechatPopUp_width);
        ivWechatPopUp.setX(wechatIconCenterX - popupWidthPX / 2);

Load dimension value from res/values/dimension.xml from source code

In my dimens.xml I have

<dimen name="test">48dp</dimen>
In code If I do

int valueInPixels = (int) getResources().getDimension(R.dimen.test)
this will return 72 which as docs state is multiplied by density of current phone (48dp x 1.5 in my case)

exactly as docs state :

Retrieve a dimensional for a particular resource ID. Unit conversions are based on the current DisplayMetrics associated with the resources.
so if you want exact dp value just as in xml just divide it with DisplayMetrics density

int dp = (int) (getResources().getDimension(R.dimen.test) / getResources().getDisplayMetrics().density)




viewpager without Fragment

https://www.bignerdranch.com/blog/viewpager-without-fragments/

How to set language in Android

use the below class

public class LocaleHelper {

    private static final String SELECTED_LANGUAGE = "Locale.Helper.Selected.Language";

    public static void onCreate(Context context) {

        String lang = getPersistedData(context, Locale.getDefault().getLanguage());

        setLocale(context, lang);

    }

    public static void onCreate(Context context, String defaultLanguage) {

        String lang = getPersistedData(context, defaultLanguage);

        setLocale(context, lang);

    }

    public static String getLanguage(Context context) {

        return getPersistedData(context, Locale.getDefault().getLanguage());

    }

    public static void setLocale(Context context, String language) {

        persist(context, language);

        updateResources(context, language);

    }

    private static String getPersistedData(Context context, String defaultLanguage) {

        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);

        return preferences.getString(SELECTED_LANGUAGE, defaultLanguage);

    }

    private static void persist(Context context, String language) {

        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);

        SharedPreferences.Editor editor = preferences.edit();

        editor.putString(SELECTED_LANGUAGE, language);

        editor.apply();

    }

    private static void updateResources(Context context, String language) {

        Locale locale = new Locale(language);

        Locale.setDefault(locale);

        Resources resources = context.getResources();

        Configuration configuration = resources.getConfiguration();

        configuration.locale = locale;

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

    }

}

How to use?

In Application

  public void onCreate() {

        super.onCreate();

        LocaleHelper.onCreate(this, "en");

 @Override

    public void onConfigurationChanged(Configuration newConfig) {

        super.onConfigurationChanged(newConfig);

        LocaleHelper.setLocale(this, LocaleHelper.getLanguage(this));

    }

Set the language

LocaleHelper.setLocale(this, "en");

How to change the language without restart the activity

LocaleHelper.setLocale(this, "zh");

set the text that you can see

e.g.

tvEn.setText(getContext().getString(R.string.en));

        tvTc.setText(getContext().getString(R.string.tc));

        tvChangePsw.setText(getContext().getString(R.string.change_psw));

        tvChangeLang.setText(getContext().getString(R.string.change_lang));

        tvPushNote.setText(getContext().getString(R.string.push_notic));

        tvPromotion.setText(getContext().getString(R.string.promotion));

        tvHealthTips.setText(getContext().getString(R.string.health_tips));

        tvLogout.setText(getContext().getString(R.string.logout));

How to use Realm

Intsall

https://realm.io/docs/java/latest/#getting-started

Create Models

https://realm.io/docs/java/latest/#models

public class User extends RealmObject {    private String          name;    private int             age;    @Ignore    private int             sessionId;    // Standard getters & setters generated by your IDE…    public String getName() { return name; }    public void   setName(String name) { this.name = name; }    public int    getAge() { return age; }    public void   setAge(int age) { this.age = age; }    public int    getSessionId() { return sessionId; }    public void   setSessionId(int sessionId) { this.sessionId = sessionId; } }

How to write

Realm realm = Realm.getDefaultInstance();

way 1

realm.beginTransaction(); User user = realm.createObject(User.class); // Create a new object user.setName("John"); user.setEmail("john@corporation.com"); realm.commitTransaction();

way 2

not block the UI thread

realm.executeTransactionAsync(new Realm.Transaction() {            @Override            public void execute(Realm bgRealm) {                User user = bgRealm.createObject(User.class);                user.setName("John");                user.setEmail("john@corporation.com");            }        }, new Realm.Transaction.OnSuccess() {            @Override            public void onSuccess() {                // Transaction was a success.            }        }, new Realm.Transaction.OnError() {            @Override            public void onError(Throwable error) {                // Transaction failed and was automatically canceled.            }        });

if use primary key

@PrimaryKey    private String name; final String name = edName.getText().toString();                final String old = edOld.getText().toString();                Realm.Transaction transaction = new Realm.Transaction() {                    @Override                    public void execute(Realm bgrealm) {                        User user = new User(name, old);                        bgrealm.copyToRealmOrUpdate(user);                    }                };

How to query

RealmResults<User> result2 = realm.where(User.class)                                  .equalTo("name", "John")                                  .or()                                  .equalTo("name", "Peter")                                  .findAll(); result.get(result.size() - 1);

condition

between(), greaterThan(), lessThan(), greaterThanOrEqualTo() & lessThanOrEqualTo() equalTo() & notEqualTo() contains(), beginsWith() & endsWith() isNull() & isNotNull() isEmpty() & isNotEmpty()

and   or

Each condition is implicitly logical-and together. Logical-or must be applied explicitly with or().

RealmResults<User> r = realm.where(User.class)                            .greaterThan("age", 10)  //implicit AND                            .beginGroup()                                .equalTo("name", "Peter")                                .or()                                .contains("name", "Jo")                            .endGroup()                            .findAll();

other…

https://realm.io/docs/java/latest/#sorting

Sorting

RealmResults<User> result = realm.where(User.class).findAll(); result.sort("age"); // Sort ascending result.sort("age", RealmResults.SORT_ORDER_DESCENDING);

Auto-Updating Results

auto-updating views into the underlying data, which means results never have to be re-fetched

result = realm.where(User.class).findAll();             result.addChangeListener(new RealmChangeListener<RealmResults<User>>() {            @Override            public void onChange(RealmResults<User> element) {                useResultToSetTheUi(element);            }        });

Delete

// obtain the results of a query final RealmResults<Dog> results = realm.where(Dog.class).findAll(); // All changes to data must happen in a transaction realm.executeTransaction(new Realm.Transaction() {    @Override    public void execute(Realm realm) {        // remove single match        results.deleteFirstFromRealm();        results.deleteLastFromRealm();        // remove a single object        Dog dog = results.get(5);        dog.deleteFromRealm();        // Delete all matches        results.deleteAllFromRealm();    } });

Thread

Using a Realm across Threads
The only rule to using Realm across threads is to remember that Realm, RealmObject or RealmResults instances cannot be passed across threads

Learn how to work with Android

https://realm.io/docs/java/latest/#working-with-android

use with RxJava

can see https://bng86.gitbooks.io/android-third-party-/content/realm.html

Android handle Android 6.0 permission

PROTECTION_NORMAL类权限

当用户安装或更新应用时，系统将授予应用所请求的属于 PROTECTION_NORMAL 的所有权限（安装时授权的一类基本权限）。这类权限包括
android.permission.ACCESS_LOCATION_EXTRA_COMMANDS
android.permission.ACCESS_NETWORK_STATE
android.permission.ACCESS_NOTIFICATION_POLICY
android.permission.ACCESS_WIFI_STATE
android.permission.ACCESS_WIMAX_STATE
android.permission.BLUETOOTH
android.permission.BLUETOOTH_ADMIN
android.permission.BROADCAST_STICKY
android.permission.CHANGE_NETWORK_STATE
android.permission.CHANGE_WIFI_MULTICAST_STATE
android.permission.CHANGE_WIFI_STATE
android.permission.CHANGE_WIMAX_STATE
android.permission.DISABLE_KEYGUARD
android.permission.EXPAND_STATUS_BAR
android.permission.FLASHLIGHT
android.permission.GET_ACCOUNTS
android.permission.GET_PACKAGE_SIZE
android.permission.INTERNET
android.permission.KILL_BACKGROUND_PROCESSES
android.permission.MODIFY_AUDIO_SETTINGS
android.permission.NFC
android.permission.READ_SYNC_SETTINGS
android.permission.READ_SYNC_STATS
android.permission.RECEIVE_BOOT_COMPLETED
android.permission.REORDER_TASKS
android.permission.REQUEST_INSTALL_PACKAGES
android.permission.SET_TIME_ZONE
android.permission.SET_WALLPAPER
android.permission.SET_WALLPAPER_HINTS
android.permission.SUBSCRIBED_FEEDS_READ
android.permission.TRANSMIT_IR
android.permission.USE_FINGERPRINT
android.permission.VIBRATE
android.permission.WAKE_LOCK
android.permission.WRITE_SYNC_SETTINGS
com.android.alarm.permission.SET_ALARM
com.android.launcher.permission.INSTALL_SHORTCUT
com.android.launcher.permission.UNINSTALL_SHORTCUT

The permission that need to handle at runtime

use library:

https://github.com/mukeshsolanki/App-Runtime-Permissions-Android?utm_source=android-arsenal.com&utm_medium=referral&utm_campaign=3790

example

https://github.com/roy989898/Handle-AndroidM-Permission