=图片==========================

bitmap转Byte数组(微信分享就需要用到)

public byte[] bmpToByteArray(final Bitmap bmp, final boolean needRecycle) {
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        bmp.compress(CompressFormat.PNG, 100, output);        if (needRecycle) {
            bmp.recycle();
        }        byte[] result = output.toByteArray();        try {
            output.close();
        } catch (Exception e) {
            e.printStackTrace();
        }        return result;
    }

Resources转Bitmap

public Bitmap loadBitmap(Resources res, int id) {
        BitmapFactory.Options opt = new BitmapFactory.Options();
        opt.inPreferredConfig = Bitmap.Config.RGB_565;
        opt.inPurgeable = true;
        opt.inInputShareable = true;

        InputStream is = res.openRawResource(id);// 获取资源图片
        return BitmapFactory.decodeStream(is, null, opt);
    }

保存图片到SD卡

public void saveBitmapToFile(String url, String filePath) {
        File iconFile = new File(filePath);        if (!iconFile.getParentFile().exists()) {
            iconFile.getParentFile().mkdirs();
        }        if (iconFile.exists() && iconFile.length() > 0) {            return;
        }

        FileOutputStream fos = null;
        InputStream is = null;        try {
            fos = new FileOutputStream(filePath);
            is = new URL(url).openStream();            int data = is.read();            while (data != -1) {
                fos.write(data);
                data = is.read();
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {            try {                if (is != null) {
                    is.close();
                }                if (fos != null) {
                    fos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

=系统==============================

#根据包名打开一个应用程序    public boolean openApp(String packageName) {
        PackageInfo pi = null;        try {
            pi = mPM.getPackageInfo(packageName, 0);
        } catch (NameNotFoundException e) {
            e.printStackTrace();            return false;
        }        if (pi == null) {            return false;
        }

        Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);
        resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);
        resolveIntent.setPackage(pi.packageName);

        List<ResolveInfo> apps = mPM.queryIntentActivities(resolveIntent, 0);

        ResolveInfo ri = null;        try {
            ri = apps.iterator().next();
        } catch (Exception e) {            return true;
        }        if (ri != null) {
            String tmpPackageName = ri.activityInfo.packageName;
            String className = ri.activityInfo.name;

            Intent intent = new Intent(Intent.ACTION_MAIN);
            intent.addCategory(Intent.CATEGORY_LAUNCHER);

            ComponentName cn = new ComponentName(tmpPackageName, className);

            intent.setComponent(cn);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            MarketApplication.getMarketApplicationContext().startActivity(
                    intent);
        } else {            return false;
        }        return true;
    }

判断是否APK是否安装过

public boolean checkApkExist(Context context, String packageName) {        if (packageName == null || "".equals(packageName))            return false;        try {
            ApplicationInfo info = context.getPackageManager()
                    .getApplicationInfo(packageName,
                            PackageManager.GET_UNINSTALLED_PACKAGES);            return true;
        } catch (NameNotFoundException e) {            return false;
        } catch (NullPointerException e) {            return false;
        }
    }

安装APK

    public void installApk(Context context, String strFileAllName) {
        File file = new File(strFileAllName);
        Intent intent = new Intent();
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setAction(Intent.ACTION_VIEW);
        String type = "application/vnd.android.package-archive";
        intent.setDataAndType(Uri.fromFile(file), type);
        context.startActivity(intent);
    }

卸载APK

    public void UninstallApk(Context context, String strPackageName) {
        Uri packageURI = Uri.parse("package:" + strPackageName);
        Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);
        context.startActivity(uninstallIntent);
    }

判断SD卡是否可用

    public boolean CheckSD() {        if (android.os.Environment.getExternalStorageState().equals(
                android.os.Environment.MEDIA_MOUNTED)) {            return true;
        } else {            return false;
        }
    }

创建快捷方式：

    public void createShortCut(Context contxt) {        // if (isInstallShortcut()) {// 如果已经创建了一次就不会再创建了
        // return;
        // }

        Intent sIntent = new Intent(Intent.ACTION_MAIN);
        sIntent.addCategory(Intent.CATEGORY_LAUNCHER);// 加入action,和category之后，程序卸载的时候才会主动将该快捷方式也卸载
        sIntent.setClass(contxt, Login.class);

        Intent installer = new Intent();
        installer.putExtra("duplicate", false);
        installer.putExtra("android.intent.extra.shortcut.INTENT", sIntent);
        installer.putExtra("android.intent.extra.shortcut.NAME", "名字");
        installer.putExtra("android.intent.extra.shortcut.ICON_RESOURCE",
                Intent.ShortcutIconResource
                        .fromContext(contxt, R.drawable.icon));
        installer.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
        contxt.sendBroadcast(installer);
    }

判断快捷方式是否创建：

private boolean isInstallShortcut() {        boolean isInstallShortcut = false;        final ContentResolver cr = MarketApplication
                .getMarketApplicationContext().getContentResolver();
        String AUTHORITY = "com.android.launcher.settings";
        Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY
                + "/favorites?notify=true");

        Cursor c = cr.query(CONTENT_URI,                new String[] { "title", "iconResource" }, "title=?",                new String[] { "名字" }, null);        if (c != null && c.getCount() > 0) {
            isInstallShortcut = true;
        }        if (c != null) {
            c.close();
        }        if (isInstallShortcut) {            return isInstallShortcut;
        }

        AUTHORITY = "com.android.launcher2.settings";
        CONTENT_URI = Uri.parse("content://" + AUTHORITY
                + "/favorites?notify=true");
        c = cr.query(CONTENT_URI, new String[] { "title", "iconResource" },                "title=?", new String[] { "名字" }, null);        if (c != null && c.getCount() > 0) {
            isInstallShortcut = true;
        }        if (c != null) {
            c.close();
        }

        AUTHORITY = "com.baidu.launcher";
        CONTENT_URI = Uri.parse("content://" + AUTHORITY
                + "/favorites?notify=true");
        c = cr.query(CONTENT_URI, new String[] { "title", "iconResource" },                "title=?", new String[] { "名字" }, null);        if (c != null && c.getCount() > 0) {
            isInstallShortcut = true;
        }        if (c != null) {
            c.close();
        }        return isInstallShortcut;
    }

过滤特殊字符：

    private String StringFilter(String str) throws PatternSyntaxException {        // 只允许字母和数字
        // String regEx = "[^a-zA-Z0-9]";
        // 清除掉所有特殊字符
        String regEx = "[`~!@#$%^&*()+=|{}':;',//[//].<>/?~！@#￥%……&*（）——+|{}【】‘；：”“’。，、？]";
        Pattern p = Pattern.compile(regEx);
        Matcher m = p.matcher(str);        return m.replaceAll("").trim();
    }

执行shell语句：

    public int execRootCmdSilent(String cmd) {        int result = -1;
        DataOutputStream dos = null;        try {
            Process p = Runtime.getRuntime().exec("su");
            dos = new DataOutputStream(p.getOutputStream());
            dos.writeBytes(cmd + "n");
            dos.flush();
            dos.writeBytes("exitn");
            dos.flush();
            p.waitFor();
            result = p.exitValue();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {            if (dos != null) {                try {
                    dos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }        return result;
    }

获得文件MD5值：

    public String getFileMD5(File file) {        if (!file.isFile()) {            return null;
        }

        MessageDigest digest = null;
        FileInputStream in = null;        byte buffer[] = new byte[1024];        int len;        try {
            digest = MessageDigest.getInstance("MD5");
            in = new FileInputStream(file);            while ((len = in.read(buffer, 0, 1024)) != -1) {
                digest.update(buffer, 0, len);
            }
        } catch (Exception e) {
            e.printStackTrace();            return null;
        } finally {            if (in != null) {                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        BigInteger bigInt = new BigInteger(1, digest.digest());        return bigInt.toString(16);
    }