Android---常用代碼片段整理
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最近有時間，整理了一下項目中常用到的代碼
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1、圖片旋轉(zhuǎn):
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Bitmap bitmapOrg = BitmapFactory.decodeResource(this.getContext().getResources(), R.drawable.moon);
Matrix matrix = new Matrix();
matrix.postRotate(-90);//旋轉(zhuǎn)的角度
Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,
bitmapOrg.getWidth(), bitmapOrg.getHeight(), matrix, true);
BitmapDrawable bmd = new BitmapDrawable(resizedBitmap);
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2、獲取手機號碼:
//創(chuàng)建電話管理
TelephonyManager tm = (TelephonyManager)
//與手機建立連接
activity.getSystemService(Context.TELEPHONY_SERVICE);
//獲取手機號碼
String phoneId = tm.getLine1Number();
//記得在manifest file中添加
//程序在模擬器上無法實現(xiàn)，必須連接手機
3.格式化string.xml 中的字符串:
// in strings.xml..
Thanks for visiting %s. You age is %d!
// and in the java code:
String.format(getString(R.string.my_text), "oschina", 33);
4、Android設(shè)置全屏的方法:
A.在java代碼中設(shè)置
/** 全屏設(shè)置，隱藏窗口所有裝飾 */
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requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
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B、在AndroidManifest.xml中配置
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<activity android:name=".Login.NetEdit" android:label="@string/label_net_Edit"
android:screenOrientation="portrait" android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen">
<intent-filter>
<action android:name="android.intent.Net_Edit" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
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5、設(shè)置Activity為Dialog的形式:
在AndroidManifest.xml中配置Activity節(jié)點是配置theme如下：
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Android:theme="@android:style/Theme.Dialog"
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6、檢查當(dāng)前網(wǎng)絡(luò)是否連上：
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ConnectivityManager con=(ConnectivityManager)getSystemService(Activity.CONNECTIVITY_SERVICE);
boolean wifi=con.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting();
boolean internet=con.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).isConnectedOrConnecting();
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在AndroidManifest.xml 增加權(quán)限：
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<uses-permission Android:name="android.permission.ACCESS_NETWORK_STATE" />
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7、檢測某個Intent是否有效：
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public static boolean isIntentAvailable(Context context, String action) {
final PackageManager packageManager = context.getPackageManager();
final Intent intent = new Intent(action);
List<ResolveInfo> list =
packageManager.queryIntentActivities(intent,
PackageManager.MATCH_DEFAULT_ONLY);
return list.size() > 0;
}
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8、android 撥打電話：
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try {
Intent intent = new Intent(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:+110"));
startActivity(intent);
} catch (Exception e) {
Log.e("SampleApp", "Failed to invoke call", e);
}
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9、android中發(fā)送Email：
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Intent i = new Intent(Intent.ACTION_SEND);
//i.setType("text/plain"); //模擬器請使用這行
i.setType("message/rfc822") ; // 真機上使用這行
i.putExtra(Intent.EXTRA_EMAIL, new String[]{"test@gmail.com","test@163.com});
i.putExtra(Intent.EXTRA_SUBJECT,"subject goes here");
i.putExtra(Intent.EXTRA_TEXT,"body goes here");
startActivity(Intent.createChooser(i, "Select email application."));
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10、Android中打開瀏覽器：**
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Intent viewIntent = new
Intent("android.intent.action.VIEW",Uri.parse("http://vaiyanzi.cnblogs.com"));
startActivity(viewIntent);
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11、Android 獲取設(shè)備唯一標(biāo)識碼：
String android_id = Secure.getString(getContext().getContentResolver(), Secure.ANDROID_ID);
12、Android中獲取IP地址：
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public String getLocalIpAddress() {
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces();
en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses();
enumIpAddr.hasMoreElements();) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress()) {
return inetAddress.getHostAddress().toString();
}
}
}
} catch (SocketException ex) {
Log.e(LOG_TAG, ex.toString());
}
return null;
}
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13、android獲取存儲卡路徑以及使用情況：
/** 獲取存儲卡路徑 /
File sdcardDir=Environment.getExternalStorageDirectory();
/* StatFs 看文件系統(tǒng)空間使用情況 /
StatFs statFs=new StatFs(sdcardDir.getPath());
/* Block 的 size*/
Long blockSize=statFs.getBlockSize();
/** 總 Block 數(shù)量 /
Long totalBlocks=statFs.getBlockCount();
/* 已使用的 Block 數(shù)量 */
Long availableBlocks=statFs.getAvailableBlocks();
14 android中添加新的聯(lián)系人：
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private Uri insertContact(Context context, String name, String phone) {
ContentValues values = new ContentValues();
values.put(People.NAME, name);
Uri uri = getContentResolver().insert(People.CONTENT_URI, values);
Uri numberUri = Uri.withAppendedPath(uri, People.Phones.CONTENT_DIRECTORY);
values.clear();
values.put(Contacts.Phones.TYPE, People.Phones.TYPE_MOBILE);
values.put(People.NUMBER, phone);
getContentResolver().insert(numberUri, values);
return uri;
}
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15、查看電池使用情況：
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Intent intentBatteryUsage = new Intent(Intent.ACTION_POWER_USAGE_SUMMARY);
startActivity(intentBatteryUsage);
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16、從res/raw打開文件
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public static String openFileFromRaw(Context context) throws IOException {
String content = "";
InputStream inputStream = context.getResources().openRawResource(R.raw.provinces);
if (inputStream != null) {
BufferedReader buffreader = new BufferedReader(new InputStreamReader(inputStream));
String line;
//分行讀取
try {
while ((line = buffreader.readLine()) != null) {
content += line + "n";
}
} catch (IOException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
inputStream.close();
}
return content ;
}
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17 得到屏幕尺寸
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Display display = getWindowManager().getDefaultDisplay();
int width = display.getWidth(); //寬
int height = display.getHeight(); //高
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18 關(guān)閉軟鍵盤
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private void hideSoftInput() {
InputMethodManager imm = (InputMethodManager) this
.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
}
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19 回退按鈕
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public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
new AlertDialog.Builder(activity_login.this)
.setTitle("退出系統(tǒng)")
.setMessage("確定要退出系統(tǒng)嗎")
.setPositiveButton("退出",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
finish();
}
})
// Leave
.setNegativeButton("取消",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
dialog.cancel();
}
}).show();
}
return false;
}
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20 btn_selector
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<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas./apk/res/android">
<!-- pressed -->
<item android:state_pressed="true" android:drawable="@drawable/btn_press"/>
<!-- focused -->
<item android:state_focused="true" android:drawable="@drawable/btn"/>
<!-- default -->
<item android:drawable="@drawable/btn"/>
</selector>
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21 關(guān)閉游標(biāo)和數(shù)據(jù)庫
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private void close(Cursor cursor, SQLiteDatabase database)
{
try
{
if (cursor != null && !cursor.isClosed())
{
cursor.close();
}
}
catch (Exception e)
{}
try
{
dbHelper.closeDb(database);
}
catch (Exception e)
{
}
}
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22 MD5加密
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public static String md5(String string) {
byte[] hash;
try {
hash = MessageDigest.getInstance("MD5").digest(string.getBytes("UTF-8"));
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("Huh, MD5 should be supported?", e);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("Huh, UTF-8 should be supported?", e);
}
StringBuilder hex = new StringBuilder(hash.length * 2);
for (byte b : hash) {
if ((b & 0xFF) < 0x10) hex.append("0");
hex.append(Integer.toHexString(b & 0xFF));
}
return hex.toString().toLowerCase();
}
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23、系統(tǒng)的版本信息
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public String[] getVersion(){
String[] version={"null","null","null","null"};
String str1 = "/proc/version";
String str2;
String[] arrayOfString;
try {
FileReader localFileReader = new FileReader(str1);
BufferedReader localBufferedReader = new BufferedReader(
localFileReader, 8192);
str2 = localBufferedReader.readLine();
arrayOfString = str2.split("\s+");
version[0]=arrayOfString[2];//KernelVersion
localBufferedReader.close();
} catch (IOException e) {
}
version[1] = Build.VERSION.RELEASE;// firmware version
version[2]=Build.MODEL;//model
version[3]=Build.DISPLAY;//system version
return version;
}
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24、mac地址和開機時間
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public String[] getOtherInfo(){
String[] other={"null","null"};
WifiManager wifiManager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
if(wifiInfo.getMacAddress()!=null){
other[0]=wifiInfo.getMacAddress();
} else {
other[0] = "Fail";
}
other[1] = getTimes();
return other;
}
private String getTimes() {
long ut = SystemClock.elapsedRealtime() / 1000;
if (ut == 0) {
ut = 1;
}
int m = (int) ((ut / 60) % 60);
int h = (int) ((ut / 3600));
return h + " " + mContext.getString(R.string.info_times_hour) + m + " "
+ mContext.getString(R.string.info_times_minute);
}
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25、CPU頻率，CPU信息：/proc/cpuinfo和/proc/stat
通過讀取文件/proc/cpuinfo系統(tǒng)CPU的類型等多種信息。
讀取/proc/stat 所有CPU活動的信息來計算CPU使用率
下面我們就來講講如何通過代碼來獲取CPU頻率：
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package com.orange.cpu;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
public class CpuManager {
** // 獲取CPU最大頻率（單位KHZ）
// "/system/bin/cat" 命令行
// "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq" 存儲最大頻率的文件的路徑**
public static String getMaxCpuFreq() {
String result = "";
ProcessBuilder cmd;
try {
String[] args = { "/system/bin/cat",
"/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq" };
cmd = new ProcessBuilder(args);
Process process = cmd.start();
InputStream in = process.getInputStream();
byte[] re = new byte[24];
while (in.read(re) != -1) {
result = result + new String(re);
}
in.close();
} catch (IOException ex) {
ex.printStackTrace();
result = "N/A";
}
return result.trim();
}
**// 獲取CPU最小頻率（單位KHZ）**
public static String getMinCpuFreq() {
String result = "";
ProcessBuilder cmd;
try {
String[] args = { "/system/bin/cat",
"/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq" };
cmd = new ProcessBuilder(args);
Process process = cmd.start();
InputStream in = process.getInputStream();
byte[] re = new byte[24];
while (in.read(re) != -1) {
result = result + new String(re);
}
in.close();
} catch (IOException ex) {
ex.printStackTrace();
result = "N/A";
}
return result.trim();
}
**// 實時獲取CPU當(dāng)前頻率（單位KHZ）**
public static String getCurCpuFreq() {
String result = "N/A";
try {
FileReader fr = new FileReader(
"/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq");
BufferedReader br = new BufferedReader(fr);
String text = br.readLine();
result = text.trim();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
** // 獲取CPU名字**
public static String getCpuName() {
try {
FileReader fr = new FileReader("/proc/cpuinfo");
BufferedReader br = new BufferedReader(fr);
String text = br.readLine();
String[] array = text.split(":\s+", 2);
for (int i = 0; i < array.length; i++) {
}
return array[1];
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
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26、內(nèi)存：/proc/meminfo
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public void getTotalMemory() {
String str1 = "/proc/meminfo";
String str2="";
try {
FileReader fr = new FileReader(str1);
BufferedReader localBufferedReader = new BufferedReader(fr, 8192);
while ((str2 = localBufferedReader.readLine()) != null) {
Log.i(TAG, "---" + str2);
}
} catch (IOException e) {
}
}
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