init

.gitignore

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+#built application files
+*.apk
+*.ap_
+
+# files for the dex VM
+*.dex
+
+# Java class files
+*.class
+
+# generated files
+bin/
+gen/
+
+# Local configuration file (sdk path, etc)
+local.properties
+key.properties
+
+# Windows thumbnail db
+Thumbs.db
+
+# OSX files
+.DS_Store
+
+# Eclipse project files
+.classpath
+.project
+
+# Android Studio
+.idea
+#.idea/workspace.xml - remove # and delete .idea if it better suit your needs.
+.gradle
+build/
+*.iml

build.gradle

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+apply plugin: 'com.android.library'
+
+android {
+    compileSdkVersion 21
+    buildToolsVersion "21.1.2"
+
+    defaultConfig {
+        minSdkVersion 3
+        targetSdkVersion 21
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+}

src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="de.j4velin.dateFormatSpinner"
+          android:versionCode="1"
+          android:versionName="1.0"/>

src/main/java/de/j4velin/dateFormatSpinner/DateFormatSpinner.java

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+package de.j4velin.dateFormatSpinner;
+
+import android.app.Dialog;
+import android.content.Context;
+import android.content.Intent;
+import android.content.res.TypedArray;
+import android.net.Uri;
+import android.text.Editable;
+import android.text.TextWatcher;
+import android.text.format.DateFormat;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.Window;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.EditText;
+import android.widget.Spinner;
+import android.widget.TextView;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+
+public class DateFormatSpinner extends Spinner {
+
+    public final static String[] DEFAULT_TIME_FORMATS = new String[]{"HH:mm", "hh:mm aa"};
+    public final static String[] DEFAULT_DATE_FORMATS =
+            new String[]{"MM/dd", "dd.MM.", "EEEE, dd. MMM", "EEEE, dd. MMMM", "EEE, dd. MMMM",
+                    "EEEE, MMM/dd", "EEEE, MMMM/dd", "EEE, MMMM/dd", "dd.MM.yyyy", "dd. MMMM yyyy",
+                    "MM/dd/yy"};
+
+    private final String[] formats;
+    private final Context c;
+    private String custom;
+
+    private boolean programmaticallySet = false;
+
+    public DateFormatSpinner(final Context context, final AttributeSet attrs) {
+        super(context, attrs);
+        this.c = context;
+        TypedArray a = context.getTheme()
+                .obtainStyledAttributes(attrs, R.styleable.DateFormatSpinner, 0, 0);
+        int defaultFormats = 0;
+        try {
+            defaultFormats = a.getInteger(R.styleable.DateFormatSpinner_defaultFormats, 0);
+        } finally {
+            a.recycle();
+        }
+        this.formats = defaultFormats == 0 ? DEFAULT_TIME_FORMATS : DEFAULT_DATE_FORMATS;
+        init();
+
+        // set defaults
+        if (formats == DEFAULT_TIME_FORMATS) {
+            setSelection(DateFormat.is24HourFormat(c) ? 0 : 1);
+        } else {
+            Locale setLocale = Locale.getDefault();
+            if (setLocale.equals(Locale.US) || setLocale.equals(Locale.CHINESE)) {
+                setSelection(0);
+            } else {
+                setSelection(1);
+            }
+        }
+    }
+
+
+    public DateFormatSpinner(final Context context, final String[] formats) {
+        super(context);
+        this.c = context;
+        this.formats = formats;
+        init();
+    }
+
+    private void init() {
+        custom = c.getSharedPreferences("DateFormatSettings", Context.MODE_PRIVATE)
+                .getString("custom_" + getId(), formats[0]);
+        setAdapter();
+        setOnItemSelectedListener(new OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(final AdapterView<?> adapterView, final View view, int position, long id) {
+                if (programmaticallySet) {
+                    programmaticallySet = false;
+                    return;
+                }
+                if (position == formats.length) {
+                    final Dialog d = new Dialog(c);
+                    d.requestWindowFeature(Window.FEATURE_NO_TITLE);
+                    d.setContentView(R.layout.custom_dialog);
+                    d.findViewById(R.id.explain).setOnClickListener(new OnClickListener() {
+                        @Override
+                        public void onClick(final View v) {
+                            c.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(
+                                    "http://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html"))
+                                    .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
+                        }
+                    });
+                    final TextView preview = (TextView) d.findViewById(R.id.preview);
+                    final EditText text = (EditText) d.findViewById(R.id.text);
+                    text.addTextChangedListener(new TextWatcher() {
+                        @Override
+                        public void beforeTextChanged(final CharSequence s, int start, int count, int after) {
+                        }
+
+                        @Override
+                        public void onTextChanged(final CharSequence s, int start, int before, int count) {
+                            try {
+                                preview.setText(
+                                        new SimpleDateFormat(s.toString()).format(new Date()));
+                            } catch (Exception e) {
+                                preview.setText("ERROR - Invalid format");
+                            }
+                        }
+
+                        @Override
+                        public void afterTextChanged(final Editable editable) {
+                        }
+                    });
+                    text.setText(custom);
+                    d.findViewById(R.id.ok).setOnClickListener(new View.OnClickListener() {
+                        @Override
+                        public void onClick(final View v) {
+                            try {
+                                new SimpleDateFormat(text.getText().toString()).format(new Date());
+                                custom = text.getText().toString();
+                                c.getSharedPreferences("DateFormatSettings", Context.MODE_PRIVATE)
+                                        .edit().putString("custom_" + getId(), custom).commit();
+                            } catch (Exception e) {
+                            }
+                            d.dismiss();
+                        }
+                    });
+                    d.show();
+                }
+            }
+
+            @Override
+            public void onNothingSelected(final AdapterView<?> adapterView) {
+
+            }
+        });
+    }
+
+    private void setAdapter() {
+        super.setAdapter(new DateTimeFormatAdapter());
+    }
+
+    public String getValue() {
+        if (getSelectedItemPosition() < formats.length) {
+            return formats[getSelectedItemPosition()];
+        } else {
+            return custom;
+        }
+    }
+
+    public void setValue(final String v) {
+        for (int i = 0; i < formats.length; i++) {
+            if (formats[i].equals(v)) {
+                setSelection(i);
+                return;
+            }
+        }
+        programmaticallySet = true; // don't show dialog
+        custom = v;
+        c.getSharedPreferences("DateFormatSettings", Context.MODE_PRIVATE).edit()
+                .putString("custom_" + getId(), custom).commit();
+        setSelection(formats.length);
+    }
+
+    private class DateTimeFormatAdapter extends ArrayAdapter<String> {
+
+        public DateTimeFormatAdapter() {
+            super(c, android.R.layout.simple_spinner_dropdown_item);
+            Date now = new Date();
+            SimpleDateFormat sdf = new SimpleDateFormat();
+            for (String format : formats) {
+                sdf.applyPattern(format);
+                add(sdf.format(now));
+            }
+            add("custom");
+        }
+    }
+}

src/main/res/layout/custom_dialog.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:orientation="vertical"
+              android:padding="10dp"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent">
+
+    <TextView
+        android:id="@+id/explain"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/identifiers"/>
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:padding="10dp"
+        android:id="@+id/preview"/>
+
+    <EditText
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:id="@+id/text"/>
+
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_horizontal"
+        android:text="@android:string/ok"
+        android:id="@+id/ok"/>
+</LinearLayout>

src/main/res/values/attrs.xml

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+<resources>
+    <declare-styleable name="DateFormatSpinner">
+        <attr name="defaultFormats" format="enum">
+            <enum name="time" value="0"/>
+            <enum name="date" value="1"/>
+        </attr>
+    </declare-styleable>
+</resources>

src/main/res/values/strings.xml

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+<resources>
+    <string name="identifiers">For available identifiers, see <a href="http://developer.android.com/reference/java/text/SimpleDateFormat.html">SimpleDateFormat</a>.\nPreview:</string>
+</resources>