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[monilesafe] 08_软件管理——获取可用内部存储空间和SDcard空间大小

From Android 4.0

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// a）rom可用
tv_rom_available.setText(getResources().getString(R.string.internal_storage_available)
        +":"+getAvailableStorage(Environment.getDataDirectory().getAbsolutePath()));
// b）sdcard可用
tv_sdcard_available.setText(getResources().getString(R.string.sdcard_storage_available)
        + "" + getAvailableStorage(Environment.getExternalStorageDirectory().getAbsolutePath()));  
核心代码：