漫谈anroid软件设计中的contentprovider及其应用

int

delete

(Uri url, String where, String[] selectionArgs)

删除指定

Uri

并且符合一定条件的数据，返回所影响的行数

ContentProvider

ContentProvider

操作数据库不再使用标准的SQL

语言。select,add, delete, modify

等操作被转化为一种特殊的URI

来进行，

这种URI

由3

个部分组成，“content://”,

代表数据的路径，和一个可选的标识数据的ID

。 这种查询字符串格式很常见，

我会在随后的ＵＲＩ介绍中对其说明，android

调用第三方应用也会使用URI

。Android

在android.provider

包下提供一系列的帮助类，

里面包含了很多以类变量形式给出的查询字符串，比如比较老的联系人操作集中在

android.provider.Contacts

类中，

而新版本可以在android.provider

.

ContactsContract

类中得到。

通用资源标志符uri是UniversalResource Identifier的英文缩写，

Android上可用的每种资源-图像、视频片段等都可以用Uri来表示。

 Uri uri = Uri.parse("content://" + "com.yfz.Lesson" + "/people");
intmatch = matcher.match(uri);
switch (match)
{
case PEOPLE:
return "vnd.android.cursor.dir/people";
case PEOPLE_ID:
return "vnd.android.cursor.item/people";
default:
return null;
}  

public class MainActivity extends Activity {
private Mylayout ml = null;
String mcallstr, msmsstr;
intmcallcount, msmscount;
final static intMSG_NEW_SMS_COUNT = 2;
final static intMSG_NEW_CALL_COUNT = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,
WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
mcallstr = "未接电话：";
msmsstr = "未读短信：";
mcallcount = findMissedCallCount();
msmscount = findNewSmsCount() + findNewMmsCount();
// setContentView(R.layout.activity_main);
ml = new Mylayout(this);
ml.setBackgroundColor(Color.BLACK);
ml.setLayoutParams(new RelativeLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
setContentView(ml);

Intent mService = new Intent(MainActivity.this, MyhallServer.class);// ��������
mService.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startService(mService);
((myapp) this.getApplication()).setact(MainActivity.this);

getApplicationContext().getContentResolver().registerContentObserver(
Uri.parse("content://mms-sms/"), true,
new newMmsContentObserver(getApplicationContext(), myHandler));
getApplicationContext().getContentResolver().registerContentObserver(
android.provider.CallLog.Calls.CONTENT_URI, /*
* content://call_log
* /calls
*/
true,
new MissedCallContentObserver(getApplicationContext(),
myHandler));
}

@Override
protected void onDestroy() {
// TODO Auto-generated method stub
getContentResolver().unregisterContentObserver(
new newMmsContentObserver(this, myHandler));
getContentResolver().unregisterContentObserver(
new MissedCallContentObserver(this, myHandler));
super.onDestroy();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

// 通过ＨＡＮＤＬＥＲ修改电话短信条数
private Handler myHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_NEW_SMS_COUNT:
intsms = (Integer) msg.obj;
Log.i("@@@@@", "msg.obj = " + msg.obj.toString());
Log.i("@@@@@", "sms = " + sms);
msmscount = sms;
break;
case MSG_NEW_CALL_COUNT:
intcall = (Integer) msg.obj;
Log.i("@@@@@", "msg.obj = " + msg.obj.toString());
Log.i("@@@@@", "call = " + call);
mcallcount = call;
break;
default:
break;
}
}
};

// 监控短信，彩信数目变化
private intfindNewSmsCount() {
Cursor csr = null;
intnewSmsCount = 0;
try {
csr = getApplicationContext().getContentResolver().query(
Uri.parse("content://sms"), null, "type = 1 and read = 0",
null, null);
newSmsCount = csr.getCount(); // 未读短信数目
} catch (Exception e) {
e.printStackTrace();
} finally {
if (csr != null)
csr.close();
}
return newSmsCount;
}

// 监控短信，短信数目变化
private intfindNewMmsCount() {
Cursor csr = null;
intnewMmsCount = 0;
try {
csr = getApplicationContext().getContentResolver().query(
Uri.parse("content://mms/inbox"), null, "read = 0", null,
null);
newMmsCount = csr.getCount();// 未读彩信数目
} catch (Exception e) {
e.printStackTrace();
} finally {
if (csr != null)
csr.close();
}
return newMmsCount;
}

// 监控电话数目
private intfindMissedCallCount() {
intmissedCallCount = 0;
/*
* Cursor csr = getContentResolver().query(Calls.CONTENT_URI, new
* String[] { Calls.NUMBER, Calls.TYPE, Calls.NEW }, null, null,
* Calls.DEFAULT_SORT_ORDER);
*
* if (csr != null) { if (csr.moveToFirst()) { inttype =
* csr.getInt(csr.getColumnIndex(Calls.TYPE)); switch (type) { case
* Calls.MISSED_TYPE: if (csr.getInt(csr.getColumnIndex(Calls.NEW)) ==
* 1) { missedCallCount = csr.getCount(); }
*
* break; case Calls.INCOMING_TYPE: break; case Calls.OUTGOING_TYPE:
* break; default: break; } } // release resource csr.close(); }
*/

StringBuilder where = new StringBuilder("type = ");
where.append(Calls.MISSED_TYPE);
where.append(" AND new = 1");

// start the query
Cursor cur = null;
try {
cur = this.getContentResolver().query(Calls.CONTENT_URI,
new String[] { Calls._ID }, where.toString(), null,
Calls.DEFAULT_SORT_ORDER);

if (cur != null) {
missedCallCount = cur.getCount();
}
} catch (Exception ex) {
} finally {
if (cur != null) {
cur.close();
}
}

return missedCallCount;
}

// 监控信息数据库
public class newMmsContentObserver extends ContentObserver {
private Context ctx;
private Handler m_handler;
intnewMmsCount = 0;
intnewSmsCount = 0;

public newMmsContentObserver(Context context, Handler handler) {
super(handler);
ctx = context;
m_handler = handler;
}

@Override
public void onChange(boolean selfChange) {
newMmsCount = findNewSmsCount();
newSmsCount = findNewMmsCount();
Log.i("@@@@@", "newSmsCount = " + (newSmsCount + newMmsCount));
m_handler.obtainMessage(MSG_NEW_SMS_COUNT,
(newMmsCount + newSmsCount)).sendToTarget();
}
}

// 监控电话数据库
public class MissedCallContentObserver extends ContentObserver {

private Context ctx;
intmissedCallCount = 0;
private Handler m_handler;
private static final String TAG = "MissedCallContentObserver";

public MissedCallContentObserver(Context context, Handler handler) {
super(handler);
ctx = context;
m_handler = handler;
}

@Override
public void onChange(boolean selfChange) {
missedCallCount = findMissedCallCount();
Log.i("@@@@@", "missedCallCount = " + missedCallCount);
m_handler.obtainMessage(MSG_NEW_CALL_COUNT, missedCallCount)
.sendToTarget();

}
}

public class Mylayout extends View {
Context mContext = null;

Bitmap tmpBitmap = null;
boolean IMG_ENABLE = false;
intw, h;
Bitmap[] BmWeek = null;
Bitmap[] BmTime = null;
Bitmap[] BmDate = null;

public Mylayout(Context context, AttributeSet attrs, intdefStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
mContext = context;

WindowManager wManager = (WindowManager) mContext
.getSystemService(Context.WINDOW_SERVICE);
Display display = wManager.getDefaultDisplay();
w = display.getWidth();
h = display.getHeight();
tmpBitmap = Bitmap.createBitmap(w, h, Config.ARGB_8888);
}

public Mylayout(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
mContext = context;

WindowManager wManager = (WindowManager) mContext
.getSystemService(Context.WINDOW_SERVICE);
Display display = wManager.getDefaultDisplay();
w = display.getWidth();
h = display.getHeight();

tmpBitmap = Bitmap.createBitmap(w, h, Config.ARGB_8888);

}

public Mylayout(Context context) {
super(context);
// TODO Auto-generated constructor stub
mContext = context;

WindowManager wManager = (WindowManager) mContext
.getSystemService(Context.WINDOW_SERVICE);
Display display = wManager.getDefaultDisplay();
w = display.getWidth();
h = display.getHeight();
try {
tmpBitmap = Bitmap.createBitmap(w, h, Config.ARGB_8888);
} catch (OutOfMemoryError e) {
e.printStackTrace();
tmpBitmap.recycle();
System.gc();
System.runFinalization();
tmpBitmap = Bitmap.createBitmap(w, h, Config.ARGB_8888);
}

}

@Override
protected void onLayout(boolean changed, intl, intt, intr, intb) {
// TODO Auto-generated method stub
super.onLayout(changed, l, t, r, b);

}

@Override
protected void onMeasure(intwidthMeasureSpec, intheightMeasureSpec) {
// TODO Auto-generated method stub
super.onMeasure(widthMeasureSpec, heightMeasureSpec);

}

@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub5
super.onDraw(canvas);
Canvas tmpCanvas = new Canvas();
tmpCanvas.setBitmap(tmpBitmap);
Paintp1 = new Paint();
p1.setColor(Color.BLACK);
p1.setStyle(Style.FILL);
tmpCanvas.drawRect(0, 0, w, h, p1);
// 设置字体
if (!IMG_ENABLE) {
Paintp = new Paint();
p.setColor(Color.WHITE);
p.setAntiAlias(true);
p.setStrokeWidth(1);
p.setStyle(Style.FILL);
p.setTextSize(26);
Typeface font = Typeface.create("黑体", Typeface.BOLD);
p.setTypeface(font);

// 显示时间
p.setTextSize(80);
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
String time = sdf.format(new Date());
time = time.substring(0, time.length() - 3);
intfw = (int) p.measureText(time);
FontMetrics fm = p.getFontMetrics();
intfh = (int) Math.ceil(fm.descent - fm.top) + 2;
tmpCanvas.drawText(time, (w - fw) / 2, 200, p);
p.measureText(time);
// 显示星期
sdf = new SimpleDateFormat("EEEE");
String week = sdf.format(new Date());
// tmpCanvas.drawText(week, 100, 200, p);
// 显示日期
p.setTextSize(30);
sdf = new SimpleDateFormat("yyyy-MM-dd");
String date = sdf.format(new Date());
date = date.substring(5, date.length());
date = date + "," + week;
fw = (int) p.measureText(date);
tmpCanvas.drawText(date, (w - fw) / 2, 200 + 50, p);

// 显示未接电话
// fw = (int) p.measureText(time);
// FontMetrics fm = p.getFontMetrics();
// fh = (int)Math.ceil(fm.descent - fm.top) + 2;
tmpCanvas.drawText(mcallstr + String.valueOf(mcallcount),
(w - fw) / 2, 300, p);
// 显示未读短信
tmpCanvas.drawText(msmsstr + String.valueOf(msmscount),
(w - fw) / 2, 350, p);
} else {
drawDate(tmpCanvas, 100, 500);
drawTime(tmpCanvas, 100, 400);
drawWeek(tmpCanvas, 300, 500);
}

canvas.drawBitmap(tmpBitmap, 0, 0, null);
this.invalidate();
}

public void drawDate(Canvas canvas, intx, inty) {

Bitmap bm = null;
int[] imgIds = { R.drawable.r011, R.drawable.r111, R.drawable.r211,
R.drawable.r311, R.drawable.r411, R.drawable.r511,
R.drawable.r611, R.drawable.r711, R.drawable.r811,
R.drawable.r911, R.drawable.hy11, R.drawable.h711, };
intpos = x;
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String date = sdf.format(new Date());
date = date.substring(5, date.length());
// canvas.drawText(date, x, y, null);

for (inti = 0; i < date.length(); i++) {

if (date.charAt(i) == '-') {
bm = BitmapFactory.decodeResource(mContext.getResources(),
imgIds[10]);
} else {
bm = BitmapFactory.decodeResource(mContext.getResources(),
imgIds[date.charAt(i) - '0']);
}
canvas.drawBitmap(bm, pos, y, null);
pos += bm.getWidth();
}
bm = BitmapFactory.decodeResource(mContext.getResources(),
imgIds[11]);
canvas.drawBitmap(bm, pos, y, null);

}

public void drawTime(Canvas canvas, intx, inty) {
Bitmap bm = null;
/*
* int[] imgIds = {R.drawable.time_011, R.drawable.time_111,
* R.drawable.time_211, R.drawable.time_311, R.drawable.time_411,
* R.drawable.time_511, R.drawable.time_611, R.drawable.time_711,
* R.drawable.time_811, R.drawable.time_911, R.drawable.maohao11 };
*/
int[] imgIds = { R.drawable.time_0, R.drawable.time_1,
R.drawable.time_2, R.drawable.time_3, R.drawable.time_4,
R.drawable.time_5, R.drawable.time_6, R.drawable.time_7,
R.drawable.time_8, R.drawable.time_9, R.drawable.time_dot };

intpos = x;

SimpleDateFormat sdf = new SimpleDateFormat("HH-mm-ss");
String time = sdf.format(new Date());
time = time.substring(0, time.length() - 3);
// canvas.drawText(time, x, y, null);
for (inti = 0; i < time.length(); i++) {

if (time.charAt(i) == '-') {
bm = BitmapFactory.decodeResource(mContext.getResources(),
imgIds[10]);
} else {
bm = BitmapFactory.decodeResource(mContext.getResources(),
imgIds[time.charAt(i) - '0']);
}
canvas.drawBitmap(bm, pos, y, null);
pos += bm.getWidth();
}

}

public void drawWeek(Canvas canvas, intx, inty) {
Bitmap bm = null;
String[] weeks = { "星期一", "星期二", "星期三", "星期四", "星期五", "星期六", "星期日" };
int[] imgIds = { R.drawable.time_011, R.drawable.h211,
R.drawable.h311, R.drawable.h411, R.drawable.h511,
R.drawable.h611, R.drawable.h711, R.drawable.hxq11 };
intpos = x;
SimpleDateFormat sdf = new SimpleDateFormat("EEEE");
String week = sdf.format(new Date());
// canvas.drawText(week, x, y, null);
bm = BitmapFactory.decodeResource(mContext.getResources(),
R.drawable.hxq11);
canvas.drawBitmap(bm, pos, y, null);
pos += bm.getWidth();

for (inti = 0; i < weeks.length; i++) {
if (weeks[i].equals(week)) {
bm = BitmapFactory.decodeResource(mContext.getResources(),
imgIds[i]);
canvas.drawBitmap(bm, pos, y, null);
break;
}
}
}

@Override
public boolean onTouchEvent(MotionEvent event) {
intaction = event.getAction();

switch (action) {
case MotionEvent.ACTION_DOWN:

break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:

break;
case MotionEvent.ACTION_MOVE:

break;
}
return true; // super.onTouchEvent(event);
}
}

}

android 监听SD卡文件变化

参考：

http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2012/0821/367.html

，

http://blog.sina.com.cn/s/blog_821e2bb10100spxv.html

http://www.android-study.com/jichuzhishi/338.html

http://blog.csdn.net/sqk1988/article/details/7756507