Android Launcher 界面添加未接来电 / 未读短信条数显示

原文首发地址 Android Launcher 界面添加未接来电 / 未读短信条数显示

本文代码基于 Android 6.0（高通），原生不支持未接来电以及未读短信的图标右上角数目显示。

涉及到几个文件：

1. packages/apps/Launcher3/src/com/android/launcher3/Launcher.java
2. packages/apps/Launcher3/src/com/android/launcher3/Utilities.java
3. packages/apps/Launcher3/AndroidManifest.xml

具体的思路：Launcher 中注册 ContentObserver 来监听短信和电话数据库，当数据发生变化时，读取读取数据库未读数目之后通过 ICON_NAME ，重新绘制短信，电话的图标（在原图右上角画圆和数字）。

具体代码：

1. Launcher.java

首先是定义两个 ContentObserver

private final static int UPDATE_MMS_ICON = 826;
private final static int UPDATE_CALL_ICON = 1206;public class SMSContentObserver extends ContentObserver {private Handler mHandler;public SMSContentObserver(Context context, Handler handler) {super(handler);mHandler = handler;}@Overridepublic void onChange(boolean selfChange) {Log.i("Launcher-","SMSContentObserver onChange");mHandler.removeMessages(UPDATE_MMS_ICON);Message msg = mHandler.obtainMessage(UPDATE_MMS_ICON);msg.obj = getMissMmsCount();mHandler.sendMessage(msg);}
}public class CallContentObserver extends ContentObserver {private Handler mHandler;public CallContentObserver(Context context, Handler handler) {super(handler);mHandler = handler;}@Overridepublic void onChange(boolean selfChange) {Log.i("Launcher-","CallContentObserver onChange");mHandler.removeMessages(UPDATE_CALL_ICON);Message msg = mHandler.obtainMessage(UPDATE_CALL_ICON);msg.obj = getMissCallCount();mHandler.sendMessage(msg);}
}

在 onCreate() 中注册 ContentObserver

private SMSContentObserver smsContentObserver = null;
private CallContentObserver callContentObserver = null;  smsContentObserver = new SMSContentObserver(this,mHandler);
callContentObserver =new CallContentObserver(this,mHandler);getContentResolver().registerContentObserver(Calls.CONTENT_URI,true,callContentObserver);
getContentResolver().registerContentObserver(Uri.parse("content://mms-sms/"),true,smsContentObserver);

定义两个 ICON_NAME

// 这两个 ICON_NAME 根据自己实际系统短信和电话页面对应包名填写
private final static String PHONE_ICON_NAME = "com.android.dialer.DialtactsActivity";
private final static String MMS_ICON_NAME = "com.android.messaging.ui.conversationlist.ConversationListActivity";

mHandler 中处理

@Thunk
final Handler mHandler = new Handler(new Handler.Callback() {@Overridepublic boolean handleMessage(Message msg) {Log.i("Launcher-","mHandler msg.what = " + msg.what);if (msg.what == ADVANCE_MSG) {int i = 0;for (View key : mWidgetsToAdvance.keySet()) {final View v = key.findViewById(mWidgetsToAdvance.get(key).autoAdvanceViewId);final int delay = mAdvanceStagger * i;if (v instanceof Advanceable) {mHandler.postDelayed(new Runnable() {public void run() {((Advanceable) v).advance();}}, delay);}i++;}sendAdvanceMessage(mAdvanceInterval);}//ADD BY Bruce Yang FOR SHOW UNREAD MMSelse if (msg.what == UPDATE_MMS_ICON) {setMmsOrPhoneNum(MMS_ICON_NAME, getMissMmsCount());} else if (msg.what == UPDATE_CALL_ICON) {setMmsOrPhoneNum(PHONE_ICON_NAME, getMissCallCount());}return true;}
});

获取数据库中未读数目

 private int getMissMmsCount() {Log.i("Launcher-","getMissMmsCount");int missSmsCount = 0;Cursor cursorSMS = null;Cursor cursorMMS = null;try {cursorSMS = getContentResolver().query(Uri.parse("content://sms"), null, "(read=0 and type=1)",null, null);cursorMMS = getContentResolver().query(Uri.parse("content://mms"), null, "(read=0)", null,null);} catch (SQLiteException e) {return missSmsCount;}if (cursorSMS != null) {missSmsCount = cursorSMS.getCount();cursorSMS.close();}if (cursorMMS != null) {missSmsCount = missSmsCount + cursorMMS.getCount();cursorMMS.close();}Log.i("Launcher-","getMissMmsCount  missSmsCount = " + missSmsCount);return missSmsCount;
}private int getMissCallCount() {Log.i("Launcher-","getMissCallCount");int missCallCount = 0;Uri missingCallUri = Calls.CONTENT_URI;String where = Calls.TYPE + "='" + Calls.MISSED_TYPE + "'"+ " AND new=1";Cursor cursorCall = null;try {cursorCall = getContentResolver().query(missingCallUri,null, where, null, null);} catch (SQLiteException e) {return missCallCount;}if (cursorCall != null) {missCallCount = cursorCall.getCount();cursorCall.close();}Log.i("Launcher-","getMissCallCount  missCallCount = " + missCallCount);return missCallCount;
}

设置 ICON 未读数

/**** @param flag 更新电话或短信 ICON* @param missCount 未读数
*/
private void setMmsOrPhoneNum(final String flag, final int missCount) {Log.i("Launcher-","flag = "+flag +" missCount = "+missCount);if(mWorkspace == null) return;ArrayList<CellLayout> cellLayouts = mWorkspace.getWorkspaceAndHotseatCellLayouts();for (final CellLayout layoutParent: cellLayouts) {final ViewGroup shortcutAndWidgetContainer = layoutParent.getShortcutsAndWidgets();mWorkspace.post(new Runnable() {public void run() {int childCount = shortcutAndWidgetContainer.getChildCount();for (int j = 0; j <childCount; j++) {View view = shortcutAndWidgetContainer.getChildAt(j);Object tag = view.getTag();if (tag instanceof ShortcutInfo) {final ShortcutInfo info = (ShortcutInfo) tag;final Intent intent = info.intent;if (intent != null) {final ComponentName name = intent.getComponent();if (name != null && name.getClassName().equals(flag)) {BubbleTextView bv = (BubbleTextView) view;Bitmap defaultIconBitmap = Bitmap.createBitmap(info.getIcon(mIconCache));Bitmap bitmap = Utilities.createIconBitmap(defaultIconBitmap, missCount);bv.setCompoundDrawablesWithIntrinsicBounds(null,new FastBitmapDrawable(bitmap),null, null);}}}}}});}
}

第一次启动 Launcher 就能获取未读数目，在 finishBindingItems() 添加逻辑

//ADD BY Bruce Yang
int missCall = getMissCallCount();
int missMms = getMissMmsCount();
if(missCall != 0) {setMmsOrPhoneNum(PHONE_ICON_NAME, missCall);
}
if(missMms != 0) {setMmsOrPhoneNum(MMS_ICON_NAME, missMms);
}

在 onDestroy() 中反注册 ContentObserver

getContentResolver().unregisterContentObserver(smsContentObserver);
getContentResolver().unregisterContentObserver(callContentObserver);

2. Utilities.java

新增构造方法，用于重新绘制带数字的应用图标。

//add by Bruce Yang for ...
static Bitmap createIconBitmap(Bitmap b, int count) {Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888,true);Log.i("Launcher-","b.isMutable() = "+b.isMutable()); // 如果为 false 就会抛出 java.lang.IllegalStateException 异常， http://bbs.csdn.net/topics/370021698if (count == 0) return b;int textureWidth = bitmap.getWidth();final Canvas canvas = sCanvas;Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);canvas.setBitmap(bitmap);paint.setColor(Color.RED);canvas.drawCircle(textureWidth - 17-6, 16+6, 16+6, paint);paint.setColor(Color.WHITE);paint.setStyle(Paint.Style.STROKE);paint.setStrokeWidth(2);canvas.drawCircle(textureWidth - 17-6, 16+6, 16+6, paint);Paint countPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);countPaint.setColor(Color.WHITE);countPaint.setTextSize(26f);countPaint.setTypeface(Typeface.DEFAULT_BOLD);float x = textureWidth - 24-4;if (count > 9) x -= 4+6;if (count > 99) {countPaint.setTextSize(22f);String text = String.valueOf(99) + "+";canvas.drawText(text, x-2, 25+5, countPaint);} else {String text = String.valueOf(count);canvas.drawText(text,x, 25+5, countPaint);}return bitmap;
}

3. AndroidManifest.xml

添加如下两个权限，由于 Android 6.0 以上需要动态权限申请，这里为了直接获取权限，可以将 targetSdkVersion 改成 21（原来是 23）。

<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.READ_CALL_LOG" />

4. 修改对比

修改前：

修改后：

参考文章：

http://blog.csdn.net/chenxiong668/article/details/12851357
http://blog.csdn.net/kerancsdn/article/details/26705767