一、擷取已經安裝APK的路徑
PackageManager pm = getPackageManager();
for (ApplicationInfo app : pm.getInstalledApplications(0)) {
Log.d("PackageList", "package: " + app.packageName + ", sourceDir: " + app.sourceDir);
}
輸出如下:
package: com.tmobile.thememanager, sourceDir: /system/app/ThemeManager.apk
package: com.touchtype.swiftkey, sourceDir: /data/app/com.touchtype.swiftkey-1.apk
二、 多程序Preferences資料共享
public static void putStringProcess(Context ctx, String key, String value) {
SharedPreferences sharedPreferences = ctx.getSharedPreferences("preference_mu", Context.MODE_MULTI_PROCESS);
Editor editor = sharedPreferences.edit();
editor.putString(key, value);
editor.commit();
}
public static String getStringProcess(Context ctx, String key, String defValue) {
return sharedPreferences.getString(key, defValue);
@SuppressWarnings("unchecked")
public static <T> T[] toArray(Class<?> cls, ArrayList<T> items) {
if (items == null || items.size() == 0) {
return (T[]) Array.newInstance(cls, 0);
}
return items.toArray((T[]) Array.newInstance(cls, items.size()));
private void saveCurrentPosition() {
if (mListView != null) {
int position = mListView.getFirstVisiblePosition();
View v = mListView.getChildAt(0);
int top = (v == null) ? 0 : v.getTop();
//儲存position和top
private void restorePosition() {
if (mFolder != null && mListView != null) {
int position = 0;//取出儲存的資料
int top = 0;//取出儲存的資料
mListView.setSelectionFromTop(position, top);
public static Intent getHotspotSetting() {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_MAIN);
ComponentName com = new ComponentName("com.android.settings", "com.android.settings.TetherSettings");
intent.setComponent(com);
return intent;
public static String getIp(Context ctx) {
return Formatter.formatIpAddress((WifiManager) ctx.getSystemService(Context.WIFI_SERVICE).getConnectionInfo().getIpAddress());
public static void sortFiles(File[] files) {
Arrays.sort(files, new Comparator<File>() {
@Override
public int compare(File lhs, File rhs) {
//傳回負數表示o1 小于o2,傳回0 表示o1和o2相等,傳回正數表示o1大于o2。
boolean l1 = lhs.isDirectory();
boolean l2 = rhs.isDirectory();
if (l1 && !l2)
return -1;
else if (!l1 && l2)
return 1;
else {
return lhs.getName().compareTo(rhs.getName());
}
}
});