概述
转载：Android 编程实用代码大全
http://www.juapk.com/forum.php?mod=viewthread&tid=325&fromuid=263
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String status=Environment.getExternalStorageState();
if
( status.equals ( Enviroment.MEDIA_MOUNTED ) )
{
说明有SD卡插入
}
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2、让某个Activity透明
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OnCreate中不设Layout
this
.setTheme(R.style.Theme_Transparent);
以下是Theme_Transparent的定义（注意[url=http:
//www.juapk.com/thread-325-1-1.html]transparent_bg[/url]是一副透明的图片）
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3、在屏幕元素中设置句柄
使用Activity.findViewById来取得屏幕上的元素的句柄.使用该句柄您可以设置或获取任何该对象外露的值.
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TextView msgTextView = (TextView)findViewById(R.id.msg);
msgTextView.setText(R.string.push_me);
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4、发送短信
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String body=”
this
is mms demo”;
Intent mmsintent =
new
Intent(Intent.ACTION_SENDTO, Uri.fromParts(”smsto”, number,
null
));
mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY, body);
mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE,
true
);
mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT,
true
);
startActivity(mmsintent);
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5、发送彩信
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StringBuilder sb =
new
StringBuilder();
sb.append(”file:
//”);
sb.append(fd.getAbsoluteFile());
Intent intent =
new
Intent(Intent.ACTION_SENDTO, Uri.fromParts(”mmsto”, number,
null
));
// Below extra datas are all optional.
intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_SUBJECT, subject);
intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY, body);
intent.putExtra(Messaging.KEY_ACTION_SENDTO_CONTENT_URI, sb.toString());
intent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE, composeMode);
intent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT, exitOnSent);
startActivity(intent);
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6、显示toast
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Toast.makeText(
this
._getApplicationContext(), R.string._item, Toast.LENGTH_SHORT).show();
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7、发送Mail
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mime = “img/jpg”;
shareIntent.setDataAndType(Uri.fromFile(fd), mime);
shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(fd));
shareIntent.putExtra(Intent.EXTRA_SUBJECT, subject);
shareIntent.putExtra(Intent.EXTRA_TEXT, body);
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8、注册一个BroadcastReceiver
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registerReceiver(mMasterResetReciever,
new
IntentFilter(”OMS.action.MASTERRESET”));
private
BroadcastReceiver mMasterResetReciever =
new
BroadcastReceiver()
{
public
void
onReceive(Context context, Intent intent)
{
String action = intent.getAction();
if
(”oms.action.MASTERRESET”.equals(action) )
{
RecoverDefaultConfig();
}
}
};
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9、定义ContentObserver，监听某个数据表
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private
ContentObserver mDownloadsObserver =
new
DownloadsChangeObserver(Downloads.CONTENT_URI);
private
class
DownloadsChangeObserver
extends
ContentObserver
{
public
DownloadsChangeObserver(Uri uri)
{
super
(
new
Handler());
}
@Override
public
void
onChange(
boolean
selfChange) {}
}
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10、获得 手机UA
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public
String getUserAgent()
{
String user_agent = ProductProperties.get(ProductProperties.USER_AGENT_KEY,
null
);
return
user_agent;
}
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11、清空手机上cookie
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CookieSyncManager.createInstance (getApplicationContext() );
CookieManager.getInstance().removeAllCookie();
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12、建立GPRS连接
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//Dial the GPRS link.
private
boolean
openDataConnection()
{
// Set up data connection.
DataConnection conn = DataConnection.getInstance();
if
( connectMode ==
0
)
{
ret = conn.openConnection ( mContext, “cmwap”,
"cmwap”, "
cmwap” );
}
else
{
ret = conn.openConnection(mContext, “cmnet”,
""
,
""
);
}
}
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13、PreferenceActivity 用法
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public
class
Setting
extends
PreferenceActivity
{
public
void
onCreate ( Bundle savedInstanceState )
{
super
.onCreate ( savedInstanceState );
addPreferencesFromResource ( R.xml.settings );
}
}
[b]Setting.xml: [/b]
Android:key=”seting2″ android:title=”
@string
/seting2″ android:summary=”
@string
/seting2″/> android:key=”seting1″ android:title=”
@string
/seting1″ android:summaryOff=”
@string
/seting1summaryOff android:summaryOn=”
@stringseting1summaryOff
”/>
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14、通过HttpClient从指定server获取数据
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DefaultHttpClient httpClient =
new
DefaultHttpClient();
HttpGet method =
new
HttpGet(“[url=http:
//www.juapk.com/thread-315-1-1.html]http://www.juapk.com/thread-315-1-1.html[/url] ”);
HttpResponse resp;
Reader reader =
null
;
try
{
// AllClientPNames.TIMEOUT
HttpParams params =
new
BasicHttpParams();
params.setIntParameter(AllClientPNames.CONNECTION_TIMEOUT,
10000
);
httpClient.setParams(params);
resp = httpClient.execute(method);
int
status = resp.getStatusLine().getStatusCode();
if
(status != HttpStatus.SC_OK)
{
return
false
;
}
// HttpStatus.SC_OK;
return
true
;
}
catch
(ClientProtocolException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch
(IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
finally
{
if
(reader !=
null
)
try
{
reader.close();
}
catch
(IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
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15、在当前Activity中启动另外一个Activity
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startActivity(
new
Intent(
this
,目标Activity.
class
));
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16、从当前ContentView从查找控件
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(Button)findViewById(R.id.btnAbout)
R.id.btnAbout指控件id。
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17、 获取屏幕宽高
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DisplayMetrics dm =
new
DisplayMetrics();
//获取窗口属性
getWindowManager().getDefaultDisplay().getMetrics(dm);
int
screenWidth = dm.widthPixels;
//320
int
screenHeight = dm.heightPixels;
//480
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18、 无标题栏、全屏
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//无标题栏
requestWindowFeature(Window.FEATURE_NO_TITLE);
//全屏模式
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
注意在setContentView()之前调用，否则无效。
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19、 调用android自带的模块
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a:调用Web浏览器
Uri myBlogUri = Uri.parse(
"http://xxxxx.com"
);
Intent intent =
new
Intent(Intent.ACTION_VIEW, myBlogUri);
b：地图
Uri mapUri = Uri.parse(
"geo:38.899533,-77.036476"
);
Intent intent =
new
Intent(Intent.ACTION_VIEW, mapUri);
c:调拨打电话界面
Uri telUri = Uri.parse(
"tel:100861"
);
Intent intent =
new
Intent(Intent.ACTION_DIAL, telUri);
d:直接拨打电话
Uri callUri = Uri.parse(
"tel:100861"
);
Intent intent =
new
Intent(Intent.ACTION_CALL, callUri);
e:卸载
Uri uninstallUri = Uri.fromParts(
"package"
,
"xxx"
,
null
);
Intent intent =
new
Intent(Intent.ACTION_DELETE, uninstallUri);
f:安装
Uri installUri = Uri.fromParts(
"package"
,
"xxx"
,
null
);
Intent intent =
new
Intent(Intent.ACTION_PACKAGE_ADDED, installUri);
g:播放
Uri playUri = Uri.parse(
"file:///sdcard/download/everything.mp3"
);
Intent intent =
new
Intent(Intent.ACTION_VIEW, playUri);
h:掉用发邮件
Uri emailUri = Uri.parse(
"mailto:xxxx@gmail.com"
);
Intent intent=
new
Intent(Intent.ACTION_SENDTO, emailUri);
i:发邮件
Intent intent =
new
Intent(Intent.ACTION_SEND);
String[] tos = {
"xxxx@gmail.com"
};
String[] ccs = {
"xxxx@gmail.com"
};
intent.putExtra(Intent.EXTRA_EMAIL, tos);
intent.putExtra(Intent.EXTRA_CC, ccs);
intent.putExtra(Intent.EXTRA_TEXT,
"body"
);
intent.putExtra(Intent.EXTRA_SUBJECT,
"subject"
);
intent.setType(
"message/rfc882"
);
Intent.createChooser(intent,
"Choose Email Client"
);
j:发短信
Uri smsUri = Uri.parse(
"tel:100861"
);
Intent intent=
new
Intent(Intent.ACTION_VIEW, smsUri);
intent.putExtra(
"sms_body"
,
"yyyy"
);
intent.setType(
"vnd.android-dir/mms-sms"
);
k:直接发邮件
Uri smsToUri = Uri.parse(
"smsto://100861"
);
Intent intent=
new
Intent(Intent.ACTION_SENDTO, smsToUri);
intent.putExtra(
"sms_body"
,
"yyyy"
);
l:发彩信
Uri mmsUri = Uri.parse(
"content://media/external/images/media/23"
);
Intent intent=
new
Intent(Intent.ACTION_SEND);
intent.putExtra(
"sms_body"
,
"yyyy"
);
intent.putExtra(Intent.EXTRA_STREAM, mmsUri);
intent.setType(
"image/png"
);
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20、 Android中在非UI线程里更新View的不同方法
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Activity.runOnUiThread( Runnable )
View.post( Runnable )
View.postDelayed( Runnable,
long
)
Hanlder
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21、 全屏显示窗口
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requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
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22、 取得屏幕大小
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方法A：
WindowManager windowManager = getWindowManager();
Display display = windowManager.getDefaultDisplay();
hAndW[
0
] = display.getWidth();
hAndW[
1
] = display.getHeight();
方法B：
DisplayMetrics dm =
new
DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
hAndW[
0
] = dm.widthPixels;
hAndW[
1
] = dm.heightPixels;
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23、 调浏览器 载入网址
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Uri uri = Uri.parse(
"http://www.google.com"
);
Intent it =
new
Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
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24、 取得内存大小
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ActivityManager.MemoryInfo outInfo =
new
ActivityManager.MemoryInfo();
activityManager.getMemoryInfo(outInfo);
//可用内存
outInfo.availMem
//是否在低内存状态
outInfo.lowMemory
取得[url=http:
//www.juapk.com/thread-325-1-1.html]ScrollView[/url]的实际高度
scrollview.getHeight()
scrollview.getMeasuredHeight()
scrollview.compute()
scrollview.getLayoutParams().height
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25、 监听App安装/卸载事件
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A.Define a
class
derived from
class
BroadcastReceiver;
B.Register broadcast receiver;
MyBroadcastReceiver myReceiver =
new
MyBroadcastReceiver();
IntentFilter filter =
new
IntentFilter(Intent.ACTION_PACKAGE_INSTALL);
filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
filter.addAction(Intent.ACTION_PACKAGE_ADDED);
filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
filter.addAction(Intent.ACTION_PACKAGE_RESTARTED);
...
filter.addDataScheme(
"package"
);
//This line is very important. Otherwise, broadcast can't be received.
registerReceiver(myReceiver, filter);
Notes: The
package
name is Intent.mData. Intent.mData is not available in SDK
1.0
, but it can be retrieved by calling Intent.getDataString();
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26、 取得IP地址
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A.
//Connect via WIFI 通过wifi
WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int
ipAddress = wifiInfo.getIpAddress();
B.
//Connect via GPRS通过gprs
public
String getLocalIpAddress(){
try
{
for
(Enumeration en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();){
NetworkInterface intf = en.nextElement();
for
(Enumeration enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();){
InetAddress inetAddress = enumIpAddr.nextElement();
if
(!inetAddress.isLoopbackAddress()){
return
inetAddress.getHostAddress().toString();
}
}
}
}
catch
(SocketException ex){
Log.e(S.TAG, ex.toString());
}
return
null
;
}
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27、 ListView 后面adapter数据已更改，但是ListView没有收到Notification
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首先，必须将 更新adapter数据的代码放在：Handler.post(Runnable)方法中执行；
然后，如果Adapter数据的来源如果是cursor（[url=http:
//www.juapk.com/thread-325-1-1.html]CursorAdapter[/url]）的话 可以cursor.requery一下，如果是别的可以强制调用一下notifyChange, notifyChange 会调用 invalidate 进行重绘；
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28、 模拟HOME键
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Intent i=
new
Intent(Intent.ACTION_MAIN);
i.addCategory(Intent.CATEGORY_HOME);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
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29、 设置焦点
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editText.setFocusable(
true
);
editText.requestFocus();
editText.setFocusableInTouchMode(
true
);
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30、 使用Toast输出一个字符串
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public
void
DisplayToast(String str) {
Toast.makeText(
this
,str,Toast.LENGTH_SHORT).show();
}
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31、 把一个字符串写进文件
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public
void
writefile(String str, String path) {
File file;
FileOutputStream out;
try
{
// 创建文件
file =
new
File(path);
file.createNewFile();
//打开文件file的OutputStream
out =
new
FileOutputStream(file);
String infoToWrite = str;
//将字符串转换成byte数组写入文件
out.write(infoToWrite.getBytes());
//关闭文件file的OutputStream
out.close();
}
catch
(IOException e) {
// 将出错信息打印到Logcat
DisplayToast(e.toString());
}
}
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32、 把文件内容读出到一个字符串
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public
String getinfo(String path) {
File file;
String str=
""
;
FileInputStream in;
try
{
//打开文件file的InputStream
file =
new
File(path);
in =
new
FileInputStream(file);
//将文件内容全部读入到byte数组
int
length = (
int
)file.length();
byte
[] temp =
new
byte
[length];
in.read(temp,
0
, length);
//将byte数组用UTF-8编码并存入display字符串中
str = EncodingUtils.getString(temp,TEXT_ENCODING);
//关闭文件file的InputStream
in.close();
}
catch
(IOException e) {
DisplayToast(e.toString());
}
return
str;
}
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33、 调用Android installer安装和卸载程序
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Intent intent =
new
Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(
new
File(
"/sdcard/WorldCupTimer.apk"
)),
"application/vnd.android.package-archive"
);
startActivity(intent);
//安装 程序
Uri packageURI = Uri.parse(
"package:zy.dnh"
);
Intent uninstallIntent =
new
Intent(Intent.ACTION_DELETE, packageURI);
startActivity(uninstallIntent);
//正常卸载程序
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34、 结束某个进程
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activityManager.restartPackage(packageName);
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35、 设置默认来电铃声
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public
void
setMyRingtone() {
File k =
new
File(
"/sdcard/Shall We Talk.mp3"
);
// 设置歌曲路径
ContentValues values =
new
ContentValues();
values.put(MediaStore.MediaColumns.DATA, k.getAbsolutePath());
values.put(MediaStore.MediaColumns.TITLE,
"Shall We Talk"
);
values.put(MediaStore.MediaColumns.SIZE,
8474325
);
values.put(MediaStore.MediaColumns.MIME_TYPE,
"audio/mp3"
);
values.put(MediaStore.Audio.Media.ARTIST,
"Madonna"
);
values.put(MediaStore.Audio.Media.DURATION,
230
);
values.put(MediaStore.Audio.Media.IS_RINGTONE,
true
);
values.put(MediaStore.Audio.Media.IS_NOTIFICATION,
false
);
values.put(MediaStore.Audio.Media.IS_ALARM,
false
);
values.put(MediaStore.Audio.Media.IS_MUSIC,
false
);
// Insert it into the database
Uri uri = MediaStore.Audio.Media.getContentUriForPath(k.getAbsolutePath());
Uri newUri =
this
.getContentResolver().insert(uri, values);
RingtoneManager.setActualDefaultRingtoneUri(
this
, RingtoneManager.TYPE_RINGTONE, newUri);
}
需要的权限
<uses-permission android:name=
"android.permission.WRITE_SETTINGS"
></uses-permission>
模拟HOME按键
Intent i=
new
Intent(Intent.ACTION_MAIN);
i.addCategory(Intent.CATEGORY_HOME);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
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36、 打开某一个联系人
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Intent intent=
new
Intent();
String data =
"content://contacts/people/1"
;
Uri uri = Uri.parse(data);
intent.setAction(Intent.ACTION_VIEW);
intent.setData(uri);
startActivity(intent);
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37、 发送文件
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void
sendFile(String path) {
File mZipFile=
new
File(path);
Intent intent =
new
Intent(Intent.ACTION_SEND);
// intent.setClassName("com.android.bluetooth", "com.broadcom.bt.app.opp.OppLauncherActivity");
// intent.setClassName("com.android.bluetooth", "com.android.bluetooth.opp.BluetoothOppLauncherActivity");
intent.putExtra(
"subject"
, mZipFile
.getName());
//
intent.putExtra(
"body"
,
"content by chopsticks"
);
// 正文
intent.putExtra(Intent.EXTRA_STREAM,
Uri.fromFile(mZipFile));
// 添加附件，附件为file对象
if
(mZipFile.getName().endsWith(
".gz"
)) {
intent
.setType(
"application/x-gzip"
);
// 如果是gz使用gzip的mime
}
else
if
(mZipFile.getName().endsWith(
".txt"
)) {
intent.setType(
"text/plain"
);
// 纯文本则用text/plain的mime
}
else
if
(mZipFile.getName().endsWith(
".zip"
)) {
intent.setType(
"application/zip"
);
// 纯文本则用text/plain的mime
}
else
{
intent
.setType(
"application/octet-stream"
);
// 其他的均使用流当做二进制数据来发送
}
// startActivity(intent);
startActivity(
Intent.createChooser(intent,
"选择蓝牙客户端"
));
}
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38、 获取正在运行的进程
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在Android中获取系统正在运行的进程方法是getRunningAppProcesses()。我们首先通过ActivityManager _ActivityManager = (ActivityManager)
this
.getSystemService(Context.ACTIVITY_SERVICE);
//来获取系统的全局状态，然后通过调用getRunningAppProcesses()方法就可以获得系统正在运行的进程。
ActivityManager _ActivityManager = (ActivityManager)
this
.getSystemService(Context.ACTIVITY_SERVICE);
List<RunningAppProcessInfo> list = _ActivityManager
.getRunningAppProcesses();
int
i = list.size();
Log.i(
"tag"
, String.valueOf(i));
for
(
int
j =
0
; j < list.size(); j++) {
Log.i(
"tag"
, list.get(j).processName);
}
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39、 Andriod悬浮窗口的实现
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public
class
myFloatView
extends
Activity {
/** Called when the activity is first created. */
@Override
public
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button bb=
new
Button(getApplicationContext());
WindowManager wm=(WindowManager)getApplicationContext().getSystemService("window");
WindowManager.LayoutParams wmParams =
new
WindowManager.LayoutParams();
wmParams.type=
2002
;
//type是关键，这里的2002表示系统级窗口，你也可以试试2003。
wmParams.format=
1
;
wmParams.flags=
40
;
wmParams.width=
40
;
wmParams.height=
40
;
wm.addView(bb, wmParams);
}
}
|
最后
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